Connection, light-emitting device and lighting device

Abstract

Compound represented by formula (G1): wherein A1 and A2 each independently represent a substituted or unsubstituted condensed aromatic ring with 10 to 30 carbon atoms, a substituted or unsubstituted condensed heteroaromatic ring with 3 to 30 carbon atoms, or a structure represented by formula (Z-1) or formula (Z-2); wherein Z1 and Z2 each independently have a structure represented by formula (Z-1) or (Z-2); wherein X1 and X2 each independently represent an alkyl group with 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group with 3 to 10 carbon atoms, a cycloalkyl group with a bridge structure and with 7 to 10 carbon atoms, or a trialkylsilyl group with 3 to 12 carbon atoms.wherein Ar1 and Ar2 each independently represent a substituted aromatic hydrocarbon group with 6 to 13 carbon atoms, wherein the substituent of the substituted aromatic hydrocarbon group of Ar1 and Ar2 is each represented by an alkyl group with 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group with 3 to 10 carbon atoms, a cycloalkyl group with a bridge structure and with 7 to 10 carbon atoms, or a trialkylsilyl group with 3 to 12 carbon atoms, wherein R1 to R16 each independently represent hydrogen, an alkyl group with 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group with 3 to 10 carbon atoms, a trialkylsilyl group with 3 to 12 carbon atoms, or a substituted or unsubstituted aryl group with 6 to 25 Represent carbon atoms,wherein at least one of R1 to R5 represents an alkyl group with 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group with 3 to 10 carbon atoms, a trialkylsilyl group with 3 to 12 carbon atoms, or a substituted or unsubstituted aryl group with 6 to 25 carbon atoms, and wherein at least one of R6 to R10 represents an alkyl group with 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group with 3 to 10 carbon atoms, a trialkylsilyl group with 3 to 12 carbon atoms, or a substituted or unsubstituted aryl group with 6 to 25 carbon atoms.

Description

Background of the invention 1. Field of the invention One embodiment of the present invention relates to a compound, a light-emitting device and a lighting device. 2. Description of the state of the art In recent years, research and development of light-emitting devices that utilize electroluminescence (EL) have been actively pursued. Such a light-emitting device has a structure in which an EL layer (containing a light-emitting substance) is positioned between a pair of electrodes. In a light-emitting device, a voltage applied between the electrode pair causes recombination of electrons and holes injected by the electrodes within the EL layer, exciting the light-emitting substance (an organic compound) contained in the EL layer. Light is emitted when the light-emitting substance returns from the excited state to its ground state. The excited state can be a singlet excitation state (S*) or a triplet excitation state (T*).Light emission from a singlet excitation state is called fluorescence, and light emission from a triplet excitation state is called phosphorescence. The statistical generation ratio for a light-emitting device is assumed to be S*:T* = 1:3. Therefore, light-emitting devices containing a phosphorescent substance capable of converting triplet excitation energy into light emission have been actively researched and developed in recent years to achieve high efficiency. In addition to phosphorescent substances, thermally activated delayed fluorescent (TADF) materials are known to convert triplet excitation energy partially or completely into light emission. A TADF material can generate a singlet excitation state from a triplet excitation state through reverse intersystem crossing. A method by which a fluorescent substance efficiently emits light in a light-emitting device containing a TADF material is disclosed by combining the TADF material with a fluorescent substance and transferring the singlet excitation energy of the TADF material to the fluorescent substance (see Patent Document 1 and Non-Patent Document 1). Regarding the energy transfer from a host material to a guest material in a light-emitting layer of a light-emitting device, it is generally preferable to increase the concentration ratio of the guest material (the fluorescent substance) to the host material to improve energy transfer efficiency via the Förster mechanism. However, a trade-off exists: increasing the concentration ratio of the guest material increases the rate of energy transfer via the Dexter mechanism, which reduces emission efficiency. Therefore, increasing the concentration ratio of the guest material is not an effective means of improving emission efficiency. [Reference] [Patent document] [Patent Document 1] Japanese Patent Publication No. 2014-045179 [Non-patent document] [Non-Patent Document 1] Hiroki Noda et al., “SCIENCE ADVANCES”, 2018, Vol. 4, No. 6, eaao6910 . JP 2014-177442 A relates to a diaminoanthracene derivative and an organic electroluminescent element containing the diaminoanthracene derivative. KR 10 2013 0 020 503 A relates to a light-emitting device comprising a first electrode, a second electrode, and an organic film consisting of at least one layer. The organic film comprises an organic light-emitting compound, which is an amine-based derivative with asymmetrically substituted anthracene. WO 2007 / 105917 A1 relates to an anthracene derivative, a process for its preparation, and an organic electronic device using it. The anthracene derivative can serve as a hole injection material, hole transport material, electron injection material, electron transport material, or light-emitting material, in particular as a light-emitting host or dopant. KR 10 2009 0 105 495 A relates to an organic electroluminescent compound which is supplied for the manufacture of an OLED device. US 2005 / 2 260 442 A1 concerns an anthracene compound for an organic electroluminescent device. EP 1775334 A1 and US 2007 / 0087222 A1 relate to an organic electroluminescent device comprising a structure with an anode, an emission layer and a cathode, wherein a fluorescent compound is used as the emission material of the emission layer or as a dopant of the emission layer. Summary of the invention One embodiment of the present invention provides a novel compound. This compound efficiently receives energy from a singlet excitation state (S*) (hereinafter referred to as singlet excitation energy) of a host material, even when the concentration ratio of the host material in an EL layer of a light-emitting device is increased, thereby reducing the probability of energy transfer from a triplet excitation state (T*) (hereinafter referred to as triplet excitation energy) of the host material (energy transfer can be prevented by the Dexter mechanism). Another embodiment of the present invention provides a novel compound that can be used in a light-emitting device. Another embodiment of the present invention provides a novel compound that can be used in an EL layer of a light-emitting device. Another embodiment of the present invention provides a novel light-emitting device with high emission efficiency in which the novel compound of an embodiment of the present invention is used. Another embodiment of the present invention provides a novel lighting device. It should be noted that the description of these problems does not preclude the existence of further problems. An embodiment of the present invention need not necessarily achieve all of these problems. Further problems will become apparent from the explanation of the description, the drawings, the claims, and the like, and can be derived from them. One embodiment of the present invention is a fluorescent substance, which is a compound represented by the formula (G1) below. In formula (G1), A1 and A2 each independently represent a substituted or unsubstituted condensed aromatic ring with 10 to 30 carbon atoms, a substituted or unsubstituted condensed heteroaromatic ring with 3 to 30 carbon atoms, or a structure represented by formula (Z-1) or formula (Z-2). Z1 and Z2 each independently exhibit a structure represented by formula (Z-1) or (Z-2). X1 and X2 each independently represent an alkyl group with 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group with 3 to 10 carbon atoms, a cycloalkyl group with a bridge structure and 7 to 10 carbon atoms, or a trialkylsilyl group with 3 to 12 carbon atoms. Ar1 and Ar2 each independently represent a substituted aromatic hydrocarbon group with 6 to 13 carbon atoms.wherein the substituent of the substituted aromatic hydrocarbon group of Ar1 and Ar2 is represented by an alkyl group with 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group with 3 to 10 carbon atoms, a cycloalkyl group with a bridge structure and with 7 to 10 carbon atoms or a trialkylsilyl group with 3 to 12 carbon atoms. R1 to R16 each independently represent hydrogen, an alkyl group with 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group with 3 to 10 carbon atoms, a trialkylsilyl group with 3 to 12 carbon atoms, or a substituted or unsubstituted aryl group with 6 to 25 carbon atoms, wherein at least one of R1 to R5 is an alkyl group with 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group with 3 to 10 carbon atoms,a trialkylsilyl group with 3 to 12 carbon atoms or a substituted or unsubstituted aryl group with 6 to 25 carbon atoms, and wherein at least one of R6 to R10 represents an alkyl group with 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group with 3 to 10 carbon atoms, a trialkylsilyl group with 3 to 12 carbon atoms, or a substituted or unsubstituted aryl group with 6 to 25 carbon atoms. Preferably, A1 and A2 each independently constitute a substituted or unsubstituted stilbene group, a substituted or unsubstituted acridone group, a substituted or unsubstituted phenoxazine group, a substituted or unsubstituted phenothiazine group, a substituted or unsubstituted anthracene group, a substituted or unsubstituted fluorene group, a substituted or unsubstituted chrysene group, a substituted or unsubstituted triphenylene group, a substituted or unsubstituted tetracene group, a substituted or unsubstituted pyrene group, a substituted or unsubstituted perylene group, a substituted or unsubstituted quinoline group, a substituted or unsubstituted benzimidazole group, a substituted or unsubstituted quinazoline group, a substituted or unsubstituted carbazole group,a substituted or unsubstituted acridine group, a substituted or unsubstituted coumarin group, a substituted or unsubstituted quinacridone group, a substituted or unsubstituted naphthobisbenzofuran group, a substituted or unsubstituted dibenzofuran group, a substituted or unsubstituted dibenzothiophene group, a substituted or unsubstituted indenocarbazole group, a substituted or unsubstituted indolocarbazole group, or a substituted or unsubstituted dibenzocarbazole group. A preferred embodiment of the present invention is a compound represented by the following formula (G2). In formula (G2), B1 and B2 each independently represent a substituted or unsubstituted condensed heteroaromatic ring with 3 to 30 carbon atoms. It should be noted that the substituted or unsubstituted condensed heteroaromatic ring of B1 and B2 in formulas (G1) and (G2) preferably each comprises a pyrrole ring. The condensed heteroaromatic ring comprising a pyrrole ring preferably includes an indole ring, a carbazole ring, an indenocarbazole ring, an indolocarbazole ring, a dibenzocarbazole ring, or the like. A preferred embodiment of the present invention is a compound represented by the following formula (G3). In formula (G3), R17 to R42 each independently represent hydrogen, an alkyl group with 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group with 3 to 10 carbon atoms, a trialkylsilyl group with 3 to 12 carbon atoms, or a substituted or unsubstituted aryl group with 6 to 25 carbon atoms; one of R17 to R29 is bonded to a nitrogen atom that is bonded to Z1, and one of R30 to R42 is bonded to a nitrogen atom that is bonded to Z2. Another preferred embodiment of the present invention is a compound represented by formula (G4). In formula (G4), R17, R19 to R30 and R32 to R42 each independently represent hydrogen, an alkyl group with 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group with 3 to 10 carbon atoms, a trialkylsilyl group with 3 to 12 carbon atoms or a substituted or unsubstituted aryl group with 6 to 25 carbon atoms. Another preferred embodiment of the present invention is a compound represented by the structural formula (100) or (112). Another embodiment of the present invention is a light-emitting device in which the compound of an embodiment of the present invention described above is used. It should be noted that the present invention also includes a light-emitting device in which an EL layer is provided between a pair of electrodes, and a light-emitting layer contained within the EL layer comprises the compound of an embodiment of the present invention. In addition to the light-emitting device mentioned above, the light-emitting device may include a layer (e.g., a cap layer) in contact with an electrode and containing an organic compound.Furthermore, it should be noted that the present invention also comprises a light-emitting device, wherein an EL layer is provided between a pair of electrodes, the EL layer comprising a light-emitting layer, and the light-emitting layer comprising a phosphorescent material and a compound of an embodiment of the present invention. In addition to the light-emitting devices, a light-emitting arrangement comprising a transistor, a substrate, and the like is also disclosed. Furthermore, in addition to the light-emitting arrangement, an electronic device and a lighting device comprising a microphone, a camera, a control button, an external connection section, a housing, a cover, a bracket, a loudspeaker, or the like are also disclosed.Another embodiment of the present invention is a lighting device comprising the light-emitting device according to claim 8; and at least one consisting of a housing, a cover and a support base. Furthermore, the present disclosure includes an embodiment of a light-emitting device comprising a light-emitting apparatus. The light-emitting device in this description therefore refers to an image display device and a light source (including an illumination device). The light-emitting device also includes the following modules in its category: a module in which a connector, such as a flexible printed circuit (FPC) or a tape carrier package (TCP), is attached to a light-emitting device; a module in which a printed circuit board is provided at the end of a TCP; and a module in which an integrated circuit (IC) is directly mounted to a light-emitting device by a chip-on-glass (COG) method. One embodiment of the present invention can provide a novel compound. Another embodiment of the present invention can provide a novel compound that can be used in a light-emitting device. Another embodiment of the present invention can provide a novel compound that can be used in an EL layer of a light-emitting device. Another embodiment of the present invention can provide a light-emitting device with high emission efficiency. Another embodiment of the present invention can provide a very reliable light-emitting device. Another embodiment of the present invention can provide a novel light-emitting device. Another embodiment of the present invention can provide a novel lighting device. It should be noted that the description of these effects does not preclude the existence of further effects. One embodiment of the present invention does not necessarily achieve all of the effects listed above. Further effects will become apparent from the explanations in the description, the drawings, the claims, and the like, and can be derived from them. Brief description of the drawings Fig. 1A represents a structure of a light-emitting device. Fig. 1B represents a light-emitting layer. Fig. 2A is a conceptual representation of the energy transfer between a general guest material and a host material. Fig. 2B is a conceptual representation of the energy transfer between a compound of an embodiment of the present invention (a guest material) and a host material. Figs. 3A to 3C are each a conceptual representation of the energy transfer between compounds in a light-emitting layer. Figs. 4A to 4C are each a conceptual representation of the energy transfer between compounds in a light-emitting layer. Figs. 5A and 5B are each a conceptual representation of the energy transfer between compounds in a light-emitting layer. Figs. 6A and 6B each represent a structure of a light-emitting device.Figures 7A to 7C each represent a light-emitting device. Figure 8A is a top view of a light-emitting device. Figure 8B is a cross-sectional view of the light-emitting device. Figure 9A represents a portable computer. Figure 9B represents a portable image display device. Figure 9C represents a digital camera. Figures 9D and 9E each represent a portable information terminal. Figure 9F represents a television set. Figure 9G represents a portable information terminal. Figures 10A to 10C represent a foldable, portable information terminal. Figures 11A and 11B represent a vehicle. Figure 12 represents a lighting device. Figure 13 represents a lighting device. Figure 14 is a 1H NMR diagram of an organic compound represented by the structural formula (100).Figure 15 shows a UV-VIS absorption spectrum and an emission spectrum of the organic compound represented by structural formula (100). Figure 16 shows a light-emitting device. Figure 17 shows current density-luminance properties of light-emitting devices 1-1 and 1-2, as well as light-emitting comparison devices 1-a and 1-b. Figure 18 shows voltage-luminance properties of light-emitting devices 1-1 and 1-2, as well as light-emitting comparison devices 1-a and 1-b. Figure 19 shows luminance-current efficiency properties of light-emitting devices 1-1 and 1-2, as well as light-emitting comparison devices 1-a and 1-b. Figure 20 shows voltage-current density properties of light-emitting devices 1-1 and 1-2, as well as light-emitting comparison devices 1-a and 1-b.Figure 21 shows luminance-external quantum efficiency properties of light-emitting devices 1-1 and 1-2, as well as light-emitting comparison devices 1-a and 1-b. Figure 22 shows electroluminescence spectra of light-emitting devices 1-1 and 1-2, as well as light-emitting comparison devices 1-a and 1-b. Figure 23 shows results of the reliability tests of light-emitting devices 1-1 and 1-2, as well as light-emitting comparison devices 1-a and 1-b. Detailed description of the invention Embodiments and examples of the present invention are described in detail below with reference to the drawings. It should be noted that the present invention is not limited to the following description and that the modes and details of the present invention can be modified in various ways without departing from the concept and scope of the present invention. Therefore, the present invention should not be considered as limited to the description of the following embodiments and examples. It should be noted that the position, size, area, or the like of each component shown in drawings and the like is, in some cases, not shown precisely for ease of understanding. The disclosed invention is therefore not necessarily limited to the position, size, area, or the like disclosed in the drawings and the like. In the explanation of the structures of the invention in this description and the like, based on the drawings, identical components in different drawings are generally provided with the same reference numeral. In this description and similar passages, a singlet excitation state (S*) denotes a singlet state with excitation energy . An S1 level denotes the lowest level of the singlet excitation energy levels, i.e., the excitation energy level of the lowest singlet excitation state (S1 state). A triplet excitation state (T*) denotes a triplet state with excitation energy . A T1 level denotes the lowest level of the triplet excitation energy levels, i.e., the excitation energy level of the lowest triplet excitation state (T1 state). It should be noted that in this description and similar passages, the simple expressions "singulet excitation state" and "singulet excitation energy level" sometimes refer to the S1 state and the S1 level, respectively. Furthermore, in some cases the terms "triplet excitation state" and "triplet excitation energy level" refer to the T1 state or the T1 level. In this description and similar usage, a fluorescent substance refers to a compound that emits light in the visible or near-infrared range when relaxing from a singlet excitation state to a ground state. A phosphorescent substance refers to a compound that emits light in the visible or near-infrared range at room temperature when relaxing from a triplet excitation state to a ground state. That is, a phosphorescent substance refers to a compound that can convert triplet excitation energy into light emission. (Version 1) This embodiment describes connections between embodiments of the present invention. A connection of an embodiment of the present invention is represented by the following formula (G1). In formula (G1), A1 and A2 each independently represent a substituted or unsubstituted condensed aromatic ring with 10 to 30 carbon atoms, a substituted or unsubstituted condensed heteroaromatic ring with 3 to 30 carbon atoms, or a structure represented by formula (Z-1) or formula (Z-2). Z1 and Z2 each independently exhibit a structure represented by formula (Z-1) or (Z-2). X1 and X2 each independently represent an alkyl group with 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group with 3 to 10 carbon atoms, a cycloalkyl group with a bridge structure and 7 to 10 carbon atoms, or a trialkylsilyl group with 3 to 12 carbon atoms. Ar1 and Ar2 each independently represent a substituted aromatic hydrocarbon group with 6 to 13 carbon atoms.wherein the substituent of the substituted aromatic hydrocarbon group of Ar1 and Ar2 is represented by an alkyl group with 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group with 3 to 10 carbon atoms, a cycloalkyl group with a bridge structure and with 7 to 10 carbon atoms or a trialkylsilyl group with 3 to 12 carbon atoms. R1 to R16 each independently represent hydrogen, an alkyl group with 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group with 3 to 10 carbon atoms, a trialkylsilyl group with 3 to 12 carbon atoms, or a substituted or unsubstituted aryl group with 6 to 25 carbon atoms, wherein at least one of R1 to R5 is an alkyl group with 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group with 3 to 10 carbon atoms,a trialkylsilyl group with 3 to 12 carbon atoms or a substituted or unsubstituted aryl group with 6 to 25 carbon atoms, and wherein at least one of R6 to R10 represents an alkyl group with 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group with 3 to 10 carbon atoms, a trialkylsilyl group with 3 to 12 carbon atoms, or a substituted or unsubstituted aryl group with 6 to 25 carbon atoms. A preferred embodiment of the present invention is a compound represented by the following formula (G2). In formula (G2), B1 and B2 each independently represent a substituted or unsubstituted condensed heteroaromatic ring with 3 to 30 carbon atoms. Each of the condensed heteroaromatic rings represented by A1 and A2 in formula (G1) and B1 and B2 in formula (G2) is preferably a condensed heteroaromatic ring comprising a pyrrole ring. Each of the condensed heteroaromatic rings represented by A1 and A2 in formula (G1) and B1 and B2 in formula (G2) is preferably an indole ring, a carbazole ring, an indenocarbazole ring, an indolocarbazole ring or a dibenzocarbazole ring. A preferred embodiment of the present invention is a compound represented by the following formula (G3). In formula (G3), R17 to R42 each independently represent hydrogen, an alkyl group with 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group with 3 to 10 carbon atoms, a trialkylsilyl group with 3 to 12 carbon atoms, or a substituted or unsubstituted aryl group with 6 to 25 carbon atoms; one of R17 to R29 is bonded to a nitrogen atom that is bonded to Z1, and one of R30 to R42 is bonded to a nitrogen atom that is bonded to Z2. A preferred embodiment of the present invention is a compound represented by formula (G4). In formula (G4), R17, R19 to R30 and R32 to R42 each independently represent hydrogen, an alkyl group with 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group with 3 to 10 carbon atoms, a trialkylsilyl group with 3 to 12 carbon atoms or a substituted or unsubstituted aryl group with 6 to 25 carbon atoms. The compound of one embodiment of the present invention is a material with a function for converting singlet excitation energy into light emission (a fluorescent substance), and therefore it can be used as a guest material in combination with a host material in a light-emitting layer of a light-emitting device. The compound of one embodiment of the present invention has a luminophore that contributes to light emission and a protecting group that prevents the transfer of triplet excitation energy from the host material to the compound via the Dexter mechanism. The luminophore of the compound of one embodiment of the present invention is a condensed aromatic ring or a condensed heteroaromatic ring.The aryl groups in two or more diarylamino groups in the compound of an embodiment of the present invention each have at least two protecting groups; in particular, the protecting group is a cycloalkyl group with a bridge structure and with 7 to 10 carbon atoms, an alkyl group with 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group with 3 to 10 carbon atoms or a trialkylsilyl group with 3 to 12 carbon atoms. It should be noted that the compound of one embodiment of the present invention has a structure in which the two or more diarylamine groups are bonded to the protecting groups on the luminophore in symmetrical positions, thereby increasing the quantum yield. The inclusion of diarylamine groups in the compound of one embodiment of the present invention prevents an increase in molecular weight and maintains sublimation capability. In one embodiment of the present invention, since the protecting group is bonded to the aryl group of the diarylamino group, which is bonded to the luminophore, the protecting group can be arranged to cover the luminophore. The host material and the luminophore can be positioned at such a distance from each other that energy transfer from the host material to the luminophore via the Dexter mechanism is less likely to occur. It should be noted that in formulas (G1) to (G4) examples of the condensed aromatic ring with 10 to 30 carbon atoms or the condensed heteroaromatic ring with 3 to 30 carbon atoms include a phenanthrene ring, a stilbene ring, an acridone ring, a phenoxazine ring and a phenothiazine ring. Furthermore, other examples include a naphthalene ring, an anthracene ring, a fluorene ring, a chrysene ring, a triphenylene ring, a tetracene ring, a pyrene ring, a perylene ring, a quinoline ring, a benzimidazole ring, a quinazoline ring, a carbazole ring, an acridine ring, a coumalin ring, a quinacridone ring, a naphthobisbenzofuran ring, a dibenzofuran ring, a dibenzothiophene ring, an indenocarbazole ring, an indolocarbazole ring and a dibenzocarbazole ring, which can increase the fluorescence quantum yield. It should be noted that in formulas (G1) to (G4) examples of the aromatic hydrocarbon group with 6 to 13 carbon atoms include a phenyl group, a biphenyl group, a naphthyl group and a fluorenyl group. In formulas (G1) to (G4), specific examples of the alkyl group with 3 to 10 carbon atoms include a propyl group, an isopropyl group, a butyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, a pentyl group, a hexyl group, a heptyl group and an octyl group. In formulas (G1) to (G4), specific examples of the cycloalkyl group with 3 to 10 carbon atoms include a cyclopropyl group, a cyclobutyl group, and a cyclohexyl group. In cases where the cycloalkyl group has a substituent, specific examples of the substituent include an alkyl group with 1 to 7 carbon atoms, such as a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, a pentyl group, or a hexyl group; a cycloalkyl group with 5 to 7 carbon atoms, such as... B. a cyclopentyl group, a cyclohexyl group, a cycloheptyl group or an 8,9,10-trinorbornanyl group, and an aryl group with 6 to 12 carbon atoms, such as a phenyl group, a naphthyl group or a biphenyl group. In formulas (G1) to (G4) specific examples of the cycloalkyl group with a bridge structure and with 7 to 10 carbon atoms include an adamantyl group, a bicyclo[2.2.1]heptyl group, a tricyclo[5.2.1.02,6]decanyl group and a noradamantyl group. In formulas (G1) to (G4), specific examples of a trialkylsilyl group with 3 to 12 carbon atoms include a trimethylsilyl group, a triethylsilyl group and a tert-butyldimethylsilyl group. In the case where the condensed aromatic ring, the condensed heteroaromatic ring, the aromatic hydrocarbon group with 6 to 13 carbon atoms, the cycloalkyl group with 3 to 10 carbon atoms, or the alkyl group with 6 to 25 carbon atoms has a substituent in formulas (G1) to (G4), examples of the substituent include an alkyl group with 1 to 7 carbon atoms, such as a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, a pentyl group, or a hexyl group, a cycloalkyl group with 5 to 7 carbon atoms, such as... B. a cyclopentyl group, a cyclohexyl group, a cycloheptyl group or an 8,9,10-trinorbornanyl group, and an aryl group with 6 to 12 carbon atoms, such as a phenyl group, a naphthyl group or a biphenyl group. In formulas (G1) to (G4), specific examples of the aryl group with 6 to 25 carbon atoms include a phenyl group, a naphthyl group, a biphenyl group, a fluorenyl group, and a spirofluorenyl group. It should be noted that in cases where the aryl group has a substituent, examples of the substituent include an alkyl group with 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group with 3 to 10 carbon atoms, and a trialkylsilyl group with 3 to 12 carbon atoms. Specific examples of the compounds represented by formulas (G1) to (G4) are shown in the structural formulas (100), (112) to (115), (120) to (123), (127) to (135), and (137) to (139) below. The compounds of formulas (101) to (111), (116) to (119), (124) to (126), and (136) below are not according to the invention. It should be noted that specific examples of the compounds represented by formulas (G1) to (G4) are not limited to the examples shown below. <Verfahren zum Synthetisieren einer durch die Formel (G1) dargestellten organischen Verbindung> Next, a procedure for synthesizing the compound represented by formula (G1) is described. In formula (G1), A1 and A2 each independently represent a substituted or unsubstituted condensed aromatic ring with 10 to 30 carbon atoms, a substituted or unsubstituted condensed heteroaromatic ring with 3 to 30 carbon atoms, or a structure represented by formula (Z-1) or formula (Z-2). Z1 and Z2 each independently exhibit a structure represented by formula (Z-1) or (Z-2). In formula (Z-1), X1 and X2 each independently represent an alkyl group with 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group with 3 to 10 carbon atoms, a cycloalkyl group with a bridge structure and 7 to 10 carbon atoms, or a trialkylsilyl group with 3 to 12 carbon atoms. Ar1 and Ar2 each independently represent a substituted aromatic hydrocarbon group with 6 to 13 carbon atoms.wherein the substituent of the substituted aromatic hydrocarbon group of Ar1 and Ar2 is represented by an alkyl group with 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group with 3 to 10 carbon atoms, a cycloalkyl group with a bridge structure and with 7 to 10 carbon atoms or a trialkylsilyl group with 3 to 12 carbon atoms. R1 to R16 each independently represent hydrogen, an alkyl group with 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group with 3 to 10 carbon atoms, a trialkylsilyl group with 3 to 12 carbon atoms, or a substituted or unsubstituted aryl group with 6 to 25 carbon atoms, wherein at least one of R1 to R5 is an alkyl group with 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group with 3 to 10 carbon atoms,a trialkylsilyl group with 3 to 12 carbon atoms or a substituted or unsubstituted aryl group with 6 to 25 carbon atoms, and wherein at least one of R6 to R10 represents an alkyl group with 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group with 3 to 10 carbon atoms, a trialkylsilyl group with 3 to 12 carbon atoms, or a substituted or unsubstituted aryl group with 6 to 25 carbon atoms. The compound represented by formula (G1) can be synthesized, for example, by a procedure shown in the synthesis schemes (S-1) and (S-2) below. First, compound 1, compound 2 (aniline compound) and compound 3 (aniline compound) are coupled, resulting in compound 4 (diamine compound) (synthesis scheme (S-1)). Next, compound 4 (diamine compound), compound 5 (halogenated aryl) and compound 6 (halogenated aryl) are coupled, giving the compound represented by formula (G1) (synthesis scheme (S-2)). The compound represented by formula (G1) can also be synthesized by a procedure shown in the synthesis schemes (S-3), (S-4) and (S-5) below. First, compound 2 (aniline compound) and compound 5 (halogenated aryl) are coupled, giving compound 7 (amine compound) (synthesis scheme (S-3)). Compound 3 (aniline compound) and compound 6 (halogenated aryl) are coupled to give compound 8 (amine compound) (synthesis scheme (S-4)). Next, compound 1, compound 7 (amine compound) and compound 8 (amine compound) are coupled, giving the compound represented by formula (G1) (synthesis scheme (S-5)). In synthesis schemes (S-1) to (S-5), A1 and A2 each independently represent a substituted or unsubstituted condensed aromatic ring with 10 to 30 carbon atoms, a substituted or unsubstituted condensed heteroaromatic ring with 3 to 30 carbon atoms, or a structure represented by formula (Z-1) or formula (Z-2). Z1 and Z2 each independently represent a structure represented by formula (Z-1) or (Z-2). X1 and X2 each independently represent an alkyl group with 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group with 3 to 10 carbon atoms,Ar1 and Ar2 each independently represent a substituted aromatic hydrocarbon group with 6 to 13 carbon atoms, wherein the substituent of the substituted aromatic hydrocarbon group of Ar1 and Ar2 is represented by an alkyl group with 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group with 3 to 10 carbon atoms, a cycloalkyl group with a bridge structure and 7 to 10 carbon atoms, or a trialkylsilyl group with 3 to 12 carbon atoms. R1 to R16 each independently represent hydrogen, an alkyl group with 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group with 3 to 10 carbon atoms,a trialkylsilyl group with 3 to 12 carbon atoms or a substituted or unsubstituted aryl group with 6 to 25 carbon atoms, wherein at least one of R1 to R5 represents an alkyl group with 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group with 3 to 10 carbon atoms, a trialkylsilyl group with 3 to 12 carbon atoms, or a substituted or unsubstituted aryl group with 6 to 25 carbon atoms, and wherein at least one of R6 to R10 represents an alkyl group with 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group with 3 to 10 carbon atoms, a trialkylsilyl group with 3 to 12 carbon atoms, or a substituted or unsubstituted aryl group with 6 to 25 carbon atoms. In the case where a Buchwald-Hartwig reaction using a palladium catalyst is applied in synthesis schemes (S-1) to (S-5), X10 to X13 each represent a halogen group or a triflate group. Iodine, bromine, or chlorine are preferred as the halogen. The reaction can employ a palladium compound, such as bis(dibenzylideneacetone)palladium(0) or palladium(II) acetate, and a ligand, such as tri(tert-butyl)phosphine, tri(n-hexyl)phosphine, tricyclohexylphosphine, di(1-adamantyl)-n-butylphosphine, or 2-dicyclohexylphosphino-2',6'-dimethoxy-1,1'-biphenyl. Furthermore, an organic base, such as sodium tert-butoxide, or an inorganic base, such as... Potassium carbonate, cesium carbonate, or sodium carbonate, or similar solvents, may be used. Furthermore, toluene, xylene, mesitylene, benzene, tetrahydrofuran, dioxane, or similar solvents may be used.The reagents that can be used in the reaction are not limited to this. The reaction used in synthesis schemes (S-1) to (S-5) is not limited to the Buchwald-Hartwig reaction. A Migita-Kosugi-Stille coupling reaction using an organotin compound, a coupling reaction using a Grignard reagent, an Ullmann reaction using copper or a copper compound, or the like, can be used. In the case where compound 2 and compound 3 have different structures in the synthesis scheme (S-1), it is preferred that compound 1 and compound 2 react to form a coupling product, and then the coupling product and compound 3 react. In the case where compound 1 reacts with compound 2 and with compound 3 in different phases, it is preferred that compound 1 is a dihalogen compound and that X10 and X11 are different halogens and are selectively subjected to successive amination reactions. In the synthesis scheme (S-2) it is further preferred that compound 4 and compound 5 react to form a coupling product, and then the coupling product and compound 6 react. In the synthesis scheme (S-5) it is preferred that compound 1 and compound 7 react to form a coupling product, and then the coupling product and compound 8 react. The methods for synthesizing the compounds of an embodiment of the present invention have been described above; however, the present invention is not limited thereto and another synthesis method may be used. (Version 2) In this embodiment, examples of light-emitting devices for which a compound of an embodiment of the present invention is preferably used are described. As shown in Fig. 1A, the light-emitting device has a structure in which an EL layer 103 is arranged between a pair of electrodes, a first electrode 101 (corresponding to an anode in Fig. 1A) and a second electrode 102 (corresponding to a cathode in Fig. 1A). The EL layer 103 comprises at least one light-emitting layer 113. Furthermore, functional layers, such as a hole injection layer 111, a hole transport layer 112, an electron transport layer 114, and an electron injection layer 115, can be provided. The light-emitting layer 113 contains a light-emitting substance (a guest material) and a host material. In the light-emitting device, applying a voltage between the pair of electrodes causes the injection of electrons and holes from the cathode and the anode, respectively, into the EL layer 113; thus, a current flows. When charge carriers (electrons and holes) recombine in the light-emitting layer 113, excitons are generated, and the excitation energy of the excitons is converted into light emission, thereby enabling light emission from the light-emitting device. It should be noted that, as shown in Fig. 1B, the light-emitting layer 113 of this embodiment contains a compound 132, which is an energy acceptor and serves as the light-emitting substance (guest material), and a compound 131, which is an energy donor and serves as the host material.This embodiment describes the case in which the compound of an embodiment of the present invention is used as a light-emitting substance (host material). It should be noted that the light-emitting layer 113 can contain a plurality of compounds serving as host material. Regarding the excitons generated by charge carrier recombination, the singlet exciton generation accounts for 25%, and the triplet exciton generation accounts for 75%. Therefore, it is preferable for not only singlet excitons but also triplet excitons to contribute to light emission in order to improve the emission efficiency of the light-emitting device. Here, the concept of energy transfer occurring between the guest material and the host material in the light-emitting layer 113 is described with reference to Figures 2A and 2B. It should be noted that Figure 2A shows a structure of a general guest material (a fluorescent substance) and illustrates the concept of energy transfer between the guest material and the host material when using this general guest material.2B represents a structure of compound 132 of an embodiment of the present invention and a concept of energy transfer between the guest material and the host material when using compound 132 as the guest material. Fig. 2A depicts a state in which compound 131, serving as the host material, and a fluorescent substance 124, serving as the guest material, are present. It should be noted that the fluorescent substance 124 is a general fluorescent substance and contains a luminophore 124a, but no protecting group. Fig. 2B depicts a state in which compound 131, serving as the host material, and compound (fluorescent substance) 132, which is an embodiment of the present invention, are present. It should be noted that compound 132 is a fluorescent substance serving as an energy acceptor in the light-emitting device and comprises a luminophore 132a and a protecting group 132b. It should be noted that the protecting group 132b has a function of removing the luminophore 132a and compound (host material) 131 from each other at such a distance that energy transfer from compound (host material) 131 to luminophore 132a via the Dexter mechanism is less likely to occur. In the light-emitting layer 113, as shown in Fig. 2A and Fig. 2B, compound 131, which serves as the host material, and the fluorescent substance 124 and compound (fluorescent substance) 132, which serve as guest materials, are located close to each other. As shown in Fig. 2A, the distance between the luminophore 124a and compound 131 is short when the fluorescent substance 124 does not have a protecting group, and therefore energy transfer from compound 131 to the fluorescent substance 124 can occur via both the Förster mechanism (route A6 in Fig. 2A) and the Dexter mechanism (route A7 in Fig. 2A).In the case where the guest material is a fluorescent material, even if the transfer of triplet excitation energy from the host material to the guest material occurs via the Dexter mechanism and the triplet excitation state of the guest material is generated, a non-radiative decay of the triplet excitation energy is caused, which could be a factor in reducing the emission efficiency of the light-emitting device. In contrast, in Fig. 2B, the distance between the luminophore 132a and the compound 131, which serves as the host material, can be long because the compound (fluorescent substance) 132, which serves as the guest material, has the protecting group 132b. This prevents energy transfer (route A7) through the Dexter mechanism. Here, the luminophore 124a in the fluorescent substance 124 in Fig. 2A and the luminophore 132a in the compound (fluorescent substance) 132 in Fig. 2B are described. The luminophore (124a, 132a) is a group of atoms (a framework) that produces light emission in a fluorescent substance. The luminophore (124a, 132a) generally has a π-bond and preferably comprises an aromatic ring, more preferably a condensed aromatic ring or a condensed heteroaromatic ring. Examples of the condensed aromatic ring or the condensed heteroaromatic ring in the luminophore (124a, 132a) include a phenanthrene ring, a stilbene ring, an acridone ring, a phenoxazine ring, and a phenothiazine ring.Specific examples include a naphthalene ring, an anthracene ring, a fluorene ring, a chrysene ring, a triphenylene ring, a tetracene ring, a pyrene ring, a perylene ring, a quinoline ring, a benzimidazole ring, a quinazoline ring, a carbazole ring, an acridine ring, a coumalinate ring, a quinacridone ring, a naphthobisbenzofuran ring, a dibenzofuran ring, a dibenzothiophene ring, an indenocarbazole ring, an indolocarbazole ring, and a dibenzocarbazole ring. It should be noted that an anthracene framework, as luminophore 132a, which is included in compound 132 of an embodiment of the present invention, is particularly preferred. The protecting group 132b in the compound (the fluorescent substance) 132 in Fig. 2B preferably has a higher T1 level than the luminophore 132a and the compound 131, which serves as the host material. It should be noted that a specific example of the protecting group 132b in compound 132 of an embodiment of the present invention is preferably a cycloalkyl group with a bridge structure and with 7 to 10 carbon atoms. Further specific examples include an alkyl group with 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group with 3 to 10 carbon atoms, and a trialkylsilyl group with 3 to 12 carbon atoms. The protecting group 132b described above leads to a bulky structure; Therefore, the distance between the luminophore 132a of compound 132, which serves as guest material, and the compound 131, which serves as host material, can be long. Next, a structure of the light-emitting layer of the light-emitting device of an embodiment of the present invention will be described. <Strukturbeispiel 1 der Licht emittierenden Schicht> This structural example shows the light-emitting layer 113 of the light-emitting device, which contains compound 131, serving as the host material, and compound 132, serving as the light-emitting substance (guest material). A TADF material is used as compound 131, and a fluorescent substance is used as compound 132, serving as the light-emitting substance (guest material). Therefore, it is preferable that a compound from an embodiment of the present invention be used as compound 132, which is a fluorescent substance. Fig. 3A shows an example of the correlation of energy levels in the light-emitting layer 113 in this structural example. The following explains what the terms and symbols in Fig.Represent 3A: Host (131): connection 131; Guest (132): connection 132; TC1: the T1 level of connection 131; SC1: the S1 level of connection 131; SG: the S1 level of connection 132; and TG: the T1 level of connection 132. In this structural example, compound 131 is a TADF material and therefore exhibits a function for converting the triplet excitation energy to the singlet excitation energy by upconversion (Route A1 in Fig. 3A). The singlet excitation energy of compound 131 is rapidly transferred to compound 132 (Route A2 in Fig. 3A). The preferred relationship between the SC1 of compound 131 and the SG of compound 132 is SC1 ≥ SG. Note that SC1 is the energy with a wavelength of the line obtained by extrapolating a tangent to the fluorescence spectrum of compound 131 at a tail on the short-wavelength side, and that SG is the energy with a wavelength of the absorption edge of the absorption spectrum of compound 132. As described above, by transferring the triplet excitation energy generated in compound 131 through route A1 and route A2 to the S1 level of compound 132, which serves as the guest material, compound 132 can emit light efficiently, and the emission efficiency of the light-emitting device can be increased. In route A2, compound 131 acts as an energy donor and compound 132 as an energy acceptor. It should be noted that in the light-emitting layer 113 of the light-emitting device of this structural example, the routes described above could compete with a route through which the triplet excitation energy generated in compound 131 is transferred to the T1 level of compound 132 (route A3 in Fig. 3A).If such energy transfer (Route A3) occurs, the triplet excitation energy of compound 132, which is a fluorescent substance, cannot contribute to light emission, thus reducing the emission efficiency of the light-emitting device. The Förster mechanism (dipole-dipole interaction) and the Dexter mechanism (electron exchange interaction) are generally known as mechanisms of intermolecular energy transfer. The Dexter mechanism is predominantly generated when the distance between the compound acting as an energy donor and the compound acting as an energy acceptor is 1 nm or less. Therefore, increasing the concentration of the compound acting as an energy acceptor is likely to result in the generation of the Dexter mechanism.Therefore, if, as in this structural example, compound 132, which serves as the energy acceptor, is a fluorescent material with a low triplet excitation energy level and the concentration of compound 132 is high, then, with respect to the triplet excitation energy of compound 131, which serves as the energy donor, energy transfer via the Dexter mechanism through route A3 and the non-radiative decay of the triplet excitation energy after energy transfer are dominant. To suppress energy transfer via route A3, it is therefore important that the distance between compound 131 and compound 132 is long enough to prevent energy transfer via the Dexter mechanism. The T1 level (TG) of compound 132, which acts as an energy acceptor, often originates from the luminophore contained within compound 132. Therefore, it is important to increase the distance between compound 131 and the luminophore contained within compound 132 in order to suppress energy transfer through route A3 in the light-emitting layer 113. As a general example of a method for increasing the distance between an energy donor and a luminophore contained within an energy acceptor, a reduction in the concentration of the energy acceptor in the mixed film is suggested. However, reducing the concentration of the energy acceptor not only suppresses energy transfer from the energy donor to the energy acceptor based on the Dexter mechanism, but also energy transfer via the Förster mechanism. In this case, the emission efficiency or reliability of the light-emitting device is reduced, since route A2 is based on the Förster mechanism. In contrast, the compound of one embodiment of the present invention has a luminophore and a protecting group in its structure.In the case where the compound of an embodiment of the present invention serves as an energy acceptor in the light-emitting layer 113, the protecting group has a function of increasing the distance between another energy donor and the luminophore. Therefore, in the case where the compound of an embodiment of the present invention is used as compound 132, the distance between compound 132 and compound 131 can be large. If the distance between the energy donor and the energy acceptor is less than or equal to 1 nm, the Dexter mechanism is dominant. If the distance is greater than or equal to 1 nm and less than or equal to 10 nm, the Förster mechanism is dominant. For this reason, the protecting group is preferably a bulky substituent extending in the range of 1 nm to 10 nm from the luminophore.The protecting group described above is preferably used as the protecting group in the compound of an embodiment of the present invention. Using the compound of an embodiment of the present invention as compound 132, even when the concentration of compound 132 is increased, the rate of energy transfer through the Förster mechanism can be increased, while energy transfer through the Dexter mechanism is suppressed. In other words, the transfer of singlet excitation energy (route A2) from the S1 level (SC1) of compound 131 to the S1 level (SG) of compound 132 is more likely to occur, while the transfer of triplet excitation energy (route A3: energy transfer through the Dexter mechanism) from compound 131 to the T1 level (TG) of compound 132 is less likely to occur.Therefore, the emission efficiency of the light-emitting device can be increased, while a decrease in emission efficiency due to energy transfer through route A3 can be suppressed. By increasing the rate of energy transfer through the Förster mechanism, the excitation lifetime of the energy acceptor in the light-emitting layer is shortened, thereby improving the reliability of the light-emitting device. In particular, the concentration of compound 132 in the light-emitting layer 113, relative to compound 131, which serves as the energy donor, is preferably greater than or equal to 2 wt.% and less than or equal to 50 wt.%, more preferably greater than or equal to 5 wt.% and less than or equal to 30 wt.%, and even more preferably greater than or equal to 5 wt.% and less than or equal to 20 wt.%. <Strukturbeispiel 2 der Licht emittierenden Schicht> This structural example shows the light-emitting layer 113 in the light-emitting device, which contains compound 131, compound 132, and compound 133. A combination of compound 131 and compound 133 forms an exciplex. A fluorescent substance (ExEF) is used as compound 132, which serves as the light-emitting substance (guest material). Therefore, it is preferable that a compound from an embodiment of the present invention be used as compound 132, which is a fluorescent substance. Fig. 3B shows an example of the correlation of energy levels in the light-emitting layer 113 in this structural example. The following explains the terms and symbols in Fig.Represent 3B: Comp (131): connection 131; Comp (133): connection 133; Guest (132): connection 132; SC1: the S1 level of connection 131; TC1: the T1 level of connection 131; SC3: the S1 level of connection 133; TC3: the T1 level of connection 133; SG: the S1 level of connection 132; TG: the T1 level of connection 132; SE: the S1 level of the exciplex; and TE: the T1 level of the exciplex. Although any combination of compound 131 and compound 133 capable of forming an exciplex is acceptable, preferably one of them is a compound with hole transport properties and the other is a compound with electron transport properties. In this case, a donor-acceptor exciplex is readily formed; thus, an exciplex can be efficiently formed. If compounds 131 and 133 are a combination of a compound with hole transport properties and a compound with electron transport properties, the charge carrier balance can be easily controlled as a function of the mixing ratio. In particular, the weight ratio of the compound with hole transport properties to the compound with electron transport properties is preferably within a range of 1:9 to 9:1.Since the charge carrier equilibrium can be easily controlled by the above composition, a charge carrier recombination range can also be easily controlled. For the efficient formation of an exciplex by combining the host materials, the following is preferably fulfilled: The HOMO level of one of compounds 131 and 133 is higher than that of the other compound, and the LUMO level of one of the compounds is higher than that of the other compound. It should be noted that the HOMO level of compound 131 can be equal to that of compound 133, or the LUMO level of compound 131 can be equal to that of compound 133. It should be noted that the LUMO levels and the HOMO levels of the compounds can be obtained from the electrochemical properties (the reduction potentials and the oxidation potentials) of the compounds, which are measured by cyclic voltammetry (CV). As shown in Fig. 3B, the S1 level (SE) and the T1 level (TE) of the exciplex formed by compound 131 and compound 133 are energy levels that are close to each other (see route A6 in Fig. 3B). Since the excitation energy levels (SE and TE) of the exciplex are lower than the S1 levels (SC1 and SC3) of the substances (compounds 131 and 133) that form the exciplex, an excitation state with lower excitation energy can be formed. Consequently, the operating voltage of the light-emitting device can be reduced. Since the S1 level (SE) and the T1 level (TE) of the exciplex are close together, reverse intersystem crossing occurs readily; the exciplex exhibits a TADF property. Therefore, the exciplex has a function for converting the triplet excitation energy to the singlet excitation energy by upconversion (Route A7 in Fig. 3B). The singlet excitation energy of the exciplex can be rapidly transferred to junction 132 (Route A8 in Fig. 3B). At this point, SE ≥ SG preferentially satisfies. In Route A8, the exciplex acts as an energy donor, and junction 132 acts as an energy acceptor. In particular, SE≥ SG is preferably satisfied if SE is the energy with a wavelength of the line obtained by extrapolating a tangent to the fluorescence spectrum of the exciplex at a tail on the short wavelength side, and SG is the energy with a wavelength of the absorption edge of the absorption spectrum of compound 132.To improve the TADF property, the T1 levels of the two compounds 131 and 133, i.e., TC1 and TC3, are preferably higher than or equal to TE. As an index for such TC1 and TC3, the emission peak wavelengths of the phosphorescence spectra of compounds 131 and 133 on the shortest wavelength side are preferably each less than or equal to the maximum emission peak wavelength of the exciplex.If the energy level corresponding to a wavelength of the line obtained by extrapolating a tangent to the fluorescence spectrum of the exciplex at a tail on the short-wavelength side is SE, the energy level corresponding to a wavelength of the line obtained by extrapolating a tangent to the phosphorescence spectrum of compound 131 at a tail on the short-wavelength side is TC1, and the energy level corresponding to a wavelength of the line obtained by extrapolating a tangent to the phosphorescence spectrum of compound 133 at a tail on the short-wavelength side is TC3, then SE-TC1 ≤ 0.2 eV and SE-TC3 ≤ 0.2 eV are preferably satisfied. The triplet excitation energy generated in the light-emitting layer 113 is transferred via route A6 and route A8 to the S1 level of compound 132, which serves as the guest material, enabling compound 132 to emit light. Therefore, by using a combination of materials forming an exciplex in the light-emitting layer 113, the emission efficiency of the fluorescent light-emitting device can be increased. However, the aforementioned routes could compete with a route through which the triplet excitation energy generated in the light-emitting layer 113 is transferred to the T1 level of compound 132 (route A9 in Fig. 3B). If such an energy transfer (Route A9) occurs, the triplet excitation energy of compound 132, which is a fluorescent substance, cannot contribute to light emission, thus reducing the emission efficiency of the light-emitting device. To suppress such energy transfer (Route A9 in Fig. 3B), it is important, as described in structural example 1, that the distance between compound 132 and the exciplex formed by compound 131 and compound 133 is long, and that the distance between the exciplex and the luminophore contained in compound 132 is long. The compound of an embodiment of the present invention comprises a luminophore and a protecting group in its structure. In the case where the compound of an embodiment of the present invention serves as an energy acceptor in the light-emitting layer 113, the protecting group has a function of increasing the distance between another energy donor and the luminophore. Therefore, in the case where the compound of an embodiment of the present invention is used as compound 132 of this structural example, the distance between compound 132 and an exciplex formed by compound 131 and compound 133 can be long, even if the concentration of compound 132 is increased; consequently, the rate of energy transfer by the Förster mechanism can be increased, while energy transfer by the Dexter mechanism can be suppressed.Using the connection of an embodiment of the present invention as connection 132, the transfer of triplet excitation energy (route A6 and route A8 in Fig. 3B) from the exciplex to the S1 level (SG) of connection 132 is more likely to occur, while the transfer of triplet excitation energy (route A9: energy transfer via the Dexter mechanism) from the exciplex to the T1 level (TG) of connection 132 is less likely to occur. Therefore, the emission efficiency of the light-emitting device can be increased, while a decrease in emission efficiency due to energy transfer via route A9 can be suppressed. Furthermore, the reliability of the light-emitting device can be improved. It should be noted that in this description, routes A6, A7, and A8, which have been described above, are also referred to as exciplex singlet energy transfer (ExSET) or exciplex-enhanced fluorescence (ExEF). In other words, in the light-emitting layer 113 in this description, the excitation energy is supplied from the exciplex to the fluorescent material. <Strukturbeispiel 3 der Licht emittierenden Schicht> This structural example shows the light-emitting layer 113 in the light-emitting device, which contains compound 131, compound 132, and compound 133. A combination of compound 131 and compound 133 forms an exciplex. A fluorescent substance (ExEF) is used as compound 132, which serves as the light-emitting substance (guest material). Furthermore, this structural example differs from structural example 2 in that compound 133 is a phosphorescent material. It is preferable that a compound from an embodiment of the present invention, which is a fluorescent substance, is used as compound 132. Fig. 3C shows an example of the correlation of energy levels in the light-emitting layer 113 in this structural example. It should be noted that the terms and symbols in Fig. 3C are the same as those in Fig. 3B, and therefore their description is omitted. In this structural example, a compound containing a heavy atom is used as one of the compounds forming an exciplex. Therefore, intersystem crossing between a singlet state and a triplet state is promoted. Consequently, an exciplex can be formed that is capable of transitioning from a triplet excitation state to a singlet ground state (i.e., emitting phosphorescence). In this case, unlike a typical exciplex, the triplet excitation energy level (TE) of the exciplex is that of an energy donor; therefore, TE is preferably higher than or equal to the singlet excitation energy level (SG) of compound 132, which serves as the light-emitting material.In particular, TE≥ SG is preferably satisfied if TE is the energy with a wavelength of the line obtained by extrapolating a tangent to the emission spectrum of the exciplex containing a heavy atom at a tail on the short wavelength side, and SG is the energy with a wavelength of the absorption edge of the absorption spectrum of compound 132. With such a correlation of energy levels, the triplet excitation energy of the formed exciplex can be transferred from the triplet excitation energy level of the exciplex (TE) to the singlet excitation energy level of compound 132 (SG). It should be noted that in some cases it is difficult to clearly distinguish fluorescence and phosphorescence in an emission spectrum because the S1 level and the T1 level (SE and TE) of the exciplex are close together. In this case, fluorescence and phosphorescence can sometimes be distinguished by their emission lifetimes. It should be noted that the phosphorescent material used in the preceding structure preferably contains a heavy atom, such as Ir, Pt, Os, Ru, or Pd. In contrast, in this structural example, the phosphorescent material acts as an energy donor; therefore, the quantum yield is not important. That is to say, the energy transfer from the triplet excitation energy level of the exciplex to the singlet excitation energy level of the guest material is acceptable as long as it is an allowed transition. The energy transfer from the phosphorescent material or the exciplex formed using the phosphorescent material to the guest material is preferred, in which case the energy transfer from the triplet excitation energy level of the energy donor to the singlet excitation energy level of the guest material (energy acceptor) is an allowed transition. As shown in Fig. 3C, in the light-emitting layer 113 of the light-emitting device of this structure, the triplet excitation energy of the exciplex is transferred to the S1 level (SG) of the guest material via route A8 (without route A7 in Fig. 3C). That is, the triplet excitation energy and the singlet excitation energy can be transferred to the S1 level of the guest material via routes A6 and A8. In route A8, the exciplex acts as an energy donor and compound 132 as an energy acceptor. It should be noted that in the light-emitting layer 113 of the light-emitting device of this structural example, the aforementioned routes could compete with a route through which the triplet excitation energy of the exciplex is transferred to the T1 level of compound 132 (route A9 in Fig. 3C).If such energy transfer (Route A9) occurs, the triplet excitation energy of compound 132, which is a fluorescent substance, cannot contribute to light emission, thus reducing the emission efficiency of the light-emitting device. In order to suppress such energy transfer (Route A9), it is important, as described in structural example 1, that the distance between junction 131 and junction 132 and the distance between junction 131 and the luminophore contained in junction 132 are long. The compound of an embodiment of the present invention comprises a luminophore and a protecting group in its structure. In the case where the compound of an embodiment of the present invention serves as an energy acceptor in the light-emitting layer 113, the protecting group has a function of increasing the distance between another energy donor and the luminophore. Therefore, in the case where the compound of an embodiment of the present invention is used as compound 132 of this structural example, the distance between compound 132 and an exciplex formed by compound 131 and compound 133 can be long, even if the concentration of compound 132 is increased; consequently, the rate of energy transfer by the Förster mechanism can be increased, while energy transfer by the Dexter mechanism can be suppressed.Using the connection of an embodiment of the present invention as connection 132, the transfer of triplet excitation energy (route A6 and route A8) from the exciplex to the S1 level (SG) of connection 132 is more likely to occur, while the transfer of triplet excitation energy (route A9: energy transfer via the Dexter mechanism) from the exciplex to the T1 level (TG) of connection 132 is less likely to occur. Therefore, the emission efficiency of the light-emitting device can be increased, while a decrease in emission efficiency due to energy transfer via route A9 can be suppressed. Furthermore, the reliability of the light-emitting device can be improved. <Strukturbeispiel 4 der Licht emittierenden Schicht> This structural example shows the light-emitting layer 113 in the light-emitting device, which contains three types of substances: compound 131, compound 132, and compound 133. A combination of compound 131 and compound 133 forms an exciplex. A fluorescent substance (ExEF) is used as compound 132, which serves as the light-emitting substance (guest material). Therefore, it is preferable that a compound from an embodiment of the present invention be used as compound 132, which is a fluorescent substance. It should be noted that this structural example differs from the preceding structural example 3 in that compound 133 is a TADF material. Fig. 4A shows an example of the correlation of energy levels in the light-emitting layer 113 in this structural example. It should be noted that the terms and symbols in Fig. 4A correspond to those in Fig.3B are identical and therefore their description is omitted. Since compound 133 is the TADF material in this structural example, compound 133, which does not form an exciplex, has a function for converting the triplet excitation energy to the singlet excitation energy by upconversion (route A10 in Fig. 4A). Consequently, the singlet excitation energy of compound 133 is rapidly transferred to compound 132 (route A11 in Fig. 4A). At this point, SC3 ≥ SG is preferentially satisfied. In the light-emitting layer 113 of the light-emitting device of this structural example, there is, as in structural example 3, a pathway by which the triplet excitation energy is transferred to compound 132, which serves as the guest material, via routes A6 to A8 in Fig. 4A, and a pathway by which the triplet excitation energy is transferred to compound 132 via routes A10 and A11 in Fig. 4A. In this way, there are multiple pathways by which the triplet excitation energy is transferred to compound 132, which is a fluorescent compound, so that the emission efficiency can be further increased. In route A8, the exciplex serves as the energy donor, and compound 132 serves as the energy acceptor. In route A11, compound 133 serves as the energy donor, and compound 132 as the energy acceptor.It should be noted that in the light-emitting layer 113 of the light-emitting device of this structural example, the aforementioned routes could compete with a route by which the triplet excitation energy of the exciplex is transferred to the T1 level of compound 132 (route A9 in Fig. 4A). If such energy transfer (route A9) occurs, the triplet excitation energy of compound 132, which is a fluorescent substance, cannot contribute to light emission, thus reducing the emission efficiency of the light-emitting device. In order to suppress such energy transfer (Route A9), as described in structural example 1, it is important that the distance between compound 132 and the exciplex formed by compound 131 and compound 133 is long, i.e., that the distance between the exciplex formed by compound 131 and compound 133 and the luminophore contained in compound 132 is long. The compound of an embodiment of the present invention comprises a luminophore and a protecting group in its structure. In the case where the compound of an embodiment of the present invention serves as an energy acceptor in the light-emitting layer 113, the protecting group has a function of increasing the distance between another energy donor and the luminophore. Therefore, in the case where the compound of an embodiment of the present invention is used as compound 132 of this structural example, the distance between compound 132 and an exciplex formed by compound 131 and compound 133 can be long, even if the concentration of compound 132 is increased; consequently, the rate of energy transfer by the Förster mechanism can be increased, while energy transfer by the Dexter mechanism can be suppressed.Using a compound of an embodiment of the present invention as compound 132, the transfer of triplet excitation energy (route A6 and route A8) from the exciplex to the S1 level (SG) of compound 132 and the transfer of triplet excitation energy (route A10 and route A11) from the exciplex to the S1 level (SG) of compound 132 occur with a higher probability, while the transfer of triplet excitation energy (route A9: energy transfer via the Dexter mechanism) from the exciplex to the T1 level (TG) of compound 132 occurs with a lower probability. Therefore, the emission efficiency of the light-emitting device can be increased, while a decrease in emission efficiency due to energy transfer via route A9 can be suppressed. Furthermore, the reliability of the light-emitting device can be improved. <Strukturbeispiel 5 der Licht emittierenden Schicht> This structural example shows the light-emitting layer 113 in the light-emitting device, which contains four types of substances: compound 131, compound 132, compound 133, and compound 134. Compound 133 has a function for converting the triplet excitation energy into light emission, and the case in which a phosphorescent substance is used as compound 133 is described. A combination of compound 131 and compound 134 forms an exciplex. A fluorescent substance is used as compound 132, which serves as the light-emitting substance (guest material). It is preferable that a compound from an embodiment of the present invention, which is a fluorescent substance, is used as compound 132. Fig. 4B shows an example of the correlation of energy levels in the light-emitting layer 113 in this structural example.It should be noted that the terms and symbols in Fig. 4B are similar to those in Fig. 3B, and the other terms and symbols are as follows: SC4: the S1 level of compound 134; and TC4: the T1 level of compound 134. In this structural example, compound 131 and compound 134 form an exciplex. The S1 level (SE) and the T1 level (TE) of the exciplex are close to each other (see route A12 in Fig. 4B). It should be noted that if the exciplex formed by the above pathway from the two types of substances loses its excitation energy, the two types of substances will exist as original, distinct substances. Since the excitation energy levels (SE and TE) of the exciplex are lower than the S1 levels (SC1 and SC4) of the substances (compounds 131 and 134) that form the exciplex, an excitation state with lower excitation energy can be formed. Consequently, the operating voltage of the light-emitting device can be reduced. Since compound 133 is a phosphorescent material, intersystem crossing between a singlet state and a triplet state is permitted. Thus, both the singlet and triplet excitation energies of the exciplex are rapidly transferred to compound 133 (route A13). At this point, TE ≥ TC3 is preferentially satisfied. The triplet excitation energy of compound 133 is converted into the singlet excitation energy of compound 132 (route A14). As shown in Fig. 4B, the relationship TE ≥ TC3 ≥ SG is preferentially satisfied because the energy is efficiently transferred from compound 133 to compound 132. In particular, TC3 ≥ SG is preferentially satisfied when TC3 is the energy with a wavelength of the line obtained by extrapolating a tangent to the phosphorescence spectrum of compound 133 at a tail on the short-wavelength side, and SG is the energy with a wavelength of the absorption edge of the absorption spectrum of compound 132. In route A14, compound 133 acts as an energy donor and compound 132 as an energy acceptor. Although in this structural example any combination of compound 131 and compound 134 that can form an exciplex is acceptable, preferably one of them is a compound with a hole transport property and the other is a compound with an electron transport property. For the combination of the host materials to efficiently form an exciplex, the following is preferably fulfilled: The HOMO level of one of the compounds 131 and 134 is higher than that of the other compound, and the LUMO level of one of the compounds is higher than that of the other compound. The correlation of energy levels of compounds 131 and 134 is not limited to that shown in Fig. 4B. That is, the singlet excitation energy level (SC1) of compound 131 can be higher or lower than the singlet excitation energy level (SC4) of compound 134. The triplet excitation energy level (TC1) of compound 131 can be higher or lower than the triplet excitation energy level (TC4) of compound 134. In the light-emitting device of this structural example, compound 131 preferably has a π-electron-deficient framework. Such a composition reduces the LUMO level of compound 131, which is suitable for the formation of an exciplex. In the light-emitting device of this structural example, compound 131 preferably has a π-electron-rich framework. Such a composition increases the HOMO level of compound 131, which is suitable for the formation of an exciplex.The compound of an embodiment of the present invention comprises a luminophore and a protecting group. In the case where the compound of an embodiment of the present invention serves as an energy acceptor in the light-emitting layer 113, the protecting group has a function of increasing the distance between another energy donor and the luminophore. Therefore, in the case where the compound of an embodiment of the present invention is used as compound 132, the distance between compound 133 and compound 132 can be considerable.Using the connection of an embodiment of the present invention as connection 132, the transfer of triplet excitation energy (route A14) from connection 133 to the S1 level (SG) of connection 132 is more likely to occur, while the transfer of triplet excitation energy (route A15: energy transfer via the Dexter mechanism) from connection 133 to the T1 level (TG) of connection 132 is less likely to occur. Therefore, the emission efficiency of the light-emitting device can be increased, while a decrease in emission efficiency due to energy transfer via route A15 can be suppressed. In this structural example, increasing the concentration of compound 132, which serves as an energy acceptor, can increase the rate of energy transfer through the Förster mechanism while suppressing energy transfer through the Dexter mechanism. Increasing the rate of energy transfer through the Förster mechanism shortens the excitation lifetime of the energy acceptor in the light-emitting layer, thereby improving the reliability of the light-emitting device. In particular, the concentration of compound 132 in the light-emitting layer 113, relative to compound 133, which serves as an energy donor, is preferably greater than or equal to 2 wt.% and less than or equal to 50 wt.%, more preferably greater than or equal to 5 wt.% and less than or equal to 30 wt.%, and even more preferably greater than or equal to 5 wt.% and less than or equal to 20 wt.%. It should be noted that in this description, routes A12 and A13, which have been described above, are also referred to as exciplex triplet energy transfer (ExTET). This means that in the light-emitting layer 113, the excitation energy is supplied from the exciplex to the junction 133 in this description. <Strukturbeispiel 6 der Licht emittierenden Schicht> This structural example shows the light-emitting layer 113 in the light-emitting device, which contains four types of substances: compound 131, compound 132, compound 133, and compound 134. Compound 133 has a function for converting the triplet excitation energy into light emission, and the case in which a phosphorescent substance is used as compound 133 is described. A combination of compound 131 and compound 134 forms an exciplex. A fluorescent substance is used as compound 132, which serves as the light-emitting substance (guest material). It is preferable that a compound from an embodiment of the present invention, which is a fluorescent substance, is used as compound 132. It should be noted that this structural example differs from the preceding structural example 5 in that compound 134 is a TADF material. Fig.Figure 4C shows an example of the correlation of energy levels in the light-emitting layer 113 in this structural example. It should be noted that the terms and symbols in Figure 4C are the same as those in Figures 3B and 4B, and therefore their description is omitted. Since compound 134 is the TADF material in this structural example, compound 134, which does not form an exciplex, exhibits a function for converting the triplet excitation energy to the singlet excitation energy by upconversion (Route A16 in Fig. 4C). Consequently, the singlet excitation energy of compound 134 is rapidly transferred to compound 132 (Route A17 in Fig. 4C). At this point, SC4 ≥ SG is preferentially satisfied. In particular, SC4 ≥ SG is preferentially satisfied if SC4 is the energy with a wavelength of the line obtained by extrapolating a tangent to the fluorescence spectrum of compound 134 at a tail on the short-wavelength side, and SG is the energy with a wavelength of the absorption edge of the absorption spectrum of compound 132. In the light-emitting layer 113 of the light-emitting device of this structural example, there is, as in structural example 5, a pathway by which the triplet excitation energy is transferred to compound 132, which serves as the guest material, via routes A12 to A14 in Fig. 4C, and a pathway by which the triplet excitation energy is transferred to compound 132 via routes A16 and A17 in Fig. 4C. In this way, there are multiple pathways by which the triplet excitation energy is transferred to compound 132, which is a fluorescent compound, so that the emission efficiency can be further increased. In route A14, compound 133 serves as the energy donor and compound 132 as the energy acceptor. In route A17, compound 134 serves as the energy donor and compound 132 as the energy acceptor.It should be noted that in the light-emitting layer 113 of the light-emitting device of this structural example, the routes described above could compete with a route by which the triplet excitation energy of compound 133 is transferred to the T1 level of compound 132 (route A15 in Fig. 4C). If such energy transfer (route A15) occurs, the triplet excitation energy of compound 132, which is a fluorescent substance, cannot contribute to light emission, thus reducing the emission efficiency of the light-emitting device. In order to suppress such energy transfer (route A15), it is important, as described in structural example 1, that the distance between compound 133 and compound 132, i.e. the distance between compound 133 and the luminophore contained in compound 132, is long. The compound of an embodiment of the present invention comprises a luminophore and a protecting group. In the case where the compound of an embodiment of the present invention serves as an energy acceptor in the light-emitting layer 113, the protecting group has a function of increasing the distance between another energy donor and the luminophore. Therefore, in the case where the compound of an embodiment of the present invention is used as compound 132 of this structural example, the distance between compound 133 and compound 132 can be large, even if the concentration of compound 132 is increased; consequently, the rate of energy transfer by the Förster mechanism can be increased, while energy transfer by the Dexter mechanism can be suppressed.Using a connection of an embodiment of the present invention as connection 132, the transfer of triplet excitation energy (route A12, route A13, and route A14) from the exciplex to the S1 level (SG) of connection 132 and the transfer of triplet excitation energy (route A16 and route A17) from connection 133 to the S1 level (SG) of connection 132 occur with a higher probability, while the transfer of triplet excitation energy (route A15: energy transfer via the Dexter mechanism) from connection 133 to the T1 level (TG) of connection 132 occurs with a lower probability. Therefore, the emission efficiency of the light-emitting device can be increased, while a decrease in emission efficiency due to energy transfer via route A15 can be suppressed. Furthermore, the reliability of the light-emitting device can be improved. <Strukturbeispiel 7 der Licht emittierenden Schicht> This structural example shows the light-emitting layer 113 in the light-emitting device, which contains compound 131, compound 132, and compound 133. Compound 133 has a function for converting the triplet excitation energy into light emission, and the case in which a phosphorescent substance is used as compound 133 is described. A fluorescent substance is used as compound 132, which serves as the light-emitting substance (guest material). It is preferable that a compound from an embodiment of the present invention be used as compound 132, which is a fluorescent substance. Fig. 5A shows an example of the correlation of energy levels in the light-emitting layer 113 in this structural example. The following explains what the terms and symbols in Fig.Represent 5A: Comp (131): connection 131; Comp (133): connection 133; Guest (132): connection 132; SC1: the S1 level of connection 131; TC1: the T1 level of connection 131; TC3: the T1 level of connection 133; TG: the T1 level of connection 132; and SG: the S1 level of connection 132. In this structural example, charge carrier recombination occurs mainly in compound 131, generating singlet and triplet excitons. If a phosphorescent substance exhibiting a TC3 ≤ TC1 relationship is chosen as compound 133, the singlet and triplet excitation energies generated in compound 131 can be transferred to the TC3 level of compound 133 (route A18 in Fig. 5A). Some of the charge carriers can also recombine in compound 133. It should be noted that the phosphorescent substance used in the above structure preferably contains a heavy atom, such as Ir, Pt, Os, Ru, or Pd. A phosphorescent substance is preferably used as compound 133, in which case the energy transfer from the triplet excitation energy level of the energy donor to the singlet excitation energy level of the guest material (energy acceptor) is an allowed transition. Therefore, the triplet excitation energy of compound 133 can be transferred to the S1 level (SG) of the guest material via route A19. In route A19, compound 133 serves as the energy donor and compound 132 as the energy acceptor. In this case, TC3 ≥ SG is preferably satisfied, since the excitation energy of compound 133 is efficiently transferred to the singlet excitation state of compound 132, which serves as the guest material.In particular, TC3 ≥ SG is preferably satisfied if TC3 is the energy level corresponding to a wavelength of the line obtained by extrapolating a tangent to the phosphorescence spectrum of compound 133 at a tail on the short-wavelength side, and SG is the energy level corresponding to a wavelength corresponding to the absorption edge of the absorption spectrum of compound 132. It should be noted that in the light-emitting layer 113 of the light-emitting device of this structural example, the aforementioned routes could compete with a route by which the triplet excitation energy of compound 133 is transferred to the T1 level of compound 132 (route A20 in Fig. 5A). If such energy transfer (route A20) occurs, the triplet excitation energy of compound 132, which is a fluorescent substance, cannot contribute to light emission, thus reducing the emission efficiency of the light-emitting device. In order to suppress such energy transfer (route A20), it is important, as described in structural example 1, that the distance between junction 133 and junction 132, i.e., the distance between junction 133 and the luminophore contained in junction 132, is long. The compound of an embodiment of the present invention comprises a luminophore and a protecting group. In the case where the compound of an embodiment of the present invention serves as an energy acceptor in the light-emitting layer 113, the protecting group has a function of increasing the distance between another energy donor and the luminophore. Therefore, in the case where the compound of an embodiment of the present invention is used as compound 132 of this structural example, the distance between compound 133 and compound 132 can be large, even if the concentration of compound 132 is increased; consequently, the rate of energy transfer by the Förster mechanism can be increased, while energy transfer by the Dexter mechanism can be suppressed.Using a connection of an embodiment of the present invention as connection 132, the transfer of triplet excitation energy (route A19) from connection 133 to the S1 level (SG) of connection 132 is more likely to occur, while the transfer of triplet excitation energy (route A20: energy transfer via the Dexter mechanism) from connection 133 to the T1 level (TG) of connection 132 is less likely. Therefore, the emission efficiency of the light-emitting device can be increased, while a decrease in emission efficiency due to energy transfer via route A20 can be suppressed. Furthermore, the reliability of the light-emitting device can be improved. <Strukturbeispiel 8 der Licht emittierenden Schicht> This structural example shows the light-emitting layer 113 in the light-emitting device, which contains compound 131, compound 132, and compound 133. Compound 133 has a function for converting the triplet excitation energy into light emission, and the case in which a TADF material is used as compound 133 is described. A fluorescent substance is used as compound 132, which serves as the light-emitting substance (guest material). It is preferable that a compound from an embodiment of the present invention, which is a fluorescent substance, is used as compound 132. Fig. 5B shows an example of the correlation of energy levels in the light-emitting layer 113 in this structural example. It should be noted that the terms and symbols in Fig. 5B are similar to those in Fig. 5A, and the other terms and symbols are as follows: SC3: the S1 level of compound 133. In this structural example, charge carrier recombination occurs mainly in compound 131, generating singlet and triplet excitons. If a TADF material exhibiting the relationship SC3 ≤ SC1 and TC3 ≤ TC1 is selected as compound 133, the singlet and triplet excitation energies generated in compound 131 can be transferred to the SC3 and TC3 levels of compound 133 (route A21 in Fig. 5B). Some of the charge carriers can also recombine in compound 133. Since compound 133 is the TADF material, it possesses a function for converting the triplet excitation energy to the singlet excitation energy by upconversion (Route A22 in Fig. 5B). Consequently, the singlet excitation energy of compound 133 can be rapidly transferred to compound 132 (Route A23 in Fig. 5B). At this point, SC3 ≥ SG is preferentially satisfied. In particular, SC3 ≥ SG is preferentially satisfied if SC3 is the energy with a wavelength of the line obtained by extrapolating a tangent to the fluorescence spectrum of compound 133 at a tail on the short-wavelength side, and SG is the energy with a wavelength of the absorption edge of the absorption spectrum of compound 132. In the light-emitting layer 113 of the light-emitting device of this structural example, the triplet excitation energy generated in compound 133 can therefore be converted into fluorescence of compound 132 via routes A21, A22, and A23 in Fig. 5B. In route A23, compound 133 acts as an energy donor and compound 132 as an energy acceptor. It should be noted that in the light-emitting layer 113 of the light-emitting device of this structural example, the aforementioned routes could compete with a route by which the triplet excitation energy of compound 133 is transferred to the T1 level of compound 132 (route A24 in Fig. 5B). If such energy transfer (Route A24) occurs, the triplet excitation energy of compound 132, which is a fluorescent substance, cannot contribute to light emission, thus reducing the emission efficiency of the light-emitting device. In order to suppress such energy transfer (route A24), it is important, as described in structural example 1, that the distance between compound 133 and compound 132, i.e. the distance between compound 133 and the luminophore contained in compound 132, is long. The compound of an embodiment of the present invention comprises a luminophore and a protecting group. In the case where the compound of an embodiment of the present invention serves as an energy acceptor in the light-emitting layer 113, the protecting group has a function of increasing the distance between another energy donor and the luminophore. Therefore, in the case where the compound of an embodiment of the present invention is used as compound 132 of this structural example, the distance between compound 133 and compound 132 can be large, even if the concentration of compound 132 is increased; consequently, the rate of energy transfer by the Förster mechanism can be increased, while energy transfer by the Dexter mechanism can be suppressed.Using the connection of an embodiment of the present invention as connection 132, the transfer of triplet excitation energy (route A23) from connection 133 to the S1 level (SG) of connection 132 is more likely to occur, while the transfer of triplet excitation energy (route A24: energy transfer via the Dexter mechanism) from connection 133 to the T1 level (TG) of connection 132 is less likely to occur. Therefore, the emission efficiency of the light-emitting device can be increased, while a decrease in emission efficiency due to energy transfer via route A24 can be suppressed. Furthermore, the reliability of the light-emitting device can be improved. (Version 3) In this embodiment, light-emitting devices of embodiments of the present invention are described. <Strukturbeispiel einer Licht emittierenden Vorrichtung> Fig. 6A shows an example of a light-emitting device that includes an EL layer with a light-emitting layer between a pair of electrodes. In particular, an EL layer 103 is provided between a first electrode 101 and a second electrode 102. In the case where, for example, the first electrode 101 is an anode, the EL layer 103 has a structure in which a hole injection layer 111, a hole transport layer 112, a light-emitting layer 113, an electron transport layer 114, and an electron injection layer 115 are arranged as functional layers in that order. The light-emitting layer 113 contains a host material and guest materials.A third organic compound 123 is used as the host material, and a first organic compound 121 (a fluorescent substance) that has a function to convert the singlet excitation energy into light emission, and a second organic compound 122 (a phosphorescent substance or a TADF material) that has a function to convert the triplet excitation energy into light emission, are used as guest materials. Embodiments of the present invention also include light-emitting devices with other structures, such as a light-emitting device that can be operated at low voltage by means of a structure (a tandem structure) in which a plurality of EL layers are provided between a pair of electrodes and a charge-generating layer is provided between the EL layers, and a light-emitting device that has an optical microresonator (microcavity) structure between a pair of electrodes and therefore has improved optical properties. The charge-generating layer has a function for injecting electrons into one of the adjacent EL layers and injecting holes into the other of the EL layers when a voltage is applied between the first electrode 101 and the second electrode 102. The first electrode 101 and / or the second electrode 102 of the light-emitting device are / are a translucent electrode (e.g., a transparent electrode or a transflective electrode). If the translucent electrode is a transparent electrode, it has a visible light transmittance of 40% or higher. If the translucent electrode is a transflective electrode, it has a visible light reflectance of 20% or higher and 80% or lower, preferably 40% or higher and 70% or lower. These electrodes preferably have a resistivity of 1 × 10⁻² Ωcm or less. Furthermore, if, in the light-emitting device of an embodiment of the present invention, either the first electrode 101 or the second electrode 102 is a reflective electrode, the reflectance for visible light of the reflective electrode is higher than or equal to 40% and lower than or equal to 100%, preferably higher than or equal to 70% and lower than or equal to 100%. This electrode preferably has a resistivity of 1 × 10⁻² Ωcm or less. <Erste Elektrode und zweite Elektrode> Any of the following materials, in a suitable combination, can be used as materials for the first electrode 101 and the second electrode 102, as long as the aforementioned functions of the electrodes can be fulfilled. For example, a metal, an alloy, an electrically conductive compound, a mixture thereof, and the like can be used in a suitable manner. In particular, an In-Sn oxide (also known as ITO), an In-Si-Sn oxide (also known as ITSO), an In-Zn oxide, or an In-W-Zn oxide can be used. Furthermore, it is possible to use a metal, such as... B. Aluminum (Al), titanium (Ti), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), gallium (Ga), zinc (Zn), indium (In), tin (Sn), molybdenum (Mo), tantalum (Ta), tungsten (W), palladium (Pd), gold (Au), platinum (Pt), silver (Ag), yttrium (Y) or neodymium (Nd), or an alloy containing a suitable combination of any of these metals.It is also possible to use an element of Group 1 or an element of Group 2 of the periodic table that has not been described above (e.g. lithium (Li), cesium (Cs), calcium (Ca) or strontium (Sr)), a rare earth metal such as europium (Eu) or ytterbium (Yb), an alloy containing a suitable combination of any of these elements, graphene or the like. These electrodes can be formed using a sputtering process or a vacuum evaporation process. <lochinjektionsschicht> The hole injection layer 111 injects holes from the first electrode 101, which serves as the anode, into the EL layer 103 and contains an organic acceptor material and a material with a high hole injection property. The organic acceptor material allows holes to be created in another organic compound whose HOMO level is close to the LUMO level of the organic acceptor material when charge separation is induced between the organic acceptor material and the organic compound. Therefore, a compound with an electron-withdrawing group (a halogen group or a cyano group), such as a quinodimethane derivative, a chloranil derivative, or a hexaazatriphenylene derivative, can be used as the organic acceptor material. Examples of the organic acceptor material include 7,7,8,8-tetracyano-2,3,5,6-tetrafluoroquinodimethane (abbreviation: F4-TCNQ), 3,6-difluoro-2,5,7,7,8,8-hexacyanoquinodimethane, chloranil, 2,3,6,7,10,11-hexacyano-1,4,5,8,9,12-hexaazatriphenylene (abbreviation: HAT-CN) and 1,3,4,5,7,8-hexafluorotetracyanonaphthoquinodimethane (abbreviation: F6-TCNNQ).Among organic acceptor materials, HAT-CN, which exhibits high acceptor properties and stable film quality against heat, is particularly preferred. Additionally, a [3]radialene derivative exhibiting very high electron acceptor properties is preferred; specific examples include α,α',α"-1,2,3-cyclopropanetriylidentris[4-cyano-2,3,5,6-tetrafluorobenzolacetonitrile], α,α',α"-1,2,3-cyclopropanetriylidentris[2,6-dichloro-3,5-difluoro-4-(trifluoromethyl)benzolacetonitrile], and α,α',α"-1,2,3-cyclopropanetriylidentris[2,3,4,5,6-pentafluorobenzolacetonitrile]. Examples of materials with high hole injection properties include transition metal oxides, such as molybdenum oxide, vanadium oxide, ruthenium oxide, tungsten oxide, and manganese oxide. Other examples are phthalocyanine-based compounds, such as phthalocyanine (abbreviation: H₂Pc) and copper phthalocyanine (abbreviation: CuPc), and the like. Other examples include aromatic amine compounds, which are low-molecular-weight compounds, such as... B. 4,4',4"-Tris(N,N-diphenylamino)triphenylamine (abbreviation: TDATA), 4,4',4"-Tris[N-(3-methylphenyl)-N-phenylamino]triphenylamine (abbreviation: MTDATA), 4,4'-Bis[N-(4-diphenylaminophenyl)-N-phenylamino]biphenyl (abbreviation: DPAB), 4,4'-Bis(N-{4-[N'-(3-methylphenyl)-N'-phenylamino]phenyl}-N-phenylamino)biphenyl (abbreviation: DNTPD), 1,3,5-Tris[N-(4-diphenylaminophenyl)-N-phenylamino]benzene (abbreviation: DPA3B), 3-[N-(9-phenylcarbazol-3-yl)-N-phenylamino]-9-phenylcarbazole (abbreviation: PCzPCA1), 3,6-Bis[N-(9-phenylcarbazol-3-yl)-N-phenylamino]-9-phenylcarbazole (abbreviation: PCzPCA2), 3-[N-(1-naphthyl)-N-(9-phenylcarbazol-3-yl)amino]-9-phenylcarbazole (Abbreviation: PCzPCN1) and the like. Other examples include high-molecular-weight compounds (e.g., oligomers, dendrimers, and polymers), such as poly(N-vinylcarbazole) (abbreviation: PVK), poly(4-vinyltriphenylamine) (abbreviation: PVTPA), poly[N-(4-{N'-[4-(4-diphenylamino)phenyl]phenyl-N'-phenylamino} phenyl)methacrylamide] (Abbreviation: PTPDMA), Poly[N,N'-bis(4-butylphenyl)-N,N'-bis(phenyl)benzidine] (Abbreviation: Poly-TPD) and the like. Alternatively, a high-molecular-weight compound to which an acid has been added can be used, such as poly(3,4-ethylenedioxythiophene) / poly(styrenesulfonic acid) (abbreviation: PEDOT / PSS) or polyaniline / poly(styrenesulfonic acid) (abbreviation: PAni / PSS). Alternatively, a composite material containing a hole transport material and an acceptor material (electron acceptor material) can be used as a material with high hole injection properties. In this case, the acceptor material extracts electrons from a hole transport material, so that holes are created in the hole injection layer 111 and injected through the hole transport layer 112 into the light-emitting layer 113. It should be noted that the hole injection layer 111 can be configured as a single-layer structure using a composite material containing a hole transport material and an acceptor material (electron acceptor material), or as a multi-layer structure consisting of a layer containing a hole transport material and a layer containing an acceptor material (electron acceptor material). The hole transport material preferably exhibits a hole mobility of greater than or equal to 1 × 10⁻⁶ cm² / Vs when the square root of the electric field strength [V / cm] is 600. It should be noted that other substances can also be used, provided they possess a hole transport property that is higher than their electron transport property. Materials with high hole transport properties, such as a π-electron-rich heteroaromatic compound (e.g., a carbazole derivative and a furan derivative) and an aromatic amine (a compound with an aromatic amine skeleton), are preferred as hole transport materials. Examples of the aforementioned carbazole derivative (a compound with a carbazole skeleton) include a bicarbazole derivative (e.g., a 3,3'-bicarbazole derivative) and an aromatic amine with a carbazolyl group. Specific examples of the bicarbazole derivative (e.g., a 3,3'-bicarbazole derivative) are 3,3'-Bis(9-phenyl-9H-carbazole) (abbreviation: PCCP), 9,9'-Bis(1,1'-biphenyl-4-yl)-3,3'-bi-9H-carbazole, 9,9'-Bis(1,1'-biphenyl-3-yl)-3,3'-bi-9H-carbazole, 9-(1,1'-Biphenyl-3-yl)-9'-(1,1'-biphenyl-4-yl)-9H,9'H-3,3'-bicarbazole (abbreviation: mBPCCBP), 9-(2-Naphthyl)-9'-phenyl-9H,9'H-3,3'-bicarbazole (abbreviation: βNCCP), and the like. Specific examples of the aforementioned aromatic amine with a carbazolyl group include 4-phenyl-4'-(9-phenyl-9H-carbazol-3-yl)triphenylamine (abbreviation: PCBA1BP), N-(4-biphenyl)-N-(9,9-dimethyl-9H-fluoren-2-yl)-9-phenyl-9H-carbazol-3-amine (abbreviation: PCBiF), N-(1,1'-biphenyl-4-yl)-N-[4-(9-phenyl-9H-carbazol-3-yl)phenyl]-9,9-dimethyl-9H-fluoren-2-amine (abbreviation: PCBBiF), 4,4'-diphenyl-4''-(9-phenyl-9H-carbazol-3-yl)triphenylamine (abbreviation: PCBBi1BP), 4-(1-Naphthyl)-4'-(9-phenyl-9H-carbazol-3-yl)triphenylamine (abbreviation: PCBANB), 4,4'-Di(1-naphthyl)-4''-(9-phenyl-9H-carbazol-3-yl)triphenylamine (abbreviation: PCBNBB), 4-Phenyldiphenyl-(9-phenyl-9H-carbazol-3-yl)amine (abbreviation: PCA1BP), N,N'-Bis(9-phenylcarbazol-3-yl)-N,N'-diphenylbenzene-1,3-diamine (abbreviation: PCA2B), N,N',N''-Triphenyl-N,N',N''-tris(9-phenylcarbazol-3-yl)benzene-1,3,5-triamine (abbreviation: PCA3B), 9,9-Dimethyl-N-phenyl-N-[4-(9-phenyl-9H-carbazol-3-yl)phenyl]fluoren-2-amine (abbreviation: PCBAF),N-Phenyl-N-[4-(9-phenyl-9H-carbazol-3-yl)phenyl]spiro-9,9'-bifluoren-2-amine (abbreviation: PCBASF), 3-[N-(9-Phenylcarbazol-3-yl)-N-phenylamino]-9-phenylcarbazole (abbreviation: PCzPCA1), 3,6-Bis[N-(9-phenylcarbazol-3-yl)-N-phenylamino]-9-phenylcarbazole (abbreviation: PCzPCA2), 3-[N-(1-Naphthyl)-N-(9-phenylcarbazol-3-yl)amino]-9-phenylcarbazole (abbreviation: PCzPCN1), 3-[N-(4-Diphenylaminophenyl)-N-phenylamino]-9-phenylcarbazole (abbreviation: PCzDPA1), 3,6-Bis[N-(4-diphenylaminophenyl)-N-phenylamino]-9-phenylcarbazole (abbreviation: PCzDPA2), 3,6-Bis[N-(4-diphenylaminophenyl)-N-(1-naphthyl)amino]-9-phenylcarbazole (abbreviation: PCzTPN2), 2-[N-(9-phenylcarbazol-3-yl)-N-phenylamino]spiro-9,9'-bifluorene (abbreviation: PCASF), N-[4-(9H-carbazol-9-yl)phenyl]-N-(4-phenyl)phenylaniline (abbreviation: YGA1BP), N,N'-Bis[4-(carbazol-9-yl)phenyl]-N,N'-diphenyl-9,9-dimethylfluorene-2,7-diamine (abbreviation: YGA2F) and 4,4',4''-Tris(carbazol-9-yl)triphenylamine (abbreviation: TCTA). Other examples of the carbazole derivative include 3-[4-(9-Phenanthryl)phenyl]-9-phenyl-9H-carbazole (abbreviation: PCPPn), 3-[4-(1-Naphthyl)phenyl]-9-phenyl-9H-carbazole (abbreviation: PCPN), 1,3-Bis(N-carbazolyl)benzene (abbreviation: mCP), 4,4'-Di(N-carbazolyl)biphenyl (abbreviation: CBP), 3,6-Bis(3,5-diphenylphenyl)-9-phenylcarbazole (abbreviation: CzTP), 1,3,5-Tris[4-(N-carbazolyl)phenyl]benzene (abbreviation: TCPB) and 9-[4-(10-Phenyl-9-anthracenyl)phenyl]-9H-carbazole (abbreviation: CzPA). Specific examples of the aforementioned furan derivative (the compound with a furan framework) include compounds with a thiophene framework, such as... B. 4,4',4''-(Benzene-1,3,5-triyl)tri(dibenzothiophene) (abbreviation: DBT3P-II), 2,8-Diphenyl-4-[4-(9-phenyl-9H-fluoren-9-yl)phenyl]dibenzothiophene (abbreviation: DBTFLP-III) and 4-[4-(9-Phenyl-9H-fluoren-9-yl)phenyl]-6-phenyldibenzothiophene (abbreviation: DBTFLP-IV), 4,4',4''-(Benzene-1,3,5-triyl)tri(dibenzofuran) (abbreviation: DBF3P-II) and 4-{3-[3-(9-Phenyl-9H-fluoren-9-yl)phenyl]phenyl}dibenzofuran (abbreviation: mmDBFFLBi-II). Specific examples of the aforementioned aromatic amine include 4,4'-bis[N-(1-naphthyl)-N-phenylamino]biphenyl (abbreviation: NPB or α-NPD), N,N'-bis(3-methylphenyl)-N,N'-diphenyl-[1,1'-biphenyl]-4,4'-diamine (abbreviation: TPD), 4,4'-bis[N-(spiro-9,9'-bifluoren-2-yl)-N-phenylamino]biphenyl (abbreviation: BSPB), 4-phenyl-4'-(9-phenylfluoren-9-yl)triphenylamine (abbreviation: BPAFLP), 4-phenyl-3'-(9-phenylfluoren-9-yl)triphenylamine (abbreviation: mBPAFLP), N-(9,9-Dimethyl-9H-fluoren-2-yl)-N-{9,9-dimethyl-2-[N'-phenyl-N'-(9,9-dimethyl-9H-fluoren-2-yl)amino]-9H-fluoren-7-yl}phenylamine (abbreviation: DFLADFL), N-(9,9-Dimethyl-2-diphenylamino-9H-fluoren-7-yl)diphenylamine (abbreviation: DPNF), 2-[N-(4-Diphenylaminophenyl)-N-phenylamino]spiro-9,9'-bifluorene (abbreviation: DPASF), 2,7-Bis[N-(4-diphenylaminophenyl)-N-phenylamino]spiro-9,9'-bifluorene (abbreviation: DPA2SF), 4,4',4''-Tris[N-(1-naphthyl)-N-phenylamino]triphenylamine (abbreviation: 1'-TNATA), 4,4',4''-Tris(N,N-diphenylamino)triphenylamine (abbreviation: TDATA),4,4',4''-Tris[N-(3-methylphenyl)-N-phenylamino]triphenylamine (abbreviation: m-MTDATA), N,N'-Di(p-tolyl)-N,N'-diphenyl-p-phenylenediamine (abbreviation: DTDPPA), 4,4'-Bis[N-(4-diphenylaminophenyl)-N-phenylamino]biphenyl (abbreviation: DPAB), 4,4'-Bis(N-{4-[N,N-bis(3-methylphenyl)amino]phenyl}-N-phenylamino)biphenyl (abbreviation: DNTPD) and 1,3,5-Tris[N-(4-diphenylaminophenyl)-N-phenylamino]benzene (abbreviation: DPA3B)., A high molecular weight compound, such as poly(N-vinylcarbazole) (abbreviation: PVK), poly(4-vinyltriphenylamine) (abbreviation: PVTPA), poly[N-(4-{N'-[4-(4-diphenylamino)phenyl]phenyl-N'-phenylamino}phenyl)methacrylamide] (abbreviation: PTPDMA) or poly[N,N'-bis(4-butylphenyl)-N,N'-bis(phenyl)benzidine] (abbreviation: poly-TPD), can be used as the hole transport material. It should be noted that the hole transport material is not limited to the above examples and any of the various known materials can be used alone or in combination as the hole transport material. The acceptor material used for the hole injection layer 111 can be an oxide of a metal belonging to one of groups 4 to 8 of the periodic table. Specific examples include molybdenum oxide, vanadium oxide, niobium oxide, tantalum oxide, chromium oxide, tungsten oxide, manganese oxide, and rhenium oxide. Among these, molybdenum oxide is particularly preferred because it is stable in air, has low hygroscopic properties, and is easy to handle. It is also possible to use any of the aforementioned organic acceptor materials. The hole injection layer 111 can be formed by any of the known deposition methods, such as a vacuum evaporation process. <lochtransportschicht> The hole transport layer 112 transports holes injected from the first electrode 101 through the hole injection layer 111 to the light-emitting layer 113. The hole transport layer 112 contains a hole transport material. Therefore, the hole transport layer 112 can be formed using a hole transport material that can be used for the hole injection layer 111. It should be noted that in the light-emitting device of one embodiment of the present invention, the same organic compound as that used for the hole transport layer 112 is preferably used for the light-emitting layer 113. This is because using the same organic compounds for both the hole transport layer 112 and the light-emitting layer 113 allows holes to be efficiently transported from the hole transport layer 112 to the light-emitting layer 113. <Licht emittierende Schicht> The light-emitting layer 113 contains a light-emitting substance. The light-emitting layer 113 of the light-emitting device of an embodiment of the present invention contains a host material and guest materials. The third organic compound 123 is used as the host material, and the first organic compound 121 (the fluorescent substance), which has a function for converting singlet excitation energy into light emission, and the second organic compound 122 (the phosphorescent substance or the TADF material), which has a function for converting triplet excitation energy into light emission, are used as guest materials.It should be noted that a light-emitting substance that can be used in the light-emitting layer 113 is not particularly restricted as long as the above condition is met, and that a substance whose emission color is blue, violet, blue-violet, green, yellow-green, yellow, orange, red or the like may be used in a suitable manner. It should be noted that two or more types of organic compounds can be used as host materials for the light-emitting layer 113; alternatively, an exciplex formed by these compounds can be used. The third organic compound 123 used as a host material is preferably a substance having an energy gap larger than that of the first organic compound 121 and that of the second organic compound 122, which are used as guest materials. It is preferable that the lowest singlet excitation energy level (S1 level) of the third organic compound 123 is higher than the S1 level of the first organic compound 121, and that the lowest triplet excitation energy level (T1 level) of the third organic compound 123 is higher than the T1 level of the first organic compound 121.It is preferable that the T1 level of the third organic compound 123 is higher than the T1 level of the second organic compound 122. An organic compound, such as the hole transport material that can be used in hole transport layer 112, or an electron transport material to be described below that can be used in electron transport layer 114, or an exciplex formed by two or more types of organic compounds, can be used as one or more types of organic compounds, as long as requirements for the host material used in the light-emitting layer are met. An exciplex whose excitation state is formed by two or more types of organic compounds has a very small difference between the S1 level and the T1 level and serves as a TADF material that can convert triplet excitation energy into singlet excitation energy.As an example of a combination of two or more types of organic compounds forming an exciplex, it is preferred that one of the two or more types of organic compounds has a π-electron-deficient heteroaromatic ring and the other has a π-electron-rich heteroaromatic ring. A phosphorescent substance, such as an iridium-, rhodium-, or platinum-based organometallic complex or a metal complex, can be used as one of the combinations forming an exciplex. It should be noted that the first organic compound 121 and the second organic compound 122, which are used as guest materials of the light-emitting layer 113, preferably have different emission colors. Alternatively, complementary emission colors can be combined to obtain white light emission. In the combination that meets the requirements for the guest materials used in the light-emitting layer, the material described in embodiment 2 can be used as the first organic compound 121, which is the first guest material of the light-emitting layer 113 and has a function for converting singlet excitation energy into light emission. Examples of the second organic compound 122, which is the second guest material of the light-emitting layer 113 and has a function for converting triplet excitation energy into light emission, include a substance that emits phosphorescence (a phosphorescent material) and a thermally activated delayed fluorescent (TADF) material that emits thermally activated delayed fluorescence.Any one of these materials can be used similarly in the combination that meets the requirements for the guest materials used in the light-emitting layer. The lowest singlet excitation energy level (S1 level) of the first organic compound 121 is higher than the T1 level of the second organic compound 122. This means that a peak wavelength in the emission spectrum of light emitted by the second organic compound 122 is longer than that in the emission spectrum of light emitted by the first organic compound 121. A phosphorescent substance is a compound that emits phosphorescence, but no fluorescence, at temperatures above or equal to a low temperature (e.g., 77 K) and below or equal to room temperature (i.e., above or equal to 77 K and below or equal to 313 K). The phosphorescent substance preferably contains a metal element with a high spin-orbit interaction and may, for example, be an organometallic complex, a metal complex (platinum complex), or a rare-earth metal complex. In particular, the phosphorescent substance preferably contains a transition metal element.It is particularly preferred that the phosphorescent substance contains a platinum group element (ruthenium (Ru), rhodium (Rh), palladium (Pd), osmium (Os), iridium (Ir) or platinum (Pt)), in particular iridium, in which case the probability of the direct transition between the singlet ground state and the triplet excitation state can be increased. Examples of phosphorescent materials that emit blue or green light and whose emission spectrum has a peak wavelength greater than or equal to 450 nm and less than or equal to 570 nm include the following substances. For example, organometallic complexes with a 4H-triazole backbone, such as... B. Tris{2-[5-(2-methylphenyl)-4-(2,6-dimethylphenyl)-4H-1,2,4-triazol-3-yl-κN2]phenyl-κC}iridium(III) (abbreviation: [Ir(mpptz-dmp)3]), Tris(5-methyl-3,4-diphenyl-4H-1,2,4-triazolato)iridium(III) (abbreviation: [Ir(Mptz)3]), Tris[4-(3-biphenyl)-5-isopropyl-3-phenyl-4H-1,2,4-triazolato]iridium(III) (abbreviation: [Ir(iPrptz-3b)3]) and Tris[3-(5-biphenyl)-5-isopropyl-4-phenyl-4H-1,2,4-triazolato]iridium(III) (abbreviation: [Ir(iPr5btz)3]), organometallic complexes with a 1H-triazole skeleton, such as Tris[3-methyl-1-(2-methylphenyl)-5-phenyl-1H-1,2,4-triazolato]iridium(III) (abbreviation: [Ir(Mptz1-mp)3]) and Tris(1-methyl-5-phenyl-3-propyl-1H-1,2,4-triazolato)iridium(III) (abbreviation: [Ir(Prptz1-Me)3]), organometallic complexes with an imidazole skeleton, such asfac-Tris[1-(2,6-diisopropylphenyl)-2-phenyl-1 H-imidazole]iridium(III) (abbreviation: [Ir(iPrpmi)3]) and Tris[3-(2,6-dimethylphenyl)-7-methylimidazo[1,2-f]phenanthridinato]iridium(III) (abbreviation: [Ir(dmpimpt-Me)3]), and organometallic complexes in which a phenylpyridine derivative with an electron-withdrawing group is a ligand, such as e.g. B. Bis[2-(4',6'-difluorophenyl)pyridinato-N,C2']iridium(III)tetrakis(1-pyrazolyl)borate (abbreviation: Flr6), Bis[2-(4',6'-difluorophenyl)pyridinato-N,C2']iridium(III)picolinate (abbreviation: Flrpic), Bis{2-[3',5'-bis(trifluoromethyl)phenyl]pyridinato-N,C2'}iridium(III)picolinate (abbreviation: [Ir(CF3ppy)2(pic)]) and Bis[2-(4',6'-difluorophenyl)pyridinato-N,C2']iridium(III)acetylacetonate (abbreviation: Flr(acac)). Examples of phosphorescent substances that emit green or yellow light and whose emission spectrum has a peak wavelength greater than or equal to 495 nm and less than or equal to 590 nm include the following substances. Examples of the phosphorescent substance include organometallic iridium complexes with a pyrimidine backbone, such as... B. Tris(4-methyl-6-phenylpyrimidinato)iridium(III) (abbreviation: [Ir(mppm)3]), Tris(4-t-butyl-6-phenylpyrimidinato)iridium(III) (abbreviation: [Ir(tBuppm)3]), (Acetylacetonato)bis(6-methyl-4-phenylpyrimidinato)iridium(III) (abbreviation: [Ir(mppm)2(acac)]), (Acetylacetonato)bis(6-tert-butyl-4-phenylpyrimidinato)iridium(III) (abbreviation: [Ir(tBuppm)2(acac)]), (Acetylacetonato)bis[6-(2-norbornyl)-4-phenylpyrimidinato]iridium(III) (abbreviation: [Ir(nbppm)2(acac)]), (Acetylacetonato)bis[5-methyl-6-(2-methylphenyl)-4-phenylpyrimidinato]iridium(III) (abbreviation: [Ir(mpmppm)2(acac)]), (Acetylacetonato)bis {4,6-dimethyl-2-[6-(2,6-dimethylphenyl)-4-pyrimidinyl-κN3]phenyl-κC}iridium(III) (abbreviation: [Ir(dmppm-dmp)2(acac)]) and (Acetylacetonato)bis(4,6-diphenylpyrimidinato)iridium(III) (abbreviation: [Ir(dppm)2(acac)]), organometallic iridium complexes with a pyrazine framework, such as(Acetylacetonato)bis(3,5-dimethyl-2-phenylpyrazinato)iridium(III) (abbreviation: [Ir(mppr-Me)2(acac)]) and (Acetylacetonato)bis(5-isopropyl-3-methyl-2-phenylpyrazinato)iridium(III) (abbreviation: [Ir(mppr-iPr)2(acac)]), organometallic iridium complexes with a pyridine backbone, such as... B. Tris(2-phenylpyridinato-N,C2')iridium(III) (abbreviation: [Ir(ppy)3]), Bis(2-phenylpyridinato-N,C2')iridium(III)acetylacetonate (abbreviation: [Ir(ppy)2(acac)]), Bis(benzo[h]quinolinato)iridium(III)acetylacetonate (abbreviation: [Ir(bzq)2(acac)]), Tris(benzo[h]quinolinato)iridium(III) (abbreviation: [Ir(bzq)3]), Tris(2-phenylquinolinato-N,C2')iridium(III) (abbreviation: [Ir(pq)3]), Bis(2-phenylquinolinato-N,C2')iridium(III)acetylacetonate (abbreviation: [Ir(pq)2(acac)]), Bis[2-(2-pyridinyl-κN)phenyl-κC][2-(4-phenyl-2-pyridinyl-κN)phenyl-κC]iridium(III) (abbreviation: [Ir(ppy)2(4dppy)]) and Bis[2-(2-pyridinyl-κN)phenyl-κC][2-(4-methyl-5-phenyl-2-pyridinyl-κN)phenyl-κC], organometallic complexes, such asBis(2,4-diphenyl-1,3-oxazolato-N,C2')iridium(III)acetylacetonate (abbreviation: [Ir(dpo)2(acac)]), Bis{2-[4'-(perfluorophenyl)phenyl]pyridinato-N,C2'}iridium(III)acetylacetonate (abbreviation: [Ir(p-PF-ph)2(acac)]) and Bis(2-phenylbenzothiazolato-N,C2')iridium(III)acetylacetonate (abbreviation: [Ir(bt)2(acac)]), and a rare earth metal complex, such as Tris(acetylacetonato)(monophenanthroline)terbium(III) (abbreviation: [Tb(acac)3(Phen)]). Examples of phosphorescent substances that emit yellow or red light and whose emission spectrum has a peak wavelength greater than or equal to 570 nm and less than or equal to 750 nm include the following substances. Examples include organometallic complexes with a pyrimidine framework, such as (diisobutyrylmethanato)bis[4,6-bis(3-methylphenyl)pyrimidinato]iridium(III) (abbreviation: [Ir(5mdppm)2(dibm)]), bis[4,6-bis(3-methylphenyl)pyrimidinato](dipivaloylmethanato)iridium(III) (abbreviation: [Ir(5mdppm)2(dpm)]) and (dipivaloylmethanato)bis[4,6-di(naphthalen-1-yl)pyrimidinato]iridium(III) (abbreviation: [Ir(d1npm)2(dpm)]), organometallic complexes with a pyrazine framework, such as... B. (Acetylacetonato)bis(2,3,5-triphenylpyrazinato)iridium(III) (abbreviation: [Ir(tppr)2(acac)]), Bis(2,3,5-triphenylpyrazinato)(dipivaloylmethanato)iridium(III) (abbreviation: [Ir(tppr)2(dpm)]), Bis{4,6-dimethyl-2-[3-(3,5-dimethylphenyl)-5-phenyl-2-pyrazinyl-κN] phenyl-κC}(2,6-dimethyl-3,5-heptanedionato-κ2O,O')iridium(III) (abbreviation: [Ir(dmdppr-P)2(dibm)]), Bis{4,6-dimethyl-2-[5-(4-cyano-2,6-dimethylphenyl)-3-(3,5-dimethylphenyl)-2-pyrazinyl-κN]phenyl-κC}(2,2,6,6-tetramethyl-3,5-heptanedionato-κ2O,O')iridium(III) (abbreviation: [Ir(dmdppr-dmCP)2(dpm)]), Bis[2-(5-(2,6-dimethylphenyl)-3-(3,5-dimethylphenyl)-2-pyrazinyl-κN)-4,6-dimethylphenyl-κC](2,2',6,6'-tetramethyl-3,5-heptanedionato-κ2O,O')iridium(III) (abbreviation: [Ir(dmdppr-dmp)2(dpm)]), (Acetylacetonato)bis[2-methyl-3-phenylquinoxalinato-N,C2']iridium(III) (abbreviation: [Ir(mpq)2(acac)]), (Acetylacetonato)bis(2,3-diphenylquinoxalinato-N,C2')iridium(III) (abbreviation: [Ir(dpq)2(acac)]) and (acetylacetonato)bis[2,3-bis(4-fluorophenyl)quinoxalinato]iridium(III) (abbreviation: [Ir(Fdpq)2(acac)]), organometallic complexes with a pyridine skeleton, such as e.g. B. Tris(1-phenylisoquinolinato-N,C2')iridium(III) (abbreviation: [Ir(piq)3]), Bis(1-phenylisoquinolinato-N,C2')iridium(III)acetylacetonate (abbreviation: [Ir(piq)2(acac)]) and Bis[4,6-dimethyl-2-(2-quinolinyl-κN)phenyl-κC](2,4-pentanedionato-κ2O,O')iridium(1Il) (abbreviation: [Ir(dmpqn)2(acac)]), a platinum complex, such as 2,3,7,8,12,13,17,18-octaethyl-21H,23H-porphyrinplatin(II) (abbreviation: [PtOEP]), and rare earth metal complexes, such as Tris(1,3-diphenyl-1,3-propanediumato)(monophenanthroline)europium(III) (abbreviation: [Eu(DBM)3(Phen)]) and Tris[1-(2-thenoyl)-3,3,3-trifluoroacetonato](monophenanthroline)europium(III) (abbreviation: [Eu(TTA)3(Phen)]). Any of the materials described below can be used as the TADF material. The TADF material is a material that has a small difference between its S1 level and its T1 level (preferably less than or equal to 0.2 eV), that can up-convert a triplet excitation state to a singlet excitation state (i.e., reverse intersystem crossing is thus possible) using little thermal energy, and that efficiently emits light (fluorescence) from the singlet excitation state. The thermally activated delayed fluorescence is efficiently obtained under the following condition: The energy difference between the triplet excitation energy level and the singlet excitation energy level is greater than or equal to 0 eV and less than or equal to 0.2 eV, preferably greater than or equal to 0 eV and less than or equal to 0.1 eV.It should be noted that delayed fluorescence of the TADF material refers to light emission that has the same spectrum as normal fluorescence and a very long lifetime. The lifetime is 1 × 10⁻⁶ seconds or longer, preferably 1 × 10⁻³ seconds or longer. Examples of TADF material include fullerene, a derivative thereof, an acridine derivative such as proflavin, and eosin. Other examples include a metal-containing porphyrin, such as a porphyrin containing magnesium (Mg), zinc (Zn), cadmium (Cd), tin (Sn), platinum (Pt), indium (In), or palladium (Pd). Examples of metal-containing porphyrins include a protoporphyrin tin fluoride complex (abbreviation: SnF2(Proto IX)), a mesoporphyrin tin fluoride complex (abbreviation: SnF2(Meso IX)), a hematoporphyrin tin fluoride complex (abbreviation: SnF2(Hämato IX)), a coproporphyrin tetramethyl ester tin fluoride complex (abbreviation: SnF2(Copro III-4Me)), an octaethylporphyrin tin fluoride complex (abbreviation: SnF2(OEP)), an etioporphyrin tin fluoride complex (abbreviation: SnF2(Etio I)) and an octaethylporphyrin platinum chloride complex (abbreviation: PtCl2OEP). Alternatively, a heterocyclic compound with a π-electron-rich heteroaromatic ring and a π-electron-poor heteroaromatic ring, such as e.g.2-(Biphenyl-4-yl)-4,6-bis(12-phenylindolo[2,3-a]carbazol-11-yl)-1,3,5-triazine (abbreviation: PIC-TRZ), 2-{4-[3-(N-phenyl-9H-carbazol-3-yl)-9H-carbazol-9-yl]phenyl}-4,6-diphenyl-1,3,5-triazine (abbreviation: PCCzPTzn), 2-[4-(10H-phenoxazin-10-yl)phenyl]-4,6-diphenyl-1,3,5-triazine (abbreviation: PXZ-TRZ), 3-[4-(5-phenyl-5,10-dihydrophenazin-10-yl)phenyl]-4,5-diphenyl-1,2,4-triazole (abbreviation: PPZ-3TPT), 3-(9,9-Dimethyl-9H-acridin-10-yl)-9H-xanthen-9-one (abbreviation: ACRXTN), Bis[4-(9,9-dimethyl-9,10-dihydroacridin)phenyl]sulfone (abbreviation: DMAC-DPS), 10-Phenyl-10H,10'H-spiro[acridin-9,9'-anthracene]-10'-one (abbreviation: ACRSA), 4-(9'-Phenyl-3,3'-bi-9H-carbazol-9-yl)benzofuro[3,2-d]pyrimidine (abbreviation: 4PCCzBfpm), 4-[4-(9'-Phenyl-3,3'-bi-9H-carbazol-9-yl)phenyl]benzofuro[3,2-d]pyrimidine (abbreviation: 4PCCzPBfpm) or 9-[3-(4,6-Diphenyl-1,3,5-triazin-2-yl)phenyl]-9'-phenyl-2,3'-bi-9H-carbazole (abbreviation: mPCCzPTzn-02). It should be noted that a substance in which a π-electron-rich heteroaromatic ring is directly bonded to a π-electron-poor heteroaromatic ring is particularly preferred, since both the donor property of the π-electron-rich heteroaromatic ring and the acceptor property of the π-electron-poor heteroaromatic ring are improved, and the energy difference between the singlet excitation state and the triplet excitation state becomes small. In addition to the substances described above, a second organic compound 122, which is a material with a function for converting triplet excitation energy into light emission, can be described as a nanostructure of a transition metal compound with a perovskite structure. In particular, a nanostructure of a metal halide perovskite material is preferred. The nanostructure is preferably a nanoparticle or a nanorod. In addition to the substances described above, the following substances, which emit fluorescence (fluorescent substances), can be given as examples of light-emitting substances that convert the singlet excitation energy into light emission and can be used as a light-emitting layer 113: a pyrene derivative, an anthracene derivative, a triphenylene derivative, a fluorene derivative, a carbazole derivative, a dibenzothiophene derivative, a dibenzofuran derivative, a dibenzoquinoxaline derivative, a quinoxaline derivative, a pyridine derivative, a pyrimidine derivative, a phenanthrene derivative, and a naphthalene derivative. A pyrene derivative is particularly preferred because it has a high emission quantum yield.Specific examples of pyrene derivatives include N,N'-bis(3-methylphenyl)-N,N'-bis[3-(9-phenyl-9H-fluoren-9-yl)phenyl]pyrene-1,6-diamine (abbreviation: 1,6mMemFLPAPrn), N,N'-diphenyl-N,N'-bis[4-(9-phenyl-9H-fluoren-9-yl)phenyl]pyrene-1,6-diamine (abbreviation: 1,6FLPAPrn), N,N'-bis(dibenzofuran-2-yl)-N,N'-diphenylpyrene-1,6-diamine (abbreviation: 1,6FrAPrn), N,N'-bis(dibenzothiophene-2-yl)-N,N'-diphenylpyrene-1,6-diamine (abbreviation: 1,6ThAPrn), N,N'-(pyrene-1,6-diyl)bis[(N-phenylbenzo[b]naphtho[1,2-d]furan)-6-amine] (abbreviation: 1,6BnfAPrn), N,N'-(pyrene-1,6-diyl)bis[(N-phenylbenzo[b]naphtho[1,2-d]furan)-8-amine] (abbreviation: 1,6BnfAPrn-02) and N,N'-(pyrene-1,6-diyl)bis[(6,N-diphenylbenzo[b]naphtho[1,2-d]furan)-8-amine] (abbreviation: 1,6BnfAPrn-03). Furthermore, it is possible to obtain 5,6-Bis[4-(10-phenyl-9-anthryl)phenyl]-2,2'-bipyridine (abbreviation: PAP2BPy), 5,6-Bis[4'-(10-phenyl-9-anthryl)biphenyl-4-yl]-2,2'-bipyridine (abbreviation: PAPP2BPy), N,N'-Bis[4-(9H-carbazol-9-yl)phenyl]-N,N'-diphenylstilbene-4,4'-diamine (abbreviation: YGA2S), 4-(9H-carbazol-9-yl)-4'-(10-phenyl-9-anthryl)triphenylamine (abbreviation: YGAPA), 4-(9H-carbazol-9-yl)-4'-(9,10-diphenyl-2-anthryl)triphenylamine (abbreviation: 2YGAPPA), N,9-Diphenyl-N-[4-(10-phenyl-9-anthryl)phenyl]-9H-carbazol-3-amine (abbreviation: PCAPA), 4-(10-phenyl-9-anthryl)-4'-(9-phenyl-9H-carbazol-3-yl)triphenylamine (abbreviation: PCBAPA), 4-[4-(10-phenyl-9-anthryl)phenyl]-4'-(9-phenyl-9H-carbazol-3-yl)triphenylamine (abbreviation: PCBAPBA), Perylene, 2,5,8,11-Tetra(tert-butyl)perylene (abbreviation: TBP), N,N''-(2-tert-Butylanthracene-9,10-diyldi-4,1-phenylene)bis[N,N',N'-triphenyl-1,4-phenylenediamine] (abbreviation: DPABPA), N,9-Diphenyl-N-[4-(9,10-diphenyl-2-anthryl)phenyl]-9H-carbazol-3-amine (abbreviation: 2PCAPPA), N-[4-(9,to use 10-Diphenyl-2-anthryl)phenyl]-N,N',N'-triphenyl-1,4-phenylenediamine (abbreviation: 2DPAPPA) or the like. Examples of the third organic compound 123, which is the host material of the light-emitting layer 113, include condensed polycyclic aromatic compounds, such as an anthracene derivative, a tetracene derivative, a phenanthrene derivative, a pyrene derivative, a chrysene derivative and a dibenzo[g,p]chrysene derivative. Specific examples of the above compound include 9-phenyl-3-[4-(10-phenyl-9-anthryl)phenyl]-9H-carbazole (abbreviation: PCzPA), 3,6-diphenyl-9-[4-(10-phenyl-9-anthryl)phenyl]-9H-carbazole (abbreviation: DPCzPA), 3-[4-(1-naphthyl)phenyl]-9-phenyl-9H-carbazole (abbreviation: PCPN), 9,10-diphenylanthracene (abbreviation: DPAnth), N,N-diphenyl-9-[4-(10-phenyl-9-anthryl)phenyl]-9H-carbazol-3-amine (abbreviation: CzA1PA), 4-(10-phenyl-9-anthryl)triphenylamine (abbreviation: DPhPA), YGAPA, PCAPA, N,9-Diphenyl-N-{4-[4-(10-phenyl-9-anthryl)phenyl]phenyl}-9H-carbazol-3-amine (abbreviation: PCAPBA), N-(9,10-Diphenyl-2-anthryl)-N,9-diphenyl-9H-carbazol-3-amine (abbreviation: 2PCAPA), 6,12-Dimethoxy-5,11-diphenylchrysene, N,N,N,N,N',N'',N''',N'''-Octaphenyldibenzo[g,p]chrysene-2,7,10,15-tetraamine (abbreviation: DBC1), 9-[4-(10-Phenyl-9-anthracenyl)phenyl]-9H-carbazole (abbreviation: CzPA), 7-[4-(10-Phenyl-9-anthryl)phenyl]-7H-dibenzo[c,g]carbazole (abbreviation: cgDBCzPA), 6-[3-(9,10-Diphenyl-2-anthryl)phenyl]benzo[b]naphtho[1,2-d]furan (abbreviation: 2mBnfPPA), 9-Phenyl-10-{4-(9-phenyl-9H-fluoren-9-yl)biphenyl-4'-yl}anthracene (abbreviation: FLPPA), 9,10-Bis(3,5-diphenylphenyl)anthracene (abbreviation: DPPA), 9,10-Di(2-naphthyl)anthracene (abbreviation: DNA), 2-tert-Butyl-9,10-di(2-naphthyl)anthracene (abbreviation: t-BuDNA), 9,9'-Bianthryl (abbreviation: BANT), 9,9'-(Stilben-3,3'-diyl)diphenanthrene (abbreviation: DPNS) 9,9'-(Stilben-4,4'-diyl)diphenanthrene (abbreviation: DPNS2), 1,3,5-Tri(1-pyrenyl)benzene (abbreviation: TPB3), 5,12-Diphenyltetracene and 5,12-Bis(biphenyl-2-yl)tetracene. In addition to the examples described above, a third organic compound 123, which is the host material of the light-emitting layer 113, may be an aromatic amine, a carbazole derivative, a dibenzothiophene derivative, a dibenzofuran derivative, a zinc or aluminum-based metal complex, an oxadiazole derivative, a triazole derivative, a benzimidazole derivative, a quinoxaline derivative, a dibenzoquinoxaline derivative, a pyrimidine derivative, a pyrazine derivative, a triazine derivative, a pyridine derivative, a bipyridine derivative, a phenanthroline derivative, or the like. Specific examples include 2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (abbreviation: PBD), 1,3-bis[5-(p-tert-butylphenyl)-1,3,4-oxadiazol-2-yl]benzene (abbreviation: OXD-7), 9-[4-(5-phenyl-1,3,4-oxadiazol-2-yl)phenyl]-9H-carbazole (abbreviation: CO11), triazole derivatives, such as... B. 3-(4-Biphenylyl)-4-phenyl-5-(4-tert-butylphenyl)-1,2,4-triazole (abbreviation: TAZ) and 3-(4-tert-Butylphenyl)-4-(4-ethylphenyl)-5-(4-biphenylyl)-1,2,4-triazole (abbreviation: p-EtTAZ), 2,2',2''-(1,3,5-Benzenetriyl)tris(1-phenyl-1H-benzimidazole) (abbreviation: TPBI), 2-[3-(Dibenzothiophen-4-yl)phenyl]-1-phenyl-1H-benzimidazole (abbreviation: mDBTBIm-II), 4,4'-Bis(5-methylbenzoxazol-2-yl)stilbene (abbreviation: BzOS), Bathophenanthroline (abbreviation: Bphen), Bathocuproin (abbreviation: BCP), 2,9-Bis(naphthalen-2-yl)-4,7-diphenyl-1,10-phenanthroline (abbreviation: NBphen), and quinoxaline derivatives and dibenzoquinoxaline derivatives, such as2-[3-(Dibenzothiophen-4-yl)phenyl]dibenzo[f,h]quinoxaline (abbreviation: 2mDBTPDBq-II), 2-[3'-(Dibenzothiophen-4-yl)biphenyl-3-yl]dibenzo[f,h]quinoxaline (abbreviation: 2mDBTBPDBq-II), 2-[3'-(9H-Carbazol-9-yl)biphenyl-3-yl]dibenzo[f,h]quinoxaline (abbreviation: 2mCzBPDBq), 2-[4-(3,6-Diphenyl-9H-carbazol-9-yl)phenyl]dibenzo[f,h]quinoxaline (abbreviation: 2CzPDBq-III), 7-[3-(Dibenzothiophen-4-yl)phenyl]dibenzo[f,h]quinoxaline (abbreviation: 7mDBTPDBq-II) and 6-[3-(Dibenzothiophen-4-yl)phenyl]dibenzo[f,h]quinoxaline (abbreviation: 6mDBTPDBq-II). Other examples include pyrimidine derivatives, such as 4,6-bis[3-(phenanthren-9-yl)phenyl]pyrimidine (abbreviation: 4,6mPnP2Pm), 4,6-bis[3-(4-dibenzothienyl)phenyl]pyrimidine (abbreviation: 4,6mDBTP2Pm-II) and 9,9'-(pyrimidine-4,6-diyldi-3,1-phenylene)bis(9H-carbazole) (abbreviation: 4,6mCzP2Pm), triazine derivatives, such as... B. 2-{4-[3-(N-Phenyl-9H-carbazol-3-yl)-9H-carbazol-9-yl]phenyl}-4,6-diphenyl-1,3,5-triazine (abbreviation: PCCzPTzn) and 9-[3-(4,6-Diphenyl-1,3,5-triazine-2-yl)phenyl]-9'-phenyl-2,3'-bi-9H-carbazole (abbreviation: mPCCzPTzn-02), and pyridine derivatives, such as 3,5-Bis[3-(9H-carbazol-9-yl)phenyl]pyridine (abbreviation: 35DCzPPy) and 1,3,5-Tri[3-(3-pyridyl)phenyl]benzene (abbreviation: TmPyPB). As another alternative, a high molecular weight compound such as poly(2,5-pyridindiyl) (abbreviation: PPy), poly[(9,9-dihexylfluorene-2,7-diyl)-co-(pyridine-3,5-diyl)] (abbreviation: PF-Py) or poly[(9,9-dioctylfluorene-2,7-diyl)-co-(2,2'-bipyridine-6,6'-diyl)] (abbreviation: PF-BPy) can be used. <elektronentransportschicht> The electron transport layer 114 transports electrons injected from the second electrode 102 through the electron injection layer 115 to the light-emitting layer 113. It should be noted that the electron transport layer 114 contains an electron transport material. It is preferable that the electron transport material contained in the electron transport layer 114 be a substance with an electron mobility greater than or equal to 1 × 10⁻⁶ cm² / Vs in the case where the square root of the electric field strength [V / cm] is 600. It should be noted that any other substance can also be used, as long as the substance transports electrons more readily than it transports holes.The electron transport layers 114, 114a and 114b each also function with a single-layer structure; however, if the electron transport layer 114 has a multi-layer structure with two or more layers as required, the device properties can be improved. Examples of an organic compound that can be used for the electron transport layer 114 include materials with high electron transport properties (electron transport materials), such as... B. an organic compound with a structure in which an aromatic ring is fused to a furan ring of a furodiazine skeleton, a metal complex with a quinoline skeleton, a metal complex with a benzoquinoline skeleton, a metal complex with an oxazole skeleton, a metal complex with a thiazole skeleton, an oxadiazole derivative, a triazole derivative, an imidazole derivative, an oxazole derivative, a thiazole derivative, a phenanthroline derivative, a quinoline derivative with a quinoline ligand, a benzoquinoline derivative, a quinoxaline derivative, a dibenzoquinoxaline derivative, a pyridine derivative, a bipyridine derivative, a pyrimidine derivative and a π-electron-deficient heteroaromatic compound (e.g. a nitrogen-containing heteroaromatic compound). Specific examples of the electron transport material include metal complexes with a quinoline framework or a benzoquinoline framework, such as... B. 2-[3'-(Dibenzothiophen-4-yl)biphenyl-3-yl]dibenzo[f,h]quinoxaline (abbreviation: 2mDBTBPDBq-II), 2-[3'-(Dibenzothiophen-4-yl)biphenyl-3-yl]dibenzo[f,h]quinoxaline (abbreviation: 2mDBTBPDBq-II), 5-[3-(4,6-Diphenyl-1,3,5-triazin-2-yl)phenyl]-7,7-dimethyl-5H,7H-indeno[2,1-b]carbazole (abbreviation: mlNc(II)PTzn), 4-[3-(Dibenzothiophen-4-yl)phenyl]-8-(naphthalen-2-yl)-[1]benzofuro[3,2-d]pyrimidine (abbreviation: 8βN-4mDBtPBfpm), 3,8-Bis[3-(dibenzothiophen-4-yl)phenyl]benzofuro[2,3-b]pyrazine (abbreviation: 3,8mDBtP2Bfpr), 4,8-Bis[3-(dibenzothiophen-4-yl)phenyl]-[1]benzofuro[3,2-d]pyrimidine (abbreviation: 4,8mDBtP2Bfpm), 9-[(3'-Dibenzothiophen-4-yl)biphenyl-3-yl]naphtho[1',2':4,5]furo[2,3-b]pyrazine (abbreviation: 9mDBtBPNfpr), 8-[3'-(Dibenzothiophen-4-yl)(1,1'-biphenyl-3-yl)]naphtho[1',2':4,5]furo[3,2-d]pyrimidine (abbreviation: 8mDBtBPNfpm), 8-[(2,2'-Binaphthalen)-6-yl]-4-[3-(dibenzothiophen-4-yl)phenyl-[1]benzofuro[3,2-d]pyrimidine (abbreviation: 8(βN2)-4mDBtPBfpm), Tris(8-quinolinolato)aluminium(III) (abbreviation: Alq3), Tris(4-methyl-8-quinolinolato)aluminium (abbreviation: Almq3), Bis(10-hydroxybenzo[h]quinolinato)beryllium (abbreviation: BeBq2), Bis(2-methyl-8-quinolinolato)(4-phenylphenolato)aluminium(III) (abbreviation: BAlq) and Bis(8-quinolinolato)zinc(II) (abbreviation: Znq), and metal complexes with an oxazole skeleton or a thiazole skeleton, such as... B. Bis[2-(2-benzoxazolyl)phenolato]zinc(II) (abbreviation: ZnPBO) and Bis[2-(2-benzothiazolyl)phenolato]zinc(II) (abbreviation: ZnBTZ)., It is possible to use, in addition to the metal complexes, oxadiazole derivatives such as PBD, OXD-7 and CO11, triazole derivatives such as TAZ and p-EtTAZ, imidazole derivatives (including benzimidazole derivatives) such as TPBI and mDBTBIm-II, an oxazole derivative such as BzOs, phenanthroline derivatives such as BPhen, BCP and NBphen, quinoxaline derivatives and dibenzoquinoxaline derivatives such as 2mDBTPDBq-II, 2mDBTBPDBq-II, 2mCzBPDBq, 2CzPDBq-III, 7mDBTPDBq-II and 6mDBTPDBq-II, pyridine derivatives such as... B. 35DCzPPy and TmPyPB, pyrimidine derivatives such as 4,6mPnP2Pm, 4,6mDBTP2Pm-II and 4,6mCzP2Pm, and triazine derivatives such as PCCzPTzn and mPCCzPTzn-02. It is also possible to use high molecular weight compounds, such as PPy, PF-Py and PF-BPy. <elektroneninjektionsschicht> The electron injection layer 115 is a layer for increasing the efficiency of electron injection from the second electrode (cathode) 102 and is preferably formed using a material whose LUMO level is a small difference (of 0.5 eV or less) from the work function of a material used for the second electrode (cathode) 102. Therefore, the electron injection layer 115 can be formed using an alkali metal, an alkaline earth metal, or a compound thereof, such as... B. Lithium, cesium, lithium fluoride (LiF), cesium fluoride (CsF), calcium fluoride (CaF2), 8-(quinolinolato)lithium (abbreviation: Liq), 2-(2-pyridyl)phenolatolithium (abbreviation: LiPP), 2-(2-pyridyl)-3-pyridinolatolithium (abbreviation: LiPPy), 4-phenyl-2-(2-pyridyl)phenolatolithium (abbreviation: LiPPP), lithium oxide (LiOx), or cesium carbonate. A rare-earth metal compound such as erbium fluoride (ErF3) can also be used. If a charge-generating layer 104 is provided between two EL layers (103a and 103b) as in the light-emitting device in Fig. 6B, a structure can be obtained in which a plurality of EL layers are arranged one above the other between the pair of electrodes (the structure is also called a tandem structure). It should be noted that in this embodiment, the functions and materials of the hole injection layer 111, the hole transport layer 112, the light-emitting layer 113, the electron transport layer 114 and the electron injection layer 115 shown in Fig. 6A are the same as those of hole injection layers 111a and 111b, hole transport layers 112a and 112b, light-emitting layers 113a and 113b, electron transport layers 114a and 114b and electron injection layers 115a and 115b shown in Fig. 6B. <ladungserzeugungsschicht> In the light-emitting device shown in Fig. 6B, the charge-generating layer 104 has a function for injecting electrons into the EL layer 103a and for injecting holes into the EL layer 103b when a voltage is applied between the first electrode (anode) 101 and the second electrode (cathode) 102. The charge-generating layer 104 can have either a structure in which an electron acceptor is added to a hole transport material or a structure in which an electron donor is added to an electron transport material. Alternatively, both of these layers can be arranged one above the other. It should be noted that forming the charge-generating layer 104 using any of the aforementioned materials can suppress an increase in the operating voltage caused by the layer arrangement of the EL layers. In the case where the charge-generating layer 104 has a structure in which an electron acceptor is added to a hole-transporting material, any of the materials described for this embodiment can be used as the hole-transporting material. Examples of suitable electron acceptors include 7,7,8,8-tetracyano-2,3,5,6-tetrafluoroquinodimethane (abbreviation: F4-TCNQ), chloranil, and the like. Further examples include oxides of metals belonging to groups 4 to 8 of the periodic table. Specific examples are vanadium oxide, niobium oxide, tantalum oxide, chromium oxide, molybdenum oxide, tungsten oxide, manganese oxide, and rhenium oxide. In the case where the charge-generating layer 104 has a structure in which an electron donor is added to an electron transport material, any of the materials described in this embodiment can be used as the electron transport material. An alkali metal, an alkaline earth metal, a rare earth metal, metals belonging to groups 2 and 13 of the periodic table, or an oxide or carbonate thereof can be used as the electron donor. In particular, lithium (Li), cesium (Cs), magnesium (Mg), calcium (Ca), ytterbium (Yb), indium (In), lithium oxide, cesium carbonate, or the like are preferably used. An organic compound, such as tetrathianaphthacene, can be used as the electron donor. Although Fig. 6B shows the structure in which two EL layers 103 are arranged one above the other, three or more EL layers can be arranged one above the other, with charge-generating layers provided between each pair of adjacent EL layers. <substrat> The light-emitting device described in this embodiment can be formed on any number of different substrates. It should be noted that the type of substrate is not limited to any particular kind. Examples of substrates include semiconductor substrates (e.g., a single-crystal substrate and a silicon substrate), an SOI substrate, a glass substrate, a quartz substrate, a plastic substrate, a metal substrate, a stainless steel substrate, a substrate containing a stainless steel foil, a tungsten substrate, a substrate containing a tungsten foil, a flexible substrate, a mounting film, paper containing a fiber material, and a base material film. Examples of the glass substrate include barium borosilicate glass, aluminum borosilicate glass, and soda-lime glass. Examples of the flexible substrate, affixing film, and base material film include plastics, typically polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polyethersulfone (PES); a synthetic resin, such as an acrylic resin, polypropylene, polyester, polyvinyl fluoride, polyvinyl chloride, polyamide, polyimide, an aramid resin, an epoxy resin, an evaporation-deposited inorganic film, and paper. For the fabrication of the light-emitting device of this embodiment, a vacuum process, such as an evaporation process, or a solution process, such as a rotational coating process or an inkjet process, can be used. If an evaporation process is used, a physical vapor deposition (PVD) process, such as a sputtering process, an ion plating process, an ion beam evaporation process, a molecular beam evaporation process, or a vacuum evaporation process, a chemical vapor deposition (CVD) process, or the like can be employed.In particular, the functional layers contained in the EL layers (the hole injection layers 111, 111a and 111b, the hole transport layers 112, 112a and 112b, the light-emitting layers 113, 113a and 113b, the electron transport layers 114, 114a and 114b and the electron injection layers 115, 115a and 115b) as well as the charge generation layers 104, 104a and 104b of the light-emitting device can be coated by an evaporation process (e.g. a vacuum evaporation process), a coating process (e.g. a dip coating process, a nozzle coating process, a rod coating process, a rotary coating process or a spray coating process), a printing process (e.g. an inkjet process, screen printing (stencil printing), offset printing (planographic printing), flexographic printing (relief printing), intaglio printing, microcontact printing or nanoembossing lithography) or the like. It should be noted that materials that can be used for the functional layers contained in the EL layers 103, 103a and 103b (the hole injection layers 111, 111a and 111b, the hole transport layers 112, 112a and 112b, the light-emitting layers 113, 113a and 113b, the electron transport layers 114, 114a and 114b and the electron injection layers 115, 115a and 115b) as well as the charge generation layers 104, 104a and 104b of the light-emitting device described in this embodiment are not limited to the materials listed above, and other materials can be used in combination, as long as the functions of the layers are ensured. For example, a high molecular weight compound (e.g.An oligomer, a dendrimer, or a polymer), a medium-molecular-weight compound (a compound between a low-molecular-weight compound and a high-molecular-weight compound with a molecular weight of 400 to 4000), or an inorganic compound (e.g., a quantum dot material) can be used. The quantum dot material can be a gelatinous quantum dot material, an alloyed quantum dot material, a core-shell quantum dot material, a core-quantum quantum dot material, or the like. The structures described in this embodiment can be combined with any of the structures described in the other embodiments as required. (Version 4) In this embodiment of the present disclosure, a light-emitting device is described. It should be noted that a light-emitting device, shown in Fig. 7A, is a light-emitting active matrix device in which transistors (FETs) 202 are electrically connected to light-emitting devices (203R, 203G, 203B and 203W) via a first substrate 201. The light-emitting devices (203R, 203G, 203B and 203W) include a common EL layer 204 and each has a microcavity structure in which the optical path length between electrodes is adapted according to the emission color of the light-emitting device. The light-emitting device is a top-emission light-emitting device in which light is emitted from the EL layer 204 through color filters (206R, 206G and 206B) formed on a second substrate 205. The light-emitting device shown in Fig. 7A is constructed such that a first electrode 207 serves as a reflective electrode and a second electrode 208 serves as a transflective electrode that both transmits and reflects light (visible light or near-infrared light). It should be noted that, with regard to the electrode materials for the first electrode 207 and the second electrode 208, reference can be made, as needed, to the description of one of the other embodiments. In the case where, for example, in Fig. 7A, the light-emitting device 203R serves as a red light-emitting device, the light-emitting device 203G as a green light-emitting device, the light-emitting device 203B as a blue light-emitting device, and the light-emitting device 203W as a white light-emitting device, a distance between the first electrode 207 and the second electrode 208 in the light-emitting device 203R is adjusted to obtain an optical path length 200R, as shown in Fig. 7B; a distance between the first electrode 207 and the second electrode 208 in the light-emitting device 203G is adjusted to obtain an optical path length 200G; and a distance between the first electrode 207 and the second electrode 208 in the light-emitting device 203B is adjusted to obtain an optical path length 200B. receive.It should be noted that the optical adjustment can be carried out such that, as shown in Fig. 7B, a conductive layer 210R is arranged over the first electrode 207 in the light-emitting device 203R and a conductive layer 210G is arranged over the first electrode 207 in the light-emitting device 203G. The second substrate 205 is provided with the color filters (206R, 206G, and 206B). It should be noted that each color filter transmits visible light in a specific wavelength range and blocks visible light in a specific wavelength range. Therefore, as shown in Fig. 7A, the color filter 206R, which transmits only light in the red wavelength range, is positioned so that it overlaps the light-emitting device 203R, thus enabling red light emission from the light-emitting device 203R. Furthermore, the color filter 206G, which transmits only light in the green wavelength range, is positioned so that it overlaps the light-emitting device 203G, thus enabling green light emission from the light-emitting device 203G.Furthermore, the color filter 206B, which transmits only light in the blue wavelength range, is provided at a point where it overlaps the light-emitting device 203B, thereby enabling blue light emission from the light-emitting device 203B. It should be noted that the light-emitting device 203W can emit white light without a color filter. It should also be noted that a black layer (black matrix) 209 can be provided at one end section of each color filter. The color filters (206R, 206G, and 206B) and the black layer 209 can be covered with a cover layer formed using a transparent material. Although the light-emitting device in Fig. 7A has a structure in which light is extracted from the side of the second substrate 205 (top-emission structure), a structure can also be used, as shown in Fig. 7C, in which light is extracted from the side of the first substrate 201, above which the FETs 202 are formed (bottom-emission structure). In the case of a bottom-emission light-emitting device, the first electrode 207 is configured as a transflective electrode and the second electrode 208 is configured as a reflective electrode. The first substrate 201 is a substrate that has at least one light transmittance. As shown in Fig. 7C, color filters (206R', 206G', and 206B') are positioned closer to the first substrate 201 than the light-emitting devices (203R, 203G, and 203B). In Fig. 7A, the light-emitting devices are the red light-emitting device, the green light-emitting device, the blue light-emitting device, and the white light-emitting device; however, the light-emitting devices of one embodiment of the present invention are not limited to the above, and a yellow light-emitting device or an orange light-emitting device may be used. It should be noted that, with regard to the materials used for the EL layers (a light-emitting layer, a hole injection layer, a hole transport layer, an electron transport layer, an electron injection layer, a charge generation layer, and the like), reference may be made, as needed, to the description of one of the other embodiments in order to fabricate each of the light-emitting devices.In this case, a color filter must be selected appropriately according to the emission color of the light-emitting device. The above structure can be used to manufacture a light-emitting device that includes light-emitting devices exhibiting a variety of emission colors. The structures described in this embodiment can be used in appropriate combination with any of the structures described in the other embodiments. (Version 5) In this embodiment of the present disclosure, a light-emitting device is described. The use of the device structure of the light-emitting device of one embodiment of the present invention enables the fabrication of a light-emitting active matrix device or a light-emitting passive matrix device. It should be noted that a light-emitting active matrix device has a structure comprising a combination of a light-emitting device and a transistor (FET). Therefore, a light-emitting passive matrix device and a light-emitting active matrix device are each embodiments of the present invention. It should be noted that any of the light-emitting devices described in the other embodiments can be used for the light-emitting device described in this embodiment. In this embodiment, a light-emitting active matrix device is described with reference to Fig. 8A and Fig. 8B. Fig. 8A is a top view showing the light-emitting device, and Fig. 8B is a cross-sectional view taken along the catenary AA' in Fig. 8A. The light-emitting active matrix device comprises a pixel section 302, a source line driver section 303, and gate line driver sections (304a and 304b) provided above a first substrate 301. The pixel section 302 and the driver sections (303, 304a, and 304b) are sealed with a sealant 305 between the first substrate 301 and a second substrate 306. A connecting line 307 is provided above the first substrate 301. The connecting line 307 is electrically connected to an FPC 308, which is an external input terminal. It should be noted that the FPC 308 transmits a signal (e.g., a video signal, a clock signal, a start signal, or a reset signal) or a potential from outside to the driver circuit sections (303, 304a, and 304b). The FPC 308 may be mounted on a printed circuit board (PWB). It should be noted that the light-emitting device mounted on an FPC or a PWB is included in the category of a light-emitting device. Fig. 8B shows a cross-sectional structure of the light-emitting device. Pixel section 302 contains a plurality of pixels, each containing a switching FET 311, a current-controlling FET 312, and a first electrode 313 electrically connected to FET 312. It should be noted that the number of FETs contained in each pixel is not particularly limited and can be adjusted as appropriate. For example, FETs 309, 310, 311, and 312 can be used as staggered transistors or inverted staggered transistors without any particular restrictions. A top-gate transistor, a bottom-gate transistor, or the like can be used. It should be noted that there is no particular restriction regarding the crystallinity of a semiconductor that can be used for FETs 309, 310, 311, and 312; an amorphous semiconductor or a semiconductor with crystallinity (a microcrystalline semiconductor, a polycrystalline semiconductor, a single-crystal semiconductor, or a semiconductor that partially contains crystalline regions) can be used. Preferably, a semiconductor with crystallinity is used, in which case a deterioration of the transistor properties can be prevented. The semiconductor can be, for example, an element from group 14, a compound semiconductor, an oxide semiconductor, an organic semiconductor, or the like. Typical examples include a semiconductor containing silicon, a semiconductor containing gallium arsenide, or an oxide semiconductor containing indium. The driver circuit section 303 includes the FET 309 and the FET 310. The driver circuit section 303 can be implemented with a circuit containing transistors of the same conduction type (either n-channel or p-channel transistors), or with a CMOS circuit containing one n-channel transistor and one p-channel transistor. Alternatively, a driver circuit can be provided externally. An end section of the first electrode 313 is covered with an insulator 314. The insulator 314 can be formed using an organic compound, such as a negative photosensitive resin or a positive photosensitive resin (acrylic resin), or an inorganic compound, such as silicon dioxide, silicon oxynitride, or silicon nitride. The insulator 314 preferably has a curved surface with a curvature at its upper end section or lower end section. In this case, an advantageous covering can be obtained with a film formed over the insulator 314. An EL layer 315 and a second electrode 316 are arranged above the first electrode 313. The EL layer 315 comprises a light-emitting layer, a hole injection layer, a hole transport layer, an electron transport layer, an electron injection layer, a charge generation layer, and the like. The structure and materials described in one of the other embodiments can be used for the components of a light-emitting device 317 described in this embodiment. Although not shown, the second electrode 316 is electrically connected to the FPC 308, which is an external input terminal. Although the cross-sectional view in Fig. 8B shows only a single light-emitting device 317, a plurality of light-emitting devices are arranged in a matrix in the pixel section 302. Light-emitting devices emitting light of three types of colors (R, G, and B) are selectively formed in the pixel section 302, thereby obtaining a light-emitting device capable of displaying a full-color image. In addition to the light-emitting devices emitting light of three types of colors (R, G, and B), light-emitting devices emitting, for example, white (W), yellow (Y), magenta (M), cyan (C), and the like can be formed.For example, light-emitting devices that emit light of some of the aforementioned colors are used in combination with light-emitting devices that emit light of three types of colors (R, G, and B), thereby achieving effects such as improved color purity and reduced power consumption. Alternatively, a light-emitting device capable of displaying a full-color image can be created by combining it with color filters. Red (R), green (G), blue (B), cyan (C), magenta (M), and yellow (Y) color filters, and the like, can be used as color filters. When the second substrate 306 and the first substrate 301 are joined together with the sealant 305, the FETs (309, 310, 311, and 312) and the light-emitting device 317 are positioned above the first substrate 301 in a space 318 enclosed by the first substrate 301, the second substrate 306, and the sealant 305. It should be noted that the space 318 may be filled with an inert gas (e.g., nitrogen or argon) or an organic substance (including the sealant 305). An epoxy resin, a glass frit, or the like can be used for the sealant 305. Preferably, a material with minimal moisture and oxygen permeability is used for the sealant 305. A substrate that can be used as the first substrate 301 can be used as the second substrate 306 in a similar manner. Therefore, any of the various substrates described in the other embodiments can be used appropriately. A glass substrate, a quartz substrate, or a plastic substrate made of fiber-reinforced plastic (FRP), polyvinyl fluoride (PVF), polyester, an acrylic resin, or the like can be used as the substrate. In the case where a glass frit is used for the sealant, the first substrate 301 and the second substrate 306 are preferably glass substrates with regard to adhesion. In this way, the light-emitting active matrix device can be obtained. In cases where the light-emitting active matrix device is deployed over a flexible substrate, the FETs and the light-emitting device can be formed directly over the flexible substrate; alternatively, the FETs and the light-emitting device can be formed over a substrate provided with a separating layer and then separated by applying heat, force, laser light, or the like to the separating layer to transfer them to a flexible substrate. The separating layer can be, for example, a layer arrangement comprising inorganic films, such as a tungsten film and a silicon oxide film, or an organic resin film made of polyimide or the like.Examples of flexible substrates include, in addition to a substrate on which a transistor can be formed, a paper substrate, a cellophane substrate, an aramid film substrate, a polyimide film substrate, a fabric substrate (including a natural fiber (silk, cotton, or hemp), a synthetic fiber (nylon, polyurethane, or polyester), a regenerated fiber (acetate, cupro, viscose, or regenerated polyester), or the like), a leather substrate, and a rubber substrate. Using any of these substrates, an increase in durability, an increase in heat resistance, a reduction in weight, and a reduction in thickness can be achieved. The light-emitting device contained in the active matrix light-emitting unit can emit pulsed light (e.g., at a frequency of kHz or MHz) so that the light can be used for display purposes. The light-emitting device, designed using one of the aforementioned organic compounds, exhibits excellent frequency characteristics; therefore, the operating time of the light-emitting device can be reduced, leading to a decrease in power consumption. Furthermore, a reduction in operating time prevents heat generation, thus reducing the rate of deterioration of the light-emitting device. The structures described in this embodiment can be used in appropriate combination with any of the structures described in the other embodiments. (Version 6) In this embodiment, examples of various electronic devices and a vehicle are described, which are manufactured using the light-emitting device of an embodiment of the present invention or a light-emitting device that includes the light-emitting device of an embodiment of the present invention. It should be noted that the light-emitting device can be used primarily in a display section of the electronic device described in this embodiment. Electronic devices shown in Figs. 9A to 9E may include a housing 7000, a display section 7001, a loudspeaker 7003, an LED lamp 7004, operating buttons 7005 (including a power switch or an operating switch), a connection terminal 7006, a sensor 7007 (a sensor with a function for measuring force, displacement, position, velocity, acceleration, angular velocity, rotational speed, distance, light, liquid, magnetism, temperature, a chemical substance, sound, time, hardness, an electric field, current, voltage, electrical power, radiation, flow rate, humidity, gradient, vibration, odor or infrared beam), a microphone 7008 and the like. Fig. 9A shows a portable computer which, in addition to the above components, may include a switch 7009, an infrared connector 7010 and the like. Fig. 9B shows a portable image display device (e.g. a DVD player) which is equipped with a storage medium and may include, in addition to the components mentioned above, a second display section 7002, a storage medium read section 7011 and the like. Fig. 9C shows a digital camera which has a television reception function and may include, in addition to the above components, an antenna 7014, a shutter release button 7015, an image reception section 7016 and the like. Figure 9D depicts a portable information terminal. The portable information terminal has a function for displaying information on three or more surfaces of the display section 7001. Here, information 7052, information 7053, and information 7054 are displayed on different surfaces. For example, a user of the portable information terminal can check the information 7053, which is displayed in such a way that it can be viewed from above the portable information terminal, with the portable information terminal kept in a breast pocket of his clothing. Thus, for example, the user can see the display without removing the portable information terminal from his pocket and can decide whether to answer the call. Fig. 9E depicts a portable information terminal (e.g., a smartphone) and may include the display section 7001, the control button 7005, and the like within the housing 7000. It should be noted that the portable information terminal may include a speaker, a connection port, a sensor, or the like. The portable information terminal can display text and image data on its various surfaces. Here, three icons 7050 are shown. Furthermore, information 7051, represented by dashed rectangles, may be displayed on another surface of the display section 7001. Examples of the information 7051 include a notification of the arrival of an email, SNS message, call, or the like; the subject and sender of an email, SNS message, or the like; the date; the time; the remaining battery power; and the signal strength of an antenna.The icon 7050 or similar can be displayed in the place where the information 7051 is displayed. Fig. 9F depicts a large television set (also called a TV or television receiver) and may include the housing 7000, the display section 7001, and the like. The housing 7000 is shown supported by a stand 7018. The television set can be operated with a separate remote control 7111 or the like. The display section 7001 may include a touch sensor. The television set can be operated by touching the display section 7001 with a finger or the like. The remote control 7111 may be equipped with a display section for showing information output by the remote control 7111. The television channels and volume can be controlled, and images displayed on the display section 7001 can be controlled, by means of control buttons or a touchscreen on the remote control 7111. The electronic devices shown in Figs. 9A to 9F can have various functions, such as a function for displaying various information (a still image, a moving image, a text image, and the like) on the display section, a touchscreen function, a function for displaying a calendar, the date, the time, and the like, a function for controlling processing by means of various types of software (programs), a wireless communication function, a function for connecting to various computer networks by means of a wireless communication function, a function for transmitting and receiving various data by means of a wireless communication function, and a function for reading a program or data that is / are stored in a storage medium and for displaying the program or data on the display section.Furthermore, the electronic device, which includes a multitude of display sections, may have the following functions: a function for displaying image data mainly on one display section while text data is mainly displayed on another display section; a function for displaying a three-dimensional image by displaying images on a multitude of display sections, taking into account parallax or the like.Furthermore, the electronic device, which includes an image reception section, may have the following functions: a function for capturing a still image, a function for capturing a moving image, a function for automatically or manually correcting a captured image, a function for storing a captured image in a storage medium (an external storage medium or a storage medium built into the camera), a function for displaying a captured image on the display section, or the like. It should be noted that the functions that can be provided for the electronic devices shown in Figures 9A to 9F are not limited to those described above, and the electronic devices may have various functions. Fig. 9G depicts a wristwatch-like portable information terminal, which can be used, for example, as a wristwatch-like electronic device. The wristwatch-like portable information terminal includes the housing 7000, the display section 7001, control buttons 7022 and 7023, a connection port 7024, a band 7025, a microphone 7026, a sensor 7029, a loudspeaker 7030, and the like. The display surface of the display section 7001 is curved, and images can be displayed on the curved display surface. Furthermore, two-way communication can be established between the portable information terminal and, for example, a headset suitable for wireless communication, thus enabling hands-free operation using the portable information terminal. It should be noted that the connection port 7024 enables two-way data transmission with another information terminal as well as charging.Wireless power supply can also be used during the charging process. The display section 7001, which is mounted in the housing 7000 serving as a bezel, comprises a non-rectangular display area. The display section 7001 can display an icon showing the time, another icon, and the like. The display section 7001 can be a touchscreen (an input / output device) that includes a touch sensor (an input device). The wristwatch-like electronic device shown in Fig. 9G can have various functions, such as a function for displaying various information (a still image, a moving image, a text image, and the like) on the display section, a touchscreen function, a function for displaying a calendar, the date, the time, and the like, a function for controlling processing by means of various types of software (programs), a wireless communication function, a function for connecting to various computer networks by means of a wireless communication function, a function for transmitting and receiving various data by means of a wireless communication function, and a function for reading a program or data that is / are stored in a storage medium and for displaying the program or data on the display section. The housing 7000 can contain a speaker, a sensor (a sensor with a function to measure force, displacement, position, speed, acceleration, angular velocity, rotational speed, distance, light, liquid, magnetism, temperature, a chemical substance, sound, time, hardness, an electric field, current, voltage, electrical power, radiation, flow rate, humidity, gradient, vibration, odor or infrared rays), a microphone and the like. It should be noted that the light-emitting device of an embodiment of the present disclosure can be used in the display section of any of the electronic devices described in this embodiment, so that a long-life electronic device can be obtained. Another electronic device incorporating the light-emitting device is a foldable, portable information terminal, illustrated in Figures 10A to 10C. Figure 10A shows a portable information terminal 9310 unfolded. Figure 10B shows the portable information terminal 9310 unfolding or folding. Figure 10C shows the portable information terminal 9310 folded. The portable information terminal 9310 is highly portable when folded. When unfolded, the portable information terminal 9310 is easily searchable due to its large, seamless display area. A display section 9311 is supported by three housings 9315 connected to each other by hinges 9313. It should be noted that the display section 9311 can be a touchscreen (an input / output device) incorporating a touch sensor (an input device). The shape of the portable information terminal 9310 can be reversibly changed from an open state to a folded state by bending the display section 9311 at a junction between two housings 9315 using the hinges 9313. The light-emitting device of an embodiment of the present disclosure can be used for the display section 9311. Furthermore, a long-life electronic device can be obtained. A display area 9312 in the display section 9311 is a display area positioned on a side face of the folded portable information terminal 9310.The display area 9312 can show information icons, shortcuts to frequently used applications or programs, and the like, and allows for easy confirmation of information as well as starting applications and the like. Figures 11A and 11B depict a vehicle incorporating the light-emitting device. The light-emitting device may be installed in the vehicle and, in particular, may be contained in headlights 5101 (including rear headlights), a hubcap 5102, part of a door 5103 or the entire door 5103, or the like, on the outside of the vehicle shown in Figure 11A. The light-emitting device may also be contained in a display section 5104, a steering wheel 5105, a gearshift lever 5106, a seat 5107, an interior rearview mirror 5108, a windshield 5109, or the like, on the inside of the vehicle shown in Figure 11B, or in part of a glass window. In the manner described above, electronic devices and vehicles can be obtained using the light-emitting device of an embodiment of this disclosure. In this case, a long-life electronic device can be obtained. It should be noted that the light-emitting device for electronic devices and vehicles can be used in various fields, not limited to those described in this embodiment. The structures described in this embodiment can be used in appropriate combination with any of the structures described in the other embodiments. (Version 7) In this embodiment, the structure of a lighting device, which is manufactured using the light-emitting device of an embodiment of the present disclosure or the light-emitting device which is part of the light-emitting device, is described with reference to Fig. 12 and Fig. 13. Figures 12 and 13 are examples of cross-sectional views of lighting devices. Figure 12 shows a bottom-emission lighting device where light is extracted from the side of the substrate, and Figure 13 shows a top-emission lighting device where light is extracted from the side of the sealing substrate. A lighting device 4000, shown in Fig. 12, includes a light-emitting device 4002 above a substrate 4001. The lighting device 4000 also includes a substrate 4003 with an unevenness on the outside of the substrate 4001. The light-emitting device 4002 includes a first electrode 4004, an EL layer 4005, and a second electrode 4006. The first electrode 4004 is electrically connected to an electrode 4007, and the second electrode 4006 is electrically connected to an electrode 4008. An auxiliary conductor 4009, electrically connected to the first electrode 4004, can also be provided. It should be noted that an insulating layer 4010 is formed over the auxiliary conductor 4009. The substrate 4001 and a sealing substrate 4011 are joined to one another by a sealing agent 4012. A desiccant 4013 is preferably provided between the sealing substrate 4011 and the light-emitting device 4002. The substrate 4003 has the unevenness shown in Fig. 12, which increases the extraction efficiency of the light emitted by the light-emitting device 4002. A lighting device 4200, shown in Fig. 13, includes a light-emitting device 4202 over a substrate 4201. The light-emitting device 4202 includes a first electrode 4204, an EL layer 4205 and a second electrode 4206. The first electrode 4204 is electrically connected to an electrode 4207, and the second electrode 4206 is electrically connected to an electrode 4208. An auxiliary line 4209, electrically connected to the second electrode 4206, can be provided. An insulating layer 4210 can be provided under the auxiliary line 4209. The substrate 4201 and a sealing substrate 4211 with an uneven surface are joined to each other by a sealant 4212. A barrier film 4213 and a planarizing film 4214 can be provided between the sealing substrate 4211 and the light-emitting device 4202. The sealing substrate 4211 has the uneven surface shown in Fig. 13, which increases the extraction efficiency of the light emitted by the light-emitting device 4202. Examples of such lighting devices include ceiling lights for interior lighting. Examples of ceiling lights include directly mounted lights and recessed lights. Such lighting devices are manufactured using a combination of the light-emitting device and a housing or cover. Another example: Such lighting devices can be used for floor lighting, illuminating a floor and thus improving floor safety. Floor lighting can be effectively used, for example, in a bedroom, on stairs, or in a hallway. In this case, the size or shape of the floor lighting can be adapted to the area or structure of a room. The floor lighting can be a stationary lighting device, constructed using a combination of the light-emitting unit and a support. Such lighting devices can also be used for a leaf-shaped lighting fixture (leaf-shaped lighting). The leaf-shaped lighting, which is mounted on a wall, is space-saving and can therefore be used for a wide variety of purposes. Furthermore, the surface area of ​​the leaf-shaped lighting can be easily enlarged. The leaf-shaped lighting can also be used on a wall or housing with a curved surface. In addition to the above examples, if the light-emitting device of an embodiment of the present disclosure or the light-emitting device which is part of the light-emitting device is used as part of a piece of furniture in a room, a lighting device which serves as that piece of furniture can be obtained. As described above, various lighting devices incorporating the light-emitting device can be obtained. It should be noted that these lighting devices are also embodiments of the present invention. The structures described in this embodiment can be used in appropriate combination with any of the structures described in the other embodiments. [Example 1] <<Synthesebeispiel 1> > This example describes a method for synthesizing 9,10-di(biphenyl-2-yl)-N,N'-bis(3,5-di-tert-butylphenyl)-N,N'-bis(9-phenyl-9H-carbazol-3-yl)anthracene-2,6-diamine (abbreviation: 2,6PCAPA-03), which is the compound of an embodiment of the present invention represented by the structural formula (100) of embodiment 1. The structure of 2,6PCAPA-03 is shown below. <Schritt 1: Synthese von N-(3,5-Di-tert-butylphenyl)-9-phenyl-9H-carbazol-3-amin> Into a 200 mL three-necked flask, 3.7 g (10 mmol) of 3-iodo-9-phenylcarbazole, 2.2 g (11 mmol) of 3,5-di-tert-butylphenylaniline, and 2.1 g (22 mmol) of sodium tert-butoxide were added, and the air in the flask was replaced with nitrogen. 100 mL of toluene was added to this mixture, and the mixture was degassed by stirring under reduced pressure. 0.5 mL (0.16 mmol) of tri-tert-butylphosphine (a 10 wt% hexane solution) and 90 mg (0.16 mmol) of bis(dibenzylideneacetone)palladium(0) were added to this mixture, and then stirring was carried out for 3 hours under a nitrogen stream at 90°C. After stirring, 500 ml of toluene were added to the resulting mixture, and then suction filtration was carried out through Florisil (catalog no. 066-05265, manufactured by Wako Pure Chemical Industries, Ltd.), Celite (catalog no. 537-02305, manufactured by Wako Pure Chemical Industries, Ltd.), and aluminum oxide to obtain a filtrate. The filtrate was concentrated to obtain a brown solid. The resulting solid was purified by silica gel chromatography (hexane:toluene = 7:3 as mobile phase) to obtain 3.9 g of a white solid in 87% yield. A synthesis scheme of step 1 is shown below in (a-1). The results of a 1H-NMR measurement of the white solid obtained in step 1 are shown below. These results revealed that N-(3,5-di-tert-butylphenyl)-9-phenyl-9H-carbazol-3-amine was obtained. 1H NMR (CD2Cl, 300 MHz): σ= 8.05-8.02 (m, 1H), 7.92 (d, J = 2.1 Hz, 1H), 7.66-7.58 (m, 4H), 7.50-7.35 (m, 4H), 7.27-7.19 (m, 2H), 6.98-6.94 (m, 3H), 5.83 (bs, 1H), 1.31 (s, 18H). <Schritt 2: Synthese von 2,6PCAPA-03> Into a 200 ml three-necked flask, 1.0 g (1.6 mmol) of 9,10-di(biphenyl-2-yl)-2,6-dibromoanthracene, 1.4 g (3.2 mmol) of N-(3,5-di-tert-butylphenyl)-9-phenyl-9H-carbazol-3-amine, 0.60 g (6.2 mmol) of sodium tert-butoxide, and 60 mg (0.15 mmol) of 2-dicyclohexylphosphino-2',6'-dimethoxybiphenyl (abbreviation: SPhos) were added, and the air in the flask was replaced with nitrogen. 20 ml of xylene were added to this mixture, and the resulting mixture was degassed by stirring under reduced pressure. 40 mg (70 µmol) of bis(dibenzylideneacetone)palladium(0) were added to this mixture, and stirring was carried out for 6 hours under a nitrogen stream at 150 °C. After stirring, 500 ml of toluene were added to the resulting mixture, and then suction filtration was carried out through Florisil (catalog no. 066-05265, manufactured by Wako Pure Chemical Industries, Ltd.), Celite (catalog no. 537-02305, manufactured by Wako Pure Chemical Industries, Ltd.), and aluminum oxide to obtain a filtrate. The filtrate was concentrated to obtain a brown solid. This solid was purified by silica gel column chromatography (hexane:toluene = 3:2 as mobile phase) to obtain a yellow target solid. The resulting yellow solid was recrystallized from the toluene to obtain 0.96 g of a yellow target solid in a 45% yield. A synthesis scheme for step 2 is shown below in (a-2). 0.96 g of the obtained yellow solid were purified by a train sublimation process. During purification, the yellow solid was heated at 345 °C for 15 hours under a pressure of 3.2 Pa. After purification, 0.91 g of a yellow target solid was obtained with a recovery rate of 95%. The results of a 1H-NMR measurement of the yellow solid obtained in step 2 are shown below. Fig. 14 is a 1H-NMR diagram. The results reveal that 2,6PCAPA-O3 (structural formula (100)) was obtained. 1H NMR (CD2Cl, 300 MHz): σ = 7.99-7.94 (m, 2H), 7.83-7.74 (m, 2H), 7.67-7.59 (m, 8H), 7.52-7.37 (m, 6H), 7.32-7.14 (m, 14H), 7.12-6.74 (m, 22H), 1.19 (s, 36H). Next, the absorption and emission spectra of 2,6-PCAPA-O3 in a toluene solution were measured. A UV-VIS absorption spectrum (hereafter referred to simply as the absorption spectrum) and an emission spectrum were recorded. The absorption spectrum was measured using a UV-VIS spectrophotometer (V-550, manufactured by JASCO Corporation). The emission spectrum was measured using a fluorescence spectrophotometer (FP-8600DS, manufactured by JASCO Corporation). Figure 15 shows the obtained absorption and emission spectra of 2,6-PCAPA-O3 in the toluene solution. The horizontal axis represents the wavelength, and the vertical axis represents the absorption intensity. As shown in Fig. 15, 2,6PCAPA-03 in toluene solution has an absorption peak at about 493 nm and an emission wavelength peak at 534 nm (excitation wavelength: 480 nm). [Example 2] In this example, light-emitting devices were fabricated using a compound of an embodiment of the present invention, and their operating characteristics were measured. A light-emitting device 1-1, a light-emitting device 1-2, a light-emitting comparison device 1-a, and a light-emitting comparison device 1-b are described in this example. Each of these light-emitting devices has a device structure shown in Fig. 16. A light-emitting layer 913 in this example has a structure that has been described in Structure Example 7 of the light-emitting layer of embodiment 1, and in particular, it has a structure shown in Table 1.A light-emitting layer of each of the light-emitting device 1-1 and the light-emitting device 1-2 contains a compound of an embodiment of the present invention, 9,10-Di(biphenyl-2-yl)-N,N'-bis(3,5-di-tert-butylphenyl)-N,N'-bis(9-phenyl-9H-carbazol-3-yl)anthracene-2,6-diamine (abbreviation: 2,6PCAPA-03), in addition to 3,5-Bis(3-(9H-carbazol-9-yl)phenyl)pyridine (abbreviation: 35DCzPPy) and fac-Tris[(2,6-diisopropylphenyl)-2-phenyl-1H-imidazole]iridium(III) (abbreviation: [Ir(iPrpim)3]). The amount of 2,6PCAPA-03 in light-emitting device 1-1 differs from that in light-emitting device 1-2.In light-emitting comparison device 1-a, used as a comparison example, 9,10-diphenyl-N,N'-diphenyl-N,N'-bis(9-phenyl-9H-carbazol-3-yl)anthracene-2,6-diamine (abbreviation: 2,6PCAPA) is used instead of 2,6PCAPA-03, which is used in the light-emitting layers of light-emitting devices 1-1 and 1-2. Light-emitting comparison device 1-b contains only 35DCzPPy and [Ir(iPrpim)3] in a light-emitting layer. The chemical formulas of the materials used in this example are shown below. [Table 1] 901911912913914915903 Light Emitting Device 1-1ITSO(70nm)DBT3P-II:MoOx(1:0.5 40nm)PCCP(20nm)*35DCzPPy(10nm)TmPyPB(20nm)LiF(1nm)Al(200nm) Light-emitting device 1-2** Light-emitting comparison device 1-a*** Light-emitting comparison device 1-b***** * 35DCzPPy:[Ir(iPrpim) 3 ]:2.6PCAPA-03 (1:0.05:0.01 40 nm) ** 35DCzPPy:[Ir(iPrpim) 3 ]:2.6PCAPA-03 (1:0.05:0.05 40 nm) *** 35DCzPPy:[Ir(iPrpim) 3 ]:2.6PCAPA (1:0.05:0.05 40 nm) **** 35DCzPPy:[Ir(iPrpim) 3 ] (1:0.05 30 nm) <<Strukturen von Licht emittierenden Vorrichtungen> > In each of the light-emitting devices described in this example, as shown in Fig. 16, a hole injection layer 911, a hole transport layer 912, a light-emitting layer 913, an electron transport layer 914 and an electron injection layer 915 are arranged in this order over a first electrode 901 formed over a substrate 900, and a second electrode 903 is arranged over the electron injection layer 915. A glass substrate was used as substrate 900. A film of indium tin oxide containing silicon oxide (ITSO) was used as the first electrode 901, and its thickness was set to 70 nm. The electrode area of ​​the first electrode 901 was set to 4 mm² (2 mm × 2 mm). A film formed by co-evaporation of 1,3,5-tri(dibenzothiophen-4-yl)benzene (abbreviation: DBT3P-II) and molybdenum oxide (DBT3P-II: molybdenum oxide = 1:0.5 (mass ratio)) was used as the hole injection layer 911, and the thickness was adjusted to 40 nm. For the hole transport layer 912, 3,3'-Bis(9-phenyl-9H-carbazole) (abbreviation: PCCP) was used, and the thickness was set to 20 nm. For the light-emitting layer 913 of each of the light-emitting devices 1-1 and 1-2, a film containing 35DCzPPy, [Ir(iPrpim)3], and 2,6PCAPA-03 was used, and the thickness was set to 40 nm. For the light-emitting layer 913 of the light-emitting comparison device 1-a, a film containing 35DCzPPy, [Ir(iPrpim)3], and 2,6PCAPA-03 was used, and the thickness was set to 40 nm. For the light-emitting layer 913 of the light-emitting comparison device 1-b, a film containing 35DCzPPy and [Ir(iPrpim)3] was used, and the thickness was set to 30 nm. It should be noted that the weight ratios in the light-emitting layers 913 of the light-emitting devices, which differ from one another, are shown in Table 1. The electron transport layer 914 was a multilayer film made of 10 nm thick 35DCzPPy and 20 nm thick 1,3,5-Tri[(3-pyridyl)-phenyl-3-yl]benzene (abbreviation: TmPyPB). Lithium fluoride (LiF) was used for the electron injection layer 915, and the thickness was set to 1 nm. Aluminum was used for the second electrode 903, and its thickness was set to 200 nm. In this example, the second electrode 903 serves as the cathode. <<Betriebseigenschaften der Licht emittierenden Vorrichtungen> > The operating characteristics of the manufactured light-emitting devices were measured. Luminance, CIE chromaticity, and electroluminescence (EL) spectra were measured using a spectroradiometer (SR-UL1R, manufactured by TOPCON TECHNOHOUSE CORPORATION). It should be noted that the measurements were performed at room temperature (in an atmosphere maintained at 23 °C). As operating characteristics of the light-emitting devices 1-1 and 1-2 and the light-emitting comparison devices 1-a and 1-b, which are produced in this example, Fig. 17 shows the current density-luminance properties, Fig. 18 shows the voltage-luminance properties, Fig. 19 shows the luminance-current efficiency properties, Fig. 20 shows the voltage-current density properties and Fig. 21 shows the luminance-external quantum efficiency properties. Fig. 22 shows the electroluminescence spectra (EL spectra) at the time when a current with a current density of 2.5 mA / cm2 was supplied to each of the light-emitting devices. Next, Table 2 shows the initial values ​​of key properties of the light-emitting devices at approximately 1000 cd / m². [Table 2] [Table 2] Light-emitting device 1-13.20.0641.60.250.541200767524 Light-emitting device 1-23.30.0651.60.320.621100666317 Light-emitting comparator 1-a4.00.0912.30.340.621200534114 Light-emitting comparator 1-b 3.10.077 1.90.160.361100565726 Light-emitting devices 1-1 and 1-2 differ from light-emitting comparison device 1-b in that 2,6PCAPA-03, a compound of an embodiment of the present invention, is additionally included in the light-emitting layer. As shown in Fig. 22, the EL spectrum of light-emitting comparison device 1-b exhibited light blue light emission with a peak wavelength of 472 nm, originating from a phosphorescent substance, [Ir(iPrpim)3]. The EL spectrum of light-emitting device 1-1 exhibited both light emission with a peak wavelength of approximately 530 nm, originating from 2,6PCAPA-03, and light emission with a peak wavelength of approximately 472 nm, originating from [Ir(iPrpim)3]. The EL spectrum of the light-emitting device 1-2 exhibited green light emission, which has a peak wavelength of about 530 nm and originates from 2.6PCAPA-03.This indicates that in light-emitting devices 1-1 and 1-2, 2,6PCAPA-O3, a fluorescent substance, receives the excitation energy and emits light. The EL spectrum of light-emitting device 1-2 with a high concentration of the fluorescent substance showed light emission originating primarily from 2,6PCAPA-O3. This suggests that the fluorescent substance, at a higher concentration, is more likely to receive the excitation energy and emit light. The above results demonstrate that light-emitting device 1-2 exhibits a high external quantum efficiency of 20% or higher, despite the light emission originating from the fluorescent substance.The probability of generating singlet excitons by recombination of charge carriers (holes and electrons) injected by the pair of electrodes is at most 25%, and therefore the external quantum efficiency of a fluorescent element, in the case where the external light extraction efficiency is 30%, is at most 7.5%. However, the light-emitting device 1-2 exhibits an external quantum efficiency of more than 7.5%. This is because, in addition to light emission from singlet excitons generated by recombination of charge carriers (holes and electrons) injected by the pair of electrodes, light emission from triplet excitons can also be obtained from the fluorescent substance. Thus, it is established that the inclusion of 2,6PCAPA-03 in an embodiment of the present invention in the light-emitting layers of the light-emitting devices can prevent the deactivation of the triplet excitation energy, which is particularly problematic when the concentration is high, and the light emits efficiently. When light-emitting device 1-2 and light-emitting comparison device 1-a were compared, the external quantum efficiency of light-emitting comparison device 1-a, which contained 2,6PCAPA in the light-emitting layer with the same concentration of 2,6PCAPA-03 in light-emitting device 1-2, was lower than that of light-emitting device 1-2.This means that 2,6PCAPA-03 (which has a protecting group), used in the light-emitting device 1-2, compared to 2,6PCAPA (which does not have a protecting group), used in the light-emitting comparison device 1-a, can prevent the transfer of triplet excitation energy from the host through the Dexter mechanism and both singlet and triplet excitation energy can be efficiently converted into light emission, which greatly affects the external quantum efficiency. Operational tests were performed on light-emitting devices 1-1 and 1-2, as well as on the light-emitting comparator device 1-b, at a constant current density of 12.5 mA / cm². Figure 23 shows the results. The results show that increasing the concentration of 2,6-PCAPA-O3 improves reliability while maintaining high emission efficiency. This means that increasing the concentration of a guest in the light-emitting layer allows the excitation energy in the light-emitting layer to be efficiently converted into light emission from the guest, preventing non-radiative deactivation. In other words, it is suggested that increasing the concentration of the guest can prevent energy transfer from the host to the guest via the Dexter mechanism and increase the rate of energy transfer from the host to the guest via the Förster mechanism.Thus, the light-emitting device comprising the compound of an embodiment of the present invention exhibits high emission efficiency and high reliability. [Example 3] <<Synthesebeispiel 2> > This example describes a method for synthesizing 9,10-di(biphenyl-2-yl)-N,N'-bis[3,5-bis-(2-adamantyl)phenyl]-N,N'-bis(dibenzofuran-3-yl)anthracene-2,6-diamine (abbreviation: 2,6FrAPA), which is a compound of an embodiment of the present invention represented by the structural formula (112) of embodiment 1. The structure of 2,6FrAPA is shown below. The compound 2,6FrAPA described above can be synthesized similarly by the procedures shown in synthesis schemes (b-1) and (b-2), using 3,5-bis(2-adamantyl)phenyltrifluoromethanesulfonate and dibenzo[b,d]furan-3-amine instead of 3-iodo-9-phenylcarbazole and 3,5-di-tert-butylphenylaniline used in step 1 of Example 1. The compound emits green light. In this way, the compound of an embodiment of the present invention, represented by the structural formula (112), 2,6FrAPA, can be obtained.< / substrat> < / ladungserzeugungsschicht> < / elektroneninjektionsschicht> < / elektronentransportschicht> < / lochtransportschicht> < / lochinjektionsschicht>

Claims

Connection represented by a formula (G1): where A 1 and A 2 each independently represent a substituted or unsubstituted condensed aromatic ring with 10 to 30 carbon atoms, a substituted or unsubstituted condensed heteroaromatic ring with 3 to 30 carbon atoms, or a structure represented by a formula (Z-1) or a formula (Z-2), where Z 1 and Z 2 each independently exhibit a structure represented by the formula (Z-1) or (Z-2), where X 1 and X 2 each independently represent an alkyl group with 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group with 3 to 10 carbon atoms, a cycloalkyl group with a bridge structure and with 7 to 10 carbon atoms, or a trialkylsilyl group with 3 to 12 carbon atoms. where Ar 1 and Ar 2 each independently of each other -represent a substituted aromatic hydrocarbon group with 6 to 13 carbon atoms, wherein the substituent of the substituted aromatic hydrocarbon group of Ar 1 and Ar 2 each is represented by an alkyl group with 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group with 3 to 10 carbon atoms, a cycloalkyl group with a bridge structure and with 7 to 10 carbon atoms, or a trialkylsilyl group with 3 to 12 carbon atoms. where R 1 to R 16 each independently represents hydrogen, an alkyl group with 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group with 3 to 10 carbon atoms, a trialkylsilyl group with 3 to 12 carbon atoms, or a substituted or unsubstituted aryl group with 6 to 25 carbon atoms, where at least one of R 1 to R 5 an alkyl group with 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group with 3 to 10 carbon atoms, a trialkylsilyl group with 3 to 12 carbon atoms, or a substituted or unsubstituted aryl group with 6 to 25 carbon atoms, and where at least one of R 6 to R 10 represent an alkyl group with 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group with 3 to 10 carbon atoms, a trialkylsilyl group with 3 to 12 carbon atoms, or a substituted or unsubstituted aryl group with 6 to 25 carbon atoms. Compound according to claim 1, wherein A1 and A2 each independently comprise a substituted or unsubstituted stilbene group, a substituted or unsubstituted acridone group, a substituted or unsubstituted phenoxazine group, a substituted or unsubstituted phenothiazine group, a substituted or unsubstituted anthracene group, a substituted or unsubstituted fluorene group, a substituted or unsubstituted chrysene group, a substituted or unsubstituted triphenylene group, a substituted or unsubstituted tetracene group, a substituted or unsubstituted pyrene group, a substituted or unsubstituted perylene group, a substituted or unsubstituted quinoline group, a substituted or unsubstituted benzimidazole group, a substituted or an unsubstituted quinazoline group, a substituted or unsubstituted carbazole group,a substituted or unsubstituted acridine group, a substituted or unsubstituted coumarin group, a substituted or unsubstituted quinacridone group, a substituted or unsubstituted naphthobisbenzofuran group, a substituted or unsubstituted dibenzofuran group, a substituted or unsubstituted dibenzothiophene group, a substituted or unsubstituted indenocarbazole group, a substituted or unsubstituted indolocarbazole group, or a substituted or unsubstituted dibenzocarbazole group. Compound according to claim 1, wherein the compound is represented by a formula (G2): , where B 1 and B 2 Each independently represents a substituted or unsubstituted condensed heteroaromatic ring with 3 to 30 carbon atoms. Compound according to claim 3, wherein the substituted or unsubstituted condensed heteroaromatic ring of B1 and B2 each comprises a pyrrole ring. Compound according to claim 1, wherein the compound is represented by a formula (G3): where R 17 to R 42 each independently represent hydrogen, an alkyl group with 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group with 3 to 10 carbon atoms, a trialkylsilyl group with 3 to 12 carbon atoms, or a substituted or unsubstituted aryl group with 6 to 25 carbon atoms, one of R 17 to R 29 is bonded to a nitrogen atom that is attached to Z 1 is bound, and one of R 30 to R 42 is bonded to a nitrogen atom that is attached to Z 2 is bound. Compound according to claim 1, wherein the compound is represented by a formula (G4): where R 17 , R 19 to R 30 and R 32 to R 42 Each can independently represent hydrogen, an alkyl group with 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group with 3 to 10 carbon atoms, a trialkylsilyl group with 3 to 12 carbon atoms, or a substituted or unsubstituted aryl group with 6 to 25 carbon atoms. Compound according to claim 1, wherein the compound is represented by a formula (100) or (112): Light-emitting device comprising an EL layer between a pair of electrodes, wherein the EL layer comprises a light-emitting layer, and wherein the light-emitting layer comprises the compound according to any one of claims 1 to 7. Light-emitting device comprising an EL layer between a pair of electrodes, wherein the EL layer comprises a light-emitting layer, and wherein the light-emitting layer comprises a phosphorescent material and the compound according to any one of claims 1 to 7. Lighting device comprising: the light-emitting device according to claim 8; and at least one consisting of a housing, a cover and a support base.

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