577results about How to "High triplet energy level" patented technology

The invention discloses a 1,3,5-triazine derivative. The derivative is a compound with a structure of a formula I. The compound of the formula I can emit high-efficiency blue fluorescence and meanwhile has higher triplet state energy; so that the compound of the formula 1 can sensitize green and red phosphorescent doped materials while emitting the high-efficiency blue fluorescence, so that the technological conditions for preparing WOLEDs (White Organic Light Emitting Diode) are met. Meanwhile, the invention also discloses a preparation method of the compound of the formula 1 and application in preparation of the white light organic electroluminescent diode.

The invention discloses a condensed-ring compound and a preparation method and an application thereof. The condensed-ring compound has a structure represented by formula (I) or formula (II). The HOMOand LUMO energy levels of the fused-ring compound are completely separated, so that the energy gap width of the material is reduced, the three-wire energy level is improved, and the energy backflow from the object material to the main material is avoided to reduce the luminous efficiency; HOMO and LUMO energy levels are matched with adjacent materials, and the driving voltage is small. The devicehas large molecular structure size and good intramolecular conjugation, so it has good thermal stability, can avoid thermal decomposition of materials during film formation or use, avoids loss of material layer function, and improves luminous efficiency and luminous performance of the device. The invention also provides a preparation method of the fused-ring compound and its application as an organic electroluminescent material.

The invention provides a triarylamine compound and an organic electroluminescent device thereof, and relates to the technical field of organic photoelectric materials. According to the invention, a substituted or unsubstituted 9-phenyl-fluorene group and a triarylamine group containing benzoxazole/benzothiazole/benzimidazole/benzotriazole undergoes a reaction to obtain the triarylamine compound by9-position (tertiary C) connection of fluorene. The triarylamine compound has a good hole transport capability, is high in glass transition temperature, good in thermal stability, good in film-forming property, high in refractive index and simple to synthesize, can be applied to an organic electroluminescent device to serve as a hole transport layer and/or a covering layer, can effectively solvethe problems of low luminous efficiency and short service life of the organic electroluminescent device, and has the advantages of high luminous efficiency and long service life.

The present invention relates to the technical field of OLED, and provides a light emitting main body material including an adamantane structure and having a structure represented by the formula (I).L1 and L2 are each independently selected from the group consisting mainly of a single bond, phenyl, naphthyl, and the like; electron donor D is mainly selected from that group consisting of carbazolegroup and derivatives thereof, diphenylamino groups and derivatives thereof, acridine group and derivatives thereof; electron acceptor A is mainly selected from nitrogen-containing heterocyclic substituents, cyano-containing substituent, and triarylboron substituents. D-(Pi)-sigma-(Pi)-A structure in the compound of the invention has bipolarity, and the intermediate sigma bond can effectively interrupt the charge transfer between electron donor D and electron acceptor A, so that the excited state is limited to the local excited state in the fragment of electron donor D or electron acceptor A,thus the compound has a small excited state dipole moment. When it is used as the main material of the light emitting layer of the OLED device, the efficiency roll-off of the blue light material canbe effectively reduced, and the luminous brightness and the luminous efficiency can be improved.

The invention relates to a phenanthroimidazole symmetric derivative host material. The structure of the host material is represented by formula I, and can be used to form an organic electroluminescent device with the advantages of high luminescence efficiency, low driving voltage, long life, high brightness and high color purity. In the formula I, R1 and R2 are respectively independently selected from the hydrogen atom, substituted or unsubstituted C1-C30 alkyl groups, C1-C30 cycloalkyl groups, C1-C30 saturated alkyl groups, substituted or unsubstituted C1-C30 alkyloxy groups, substituted or unsubstituted C6-C30 aryl groups, substituted or unsubstituted C6-C30 aryloxy groups, substituted or unsubstituted C6-C30 arylamino groups, substituted or unsubstituted C2-C30 heterocyclic groups, substituted or unsubstituted C6-C30 fused polycyclic groups, hydroxy groups, cyan groups or substituted or unsubstituted amino groups.

The invention discloses bi(trimethylphenyl) boron derivatives. The derivatives are compounds with a structure show in a formula I; the formula I is as shown in the specification; the compounds shown in the formula I can emit efficient blue fluorescence, and also have high triplet level; green and red phosphor doped materials also can be sensitized when the efficient blue fluorescence is emitted; therefore, the technological conditions of preparation of white organic light-emitting diodes (WOLEDs) are met. Meanwhile, the invention also discloses a preparation method of the compounds shown in the formula I and application thereof in preparation of the white organic light-emitting diodes.

The invention belongs to the technical field of organic electroluminescent display, and particularly relates to coumarin derivates, a preparation method thereof and application thereof in a white-light organic electroluminescent device. The coumarin derivates are in any one structure as disclosed in the specification. The coumarin derivate materials provided by the invention can efficiently emit blue fluorescence, and have high color purity, high fluorescence quantum yield, high electroluminescence efficiency and favorable film-forming performance; and the synthesis and purification method ofthe coumarin derivate materials is simple and suitable for mass production. The coumarin derivate materials provided by the invention have a high triplet-state energy level (higher than 2.4eV), and can simultaneously sensitize green and red phosphorescent doped materials. The coumarin derivate materials provided by the invention can be used as main materials in illuminant materials and/or luminescent layers in the organic electroluminescent device and used for preparing the organic electroluminescent device.

The invention relates to a fluorescent blue light guest material and its preparation method and use and especially relates to a triphenyl phosphorus oxide-based thermal excitation delayed fluorescent blue light guest material and its preparation method and use. The triphenyl phosphorus oxide-based thermal excitation delayed fluorescent blue light guest material solves the problem that because of large difference of an electron donor and an acceptor, when the electron donor is increased, guest emission wavelength produces red shift so that stable and efficient blue guest luminescence cannot be realized. The blue light guest material has a structural formula shown in the description. The preparation method comprises 1, preparing PXZPhBr, PXZPhBr, PTZPhBr and DMACPhBr, 2, mixing the products obtained through the step 1 and tetrahydrofuran, adding n-butyllithium and diphenylphosphinous chloride into the mixture, adding hydrogen peroxide into the mixture, carrying out stirring and carrying out chromatography and recrystallization. The triphenyl phosphorus oxide-based thermal excitation delayed fluorescent blue light guest material is used for preparation of a thermal excitation delayed fluorescent electroluminescent device. The material utilizes short-axis modification strategy, effectively keeps a matrix triplet state energy level, has a donor-acceptor (D-A)-type molecular structure and balances carrier injection and transmission. The preparation method belongs to the field of fluorescent material preparation.

The invention provides a 6-mesitylene-6H-6-boron hetero benzo[cd]pyrene derivative containing substituted or non-substituted carbazolyl. Due to the bipolar transmission characteristic, the derivative can effectively balance transmission of carriers and improve transmission efficiency, by using the derivative in phosphorescent organic light-emitting devices as a main material. The invention also provides an organic electroluminescent device that has increased current efficiency, reduced turn-on voltage and good stability, and solves the problems of low transmission efficiency or poor stability of phosphorescent organic light-emitting main materials in the prior art.

A 9,9'- connected host material based on a 4,4'-difluorene structure and an application thereof. The invention discloses a host material which has high triplet state and HOMO energy level and has excellent performance. According to the host material, 4,4'- connected difluorene structure is used as a molecular skeleton, and a substituent group is connected at 9,9'- site. Diphenylamine element Dn with hole transport performance can be connected, and An element with electron-transport performance also can be connected, wherein the An element contains an oxygen-phosphorus element and a sulfur-oxygen element; and in addition to the oxygen-phosphorus element and the sulfur-oxygen element, a special spiral structure also can be formed. A synthetic method of the host material is simple and practicable, and the host material is suitable for wide application. An organic electroluminescence blue phosphorescent luminescent device made of the host material has high efficiency, high brightness, low extinction efficiency and electroluminescence performance of low starting voltage, and can widely be applied in the field of organic electroluminescence.

The invention discloses a multifunctional modified dibenzofuran-based phosphineoxy compound and a preparation method and an application thereof, which relate to a functional compound and a preparation method and an application thereof, and are used for solving the problem of slightly high starting voltage of a device since a high triplet state energy level and high current carrier injection/transmission capability cannot coexist. The multifunctional modified dibenzofuran-based phosphineoxy compound designed by the invention is a derivative of a compound of which the chemical name is 4,6-di(diphenyl phosphineoxy)dibenzofuran. The structural formula of the multifunctional modified dibenzofuran-based phosphineoxy compound is shown in the specifications. The preparation method comprises the following steps of: I, preparing a 4,6-di(diphenyl phosphineoxy)dibenzofuran bromation product; and II, preparing a multifunctional modified dibenzofuran-based phosphineoxy compound. The multifunctional modified dibenzofuran-based phosphineoxy compound is applied to preparation of an organic light-emitting device. The multifunctional modified dibenzofuran-based phosphineoxy compound is applied to efficient portable display terminals and illuminating equipment.

The invention relates to a bipolar body organic electroluminescent material. The formula of the bipolar body organic electroluminescent material is as shown in formula (1), wherein X is optional one of O, S and CMe2; R1 and R2 are identical or different, and R1 and R2 are independently selected from C1-C10 aliphatic linear chain or branch chain alkyl containing substituent group or unsubstituted group, C6-C30 aryl containing substituent group or unsubstituted group and C3-C30 heteroatom-containing aryl containing substituent group or unsubstituted group; R3-R10 are independently selected from hydrogen atom, C1-C10 aliphatic linear chain or branch chain alkyl and C6-C30 aryl containing substituent group or unsubstituted group, or the two adjacent groups of the R3-R10 are connected into a ring. The bipolar body organic electroluminescent material which can be used as the blue light and green light body material is good in thermodynamic stability, good in film forming performance, appropriate in triplet state energy level, and the like.

The invention discloses a multifunctional modified dibenzofuran-based di-phosphineoxy compound and a preparation method and an application thereof, which relate to a luminescent layer main body material in an electron phosphorescent device and a preparation method and an application thereof, and are used for solving the problem of high starting voltage during application of an electron phosphorescent device main body material prepared by using the conventional method since a high triple state energy level and high current carrier injection transport capability cannot be realized simultaneously. The preparation method of the multifunctional modified dibenzofuran-based di-phosphineoxy compound comprises the following steps of: I, performing a bromination reaction, and performing extraction, drying, spinning drying and column chromatography in sequence; and II, performing a substitution reaction, and performing extraction, drying, spinning drying and column chromatography in sequence. The multifunctional modified dibenzofuran-based di-phosphineoxy compound is applied as a luminescent layer main body material in an electron phosphorous device. The method is mainly used for preparing a multifunctional modified dibenzofuran-based di-phosphineoxy compound.

The present invention discloses a transition metal complex having carbene ligands. The disclosed transition metal complex has a structure of a center transition metal surrounded by two identical carbene ligands and one double-chilating ligand which is a nitrogen-contain heteroaryl group compound with pyridyl group. The disclosed transition metal complex can be represented by the following formula:

The invention relates to a photoelectric function material with a N-P=S resonant structure, a preparation method and application. The structure of the material is shown as a formula (I) in the specification, and in the formula (I), Ar represents carbazole or t-butyl carbazole, and Ph is phenyl. The photoelectric function material, which possesses the N-P=S resonant structure, dynamically-adjustable electricity performances, high triplet state energy level and bipolar transmission property, has the advantages of cheap raw materials, simple and convenient synthetic method, and good dissolvability, film-forming ability and stability. By introducing the N-P=S resonant structure, the material is obviously improved in carrier transmission capability and is endowed with excellent cavity transmission and electron transmission capability. Electroluminescent devices prepared from the material have high efficiency, relatively low turn-on voltage and stable electroluminescent performances. The technical scheme has important meaning on development of efficient stable organic light-emitting diodes.

An electroluminescent device comprising:—a first electrode for injection of positive charge carriers;—a second electrode for injection of negative charge carriers; and—an electroluminescent layer located between the first and second electrodes comprising a host material and a metal complex, wherein the host material comprises a polymer having a first repeat unit of formula (I): wherein each Ar is the same or different and independently represents an optionally substituted aryl or heteroaryl and any two Ar groups may be directly linked by a single bond.

The invention discloses a luminescent material with a spirofluorene benzyl unit. 9,9'-spirobifluorene molecules are taken as a main body to prepare a series of luminescent materials (see general formula I) by connection with different substituent groups. The compound provided by the invention has the characteristics of high glass transition temperature, high triplet state energy level, high quantum efficiency and the like, and can be applied to organic electroluminescent LEDs to serve as a luminescent material. Moreover, raw materials are easily available, the preparation is simple and convenient, the overall yield is high, and the cost of the luminescent material is greatly reduced.

The invention discloses a heterocompound organic material containing pyridine and metadiazine as well as a preparation method and an application of the heterocompound organic material. According to the preparation method of the material, the metadiazine is used as a core, and phenyl and pyridine are introduced on the periphery through selective palladium catalysis Suzuki coupling reaction, so the goal of regulating and controlling the material molecule rail energy stage is reached. The material has the electron transmission capability, simultaneously has the hole and exciton blocking capability and can be applied to organic electroluminescent diode electron transmission layers.