71results about How to "High luminous efficiency" patented technology

A tandem white OLED device includes an anode, a cathode, and a plurality of organic electroluminescence units disposed between the anode and the cathode, wherein each organic electroluminescence unit includes at least one light-emitting layer, and wherein each organic electroluminescence unit emits white light. The device also includes an intermediate connector disposed between each adjacent organic electroluminescence unit, wherein the intermediate connector includes at least two different layers, and wherein the intermediate connector has no direct connection to an external power source.

There are provided oligoarylene derivatives capable of emitting blue light at high luminous efficiency which are represented by the following general formulae (1) to (4):

Ar¹-Ch-Ar₂   (1)

Ch¹-L-Ch²   (2)

Ar₃-(L¹)_a-Ch³-(L²)_b-Ar₄   (3)

Ar⁵-Ch⁴-(Ar⁷)_n-L³-(Ar⁸)_m-Ch⁵-Ar⁶   (4)

wherein Ch, Ch¹ and Ch² are respectively a group containing at least one substituted or unsubstituted condensed aromatic ring having 14 to 20 nuclear atoms; Ch³, Ch⁴ and Ch⁵ are respectively a substituted or unsubstituted arylene group having 14 to 20 nuclear atoms; Ar¹, Ar², Ar³, Ar⁴, Ar⁵ and Ar⁶ are respectively a substituted or unsubstituted aryl group having 5 to 30 nuclear atoms; Ar⁷ and Ar⁸ are respectively a substituted or unsubstituted arylene group having 5 to 30 nuclear atoms; L¹, L² and L³ are respectively a connecting group; and a, b, n and m are respectively an integer of 0 to 1, as well as organic electroluminescent devices using the same.

The present invention relates to an organic electroluminescent device. There is provided an organic electroluminescent device with a good luminescence property and high luminous efficiency in which the organic electroluminescent device has a diffraction grating 2 on the surface of the substrate 1 and an organic EL layer 5 including an emission layer between an anode 4 an a cathode 6 via an intermediate layer 3.

Disclosed are an inorganic electroluminescent diode and a method of fabricating the same. Specifically, this invention provides an inorganic electroluminescent diode, which includes a semiconductor nanocrystal layer formed of inorganic material, an electron transport layer or a hole transport layer formed on the semiconductor nanocrystal layer using amorphous inorganic material, and a hole transport layer or an electron transport layer formed beneath the semiconductor nanocrystal layer using inorganic material, and also provides a method of fabricating such an inorganic electroluminescent diode. According to the method of fabricating the inorganic electroluminescent diode of this invention, an inorganic electroluminescent diode can be fabricated while maintaining the properties of luminescent semiconductor material of the semiconductor crystal layer, and also an inorganic electroluminescent diode which is stably operated and has high luminescent efficiency can be provided.

A light emitting apparatus 1 comprises: a semiconductor light emitting element 2; and a transparent ceramic phosphor 11 for converting a wavelength of a light emitted from the semiconductor light emitting element 2, wherein the semiconductor light emitting element 2 emits an ultraviolet light, and the ceramic phosphor 11 corresponding to the semiconductor light emitting element 2 has: a minimum transmission of 0.1 to 40% under a wavelength of 350-420 nm; and a transmission of 10 to 90% under an emission peak wavelength of the ceramic phosphor.

Provided are a novel nitrogen-containing heterocyclic derivative having a specific structure and an organic electroluminescence device having an organic thin film layer composed of one or a plurality of layers including at least a light emitting layer and interposed between a cathode and an anode, in which at least one layer of the organic thin film layer contains the nitrogen-containing heterocyclic derivative alone or as a component of a mixture. As a result, a novel nitrogen-containing heterocyclic derivative useful as a component of an organic electroluminescence device can be provided, and an organic electroluminescence device being driven at a low voltage and having high luminous efficiency, excellent electron transporting property, and high emission luminance can be realized by using the nitrogen-containing heterocyclic derivative in at least one layer of its organic thin film layer.

A blue organic electroluminescent device (1) including at least an emitting layer (40) between an anode (20) and a cathode (60), the emitting layer (40) including a host material and a plurality of dopants, at least one of the dopants having ultraviolet luminescent properties.

An object of the present invention is to provide a light-emitting element with high luminous efficiency, and a light-emitting element of low-voltage driving. Another object of the present invention is to provide a light-emitting device with low power consumption by using the light-emitting element. Another object of the present invention is to provide an electronic appliance with low power consumption by using the light-emitting device in a display portion. A light-emitting element includes, between a pair of electrodes, a layer containing a composite material of a first organic compound and an inorganic compound and a layer containing a second organic compound being in contact with the layer containing the composite material, wherein the second organic compound does not have a peak of an absorption spectrum in a wavelength region of 450 to 800 nm if the second organic compound is compounded with the inorganic compound.

Disclosed is a carbazole derivative and a light-emitting element, a light-emitting device, and an electronic device using thereof. The carbazole derivative possesses an oxadiazole moiety or a quinoxaline moiety as a heteroaromatic ring having an electron-transporting property and a carbazole moiety having a hole-transporting property. The ability of the carbazole derivative to transport both electrons and holes and its large excitation energy larger than a triplet excitation energy of a phosphorescent compound allow the formation of a phosphorescent light-emitting element having well-controlled carrier balance, which contributes to the formation of light-emitting devices and electronic devices that are capable of being driven at a low voltage, have a long lifetime, and consume low power. The detailed structure of the carbazole derivative is defined in the specification.

A light-emitting element (10) is provided with a thin-film crystal layer which includes a buffer layer (22), a first-conductivity-type semiconductor layer, an active structure (25) and a second-conductivity-type semiconductor layer. In the thin-film crystal layer, at least a part of the second-conductivity-type semiconductor layer is covered with an insulating film. The insulating film has a crystal quality improving layer (30) for recovering crystallinity of the thin-film crystal layer.

Disclosed is a long-life organic EL device having high luminous efficiency even after storage at high temperatures. Also disclosed is an aromatic amine derivative which enables to realize such an organic EL device. The aromatic amine derivative is represented by the following general formula (1).

(In the formula (1), Ar1 is represented by the general formula (2) below, and Ar2 is represented by the general formula (3) below.)

The present invention discloses a novel heterocyclic compound of Formula (1) and an organic electroluminescent device using the same, in which variables are as described herein. The heterocyclic compound of Formula (1) is present in the emitting layer as a light emitting host in combination with a dopant and another host, in the organic electroluminescent device and high luminous efficiency and low driving voltage are achieved.

The present invention provides an organic EL device having a high luminous efficiency and a long life, and an iridium complex compound used for preparing the above device.

The iridium complex compound is represented by the following Formula (1):

[in Formula (1), R¹ to R⁴ are each independently a specific group; at least one of R¹ to R⁴ is a group having 2 or more carbon atoms; R⁵ to R⁸ are each independently a specific group; and at least one of R⁵ to R⁸ is a specific electron-withdrawing group; (with the proviso that R¹ to R⁸ are not combined with each other to form rings)].

A nitrogen-containing aromatic heterocyclic derivative represented by the following formula, wherein X₁ to X₃ are a single bond, CRaRb, NRc, an oxygen atom or a sulfur atom, and when all of X₁ to X₃ is a single bond, at least one of Ara, Arb and Arc is an aryl group having 6 to 20 ring carbon atoms substituted with a heteroaryl group, an aryloxy group or a heteroaryloxy group, or a substituted or unsubstituted heteroaryl group having 5 to 20 ring atoms.

Disclosed is an organic light emitting display (OLED) device that may include first and second electrodes facing each other on a substrate, at least two light emitting units between the first and second electrodes, and a charge generation layer between the at least two light emitting units, the charge generation layer including an N-type charge generation layer and a P-type charge generation layer, wherein the N-type charge generation layer includes at least two hosts and a dopant, and wherein the at least two hosts have different lowest unoccupied molecular orbital (LUMO) energy levels.

A red phosphorescent compound, includes a host material being capable of transporting an electron or a hole; and a dopant material represented by the following formula 1:

wherein each of R1 to R4 is selected from the group consisting of hydrogen atom (H), C1 to C6 alkyl and C1 to C6 alkoxy, and at least one of R1 to R4 is C1 to C6 alkyl, and wherein each of R5 to R7 is selected from the group consisting of hydrogen, C1 to C6 alkyl and pyrrole, and at least one of R5 to R7 is pyrrole, and wherein each of X and Y is selected from the group consisting of H, non-substituted C1 to C6 alkyl and C1 to C6 alkyl substituted by fluorine.

Provided is a compound for an organic optoelectric device, an organic light emitting diode including the same, and a display device including the organic light emitting diode, wherein the compound for an organic optoelectric device is represented by Chemical Formula 1. The Chemical Formula 1 and description thereof are the same as described in the specification.

The invention provides a composite transparent fluorescent ceramic chip and preparing method for white LEDs, the composite transparent fluorescent ceramic chip is the integral structure of two or more small ceramic units connected in the cross section, the small ceramic unit is a light pixel, the light color of the each lighting pixel is more than two, after being excited by the LED chip, the composite transparent fluorescent ceramic chip emits white light. Compared with the existing technology, the different lighting pixel points are compound on the same ceramic chip according to the principle that the three base colors of red light, blue light and green light are mixed into white light, the problem of uneven dispersion of phosphor particles in organic materials, the scattering of surface light and the loss of red components, and the like are overcome, the technical scheme has the advantages of high conversation efficiency, high color index, long life, good heat stability and adjustable color temperature.

A carbazole compound represented by the following formula:

Provided are a hole-injecting material for an organic electroluminescent device (organic EL device) exhibiting high luminous efficiency at a low voltage and having greatly improved driving stability, and an organic EL device using the material. The hole-injecting material for an organic EL device is selected from benzenehexacarboxylic acid anhydrides, benzenehexacarboxylic acid imides, or N-substituted benzenehexacarboxylic acid imides. Further, the organic EL device has at least one light-emitting layer and at least one hole-injecting layer between an anode and a cathode arranged opposite to each other, and includes the above-mentioned hole-injecting material for an organic EL device in the hole-injecting layer. The organic EL device may contain a hole-transporting material having an ionization potential (IP) of 6.0 eV or less in the hole-injecting layer or a layer adjacent to the hole-injecting layer.

A material for an organic photoelectric device includes a compound represented by the following Formula 1:

An aromatic heterocyclic derivative represented by the following formula (1), a material for an organic electroluminescence device and an organic electroluminescence device including these:

The invention relates to an indium-arsenic (InAs) quantum dot active region structure. The structure comprises n InAs quantum dot layers (1), wherein n is greater than or equal to 1 and is a natural number; and an InGaAs layer and an InAs quantum dot layer in which an In component is increased linearly and an InGaAs layer and a cover layer in which the In component is decreased linearly are grown on each of the indium-arsenic quantum dot layers (1) in turn epitaxially from the top to the bottom. The invention also relates to an InAs quantum dot light emitting device, in which a GaAs buffer layer, a lower cladding layer, a lower limit waveguide layer, the InAs quantum dot active region structure, an upper limit waveguide layer, an upper cladding layer and an ohmic contact layer are epitaxially grown a GaAs substrate from the bottom to the top in turn. The InAs quantum dot active region structure and the light emitting device can reduce a pressure stress born by InAs quantum dots, inhibit the precipitation of indium in the quantum dots, reduce the accumulated strain of a quantum dot active region structure, and reduce defects and malposition. Therefore, the InAs quantum dots and a corresponding light emitting device have higher luminous efficiency and luminous intensity.

When one row electrode has been selected with a selection signal, driving signals are supplied to column electrodes so as to cause electroluminescence elements at corresponding display pixels to emit light. The driving period for impressing the driving signals and emitting light from the corresponding display pixels is determined on the basis of the color of the display pixel that is to emit light. Thus, with a simple configuration, the brightness of each color can be made uniform without the use of pulse width modulation or the like.

The present application relates to an opto-electronic device. The opto-electronic device includes a first light-emitting structure and a second light-emitting structure. The first light-emitting structure is capable of generating a first light having a first wavelength. The second light-emitting structure is capable of generating a second light having a second wavelength. The first light-emitting structure includes a nanorod structure having a first active layer, and the first active layer can absorb the second light to generate the first light.

An electron transport layer includes an electron transport material (host material) and a carrier transportable dopant. The carrier transportable dopant is contained 1% by weight to 50% by weight, preferably 1% by weight to 10% by weight for the electron transport material. A compound having a carbazole group or a derivative of the compound is employed as the carrier transportable dopant. A complex of an 8-hydroxyquinoline derivative and metal is employed as the electron transport material.

Provided is a compound for an EBL capable of improving the light emitting efficiency, stability and life span of a device, and an organic electric element and an electronic device using the same.

Disclosed are amine-substituted naphthalene derivatives and organic light emitting diodes including the same. In the organic light emitting diodes, at least one of the amine-substituted naphthalene derivatives is employed in a hole auxiliary layer interposed between a hole transport layer and a light emitting layer to enable efficient hole transport to the light emitting layer, achieving high luminous efficiency and long lifetime.

The present invention discloses a fluorescent substance for low voltage exciting source, wherein the host lattice of the fluorescent substance is composed of metal ions and silica, and the host lattice is further doped with activator. Furthermore, the general formula of the fluorescent substance is (Sr_2-x-yM_xEu_y)SiO₄ (x≧0, y>0, x+y<2), wherein M comprises at least one kind of metal ion except Sr or Eu. The wavelength of the light emitted from the fluorescent substance can be shifted by introducing M into the lattice structure, so that the provided fluorescent substance is able to emit lights with various colors from yellow to yellow-green. Additionally, the provided fluorescent substance with single phase can be fabricated in a variety of methods, such as solid state reaction method, co-precipitation method, gel method and micro emulsion method.

Provided are an organic electric element comprising as a phosphorescent host material, a mixture of the compounds of Formula (1) and Formula (2), and an organic electronic device or apparatus thereof for achieving a high luminous efficiency, a low driving voltage, and an improved lifespan.