46results about How to "High electroluminescence efficiency" patented technology

An organic electroluminescent device (OELD) with improved luminescent efficiency has been fabricated upon inclusion of an inorganic buffer layer in the hole injecting or electron injecting regions. The structure of the device can be as follows (from bottom to top): ITO\buffer layer\NPB\Alq\Mg:Ag. In comparison with devices without the buffer layer, the present OELD may be more efficient in a proper bias condition.

The invention pertains to an organic light emitting diode (LED) comprising a transparent electrode, superposed by a layer of a conductive transparent polymer (CTP), superposed by a layer of a light emitting polymer, oligomer, or low molecular weight compound superposed by a metal cathode, characterized in that the CTP layer has a sulfate ion content of less than 7,500 ppm, and a metal ion content of more than 0.04 mmoles / g.

The invention provides a light emitting diode. The light emitting diode comprises a substrate, positive pole, hole transfer layer, emitting layer, electron transport layer and negative pole. The emitting layer comprises quantum dots and energy transfer molecules. The energy transfer molecules crosslink with the quantum dots by click chemistry. The energy transfer molecules, as dispersion medium of the quantum dots, have high electron / hole carrier injection ability, which can promote the production of excitons in energy transfer molecules and realize effective energy transfer from energy transfer molecules to fluorescent quantum dots. At certain voltage, the device can emit within the wavelength range of 380-900nm, with the maximum emitting peak covering ultraviolet to dark red light range. The invention further discloses the fabrication method and electronic display equipment of a light emitting diode.

The present invention relates to organic electroluminescent compounds represented by Chemical Formula 1 or 2, a process for preparing the same, and an organic light emitting diode (OLED) which comprises, as a luminescent region interposed between an anode and a cathode, at least one compound (s) selected from those represented by Chemical Formula 1 or 2, and at least one compound selected from anthracene derivatives, benz[a]anthracene derivatives and naphthacene derivatives. The electroluminescent compound according to the present invention is a green electroluminescent compound having maximized electroluminescent efficiency and lifetime of device.

The invention belongs to the technical field of organic electroluminescence material, in particular to a series of phosphorescent dye parent materials with a tetrahedral structure, and the application of the materials in an electroluminescent device. The phosphorescent dye parent materials can be used for a panel display device, a light-emitting diode (LED) and an electronic imaging device. The phosphorescent dye parent material has excellent electronic and hole transmission properties, can be independently used as a luminous layer and a current carrier transmission layer, and can be used as matrix and doped with other fluorescent or phosphorescent dyes. The compound has stronger fluorescent property in a state of solution or solid, can be used for forming an even film, and has better optical stability and thermal stability. R1, R2, R3 and R4 are respectively connected with phenyl group by a single bond, and are respectively selected from one of hydrogen, alkyl group, alkoxy, nitryl, hydroxyl, cyano-group, benzene cyano-group, amino, sulfydryl, halogen, diphenyl phosphoryl, furan, thiophene, pyrrole, pyridina, diazine, triazine, pyran, quinoline, benzpyrole, carbazole, aniline or phenothiazine, and X is C or Si.

The invention relates to an ionic iridium metal complex, which can be used as a material of a luminous layer in an electrochemical cell luminescent device. The complex has a general formula shown in the specifications, wherein a first ligand C-N is an aromatic heterocyclic compound obtained by coordinating sp2 hybrid C atoms and sp2 hybrid N atoms; a second ligand is 2-(1H-imidazole-2-radical) pyridine and a derivative thereof; R, R' and R'' are substituent groups on the second ligand; R'' is a group with high steric hindrance; R and R' are respectively and independently one of hydrogen atoms, fluorine atoms, trifluoromethyl, C1 to C30 alkyl, C1 to C30 alkoxy, C2 to C 30 alkyl amino, C6 to C20 aryl, C6 to C20 fused ring aryl, C4 to C20 heterocyclic ring aryl, and C6 to C30 arylamine groups; and A is a counter anion with one negative charge. The complex of the invention has the advantages of high heat stability, high luminous efficiency in solution and a high-concentration doped solid thin film, easy adjustment of emitting colors of the material, simple synthetic process, easy purification and the like.

Carbazolyl-functional linear polysiloxanes containing N-carbazolylalkyl groups and hydrolysable groups, a silicone composition containing a carbazolyl-functional linear polysiloxane, a curd carbazolyl-functional polysiloxane prepared by curing the silicone composition, and an organic light-emitting diode (OLED) containing a carbazolyl-functional polysiloxane.

The invention provides a light emitting diode apparatus. The light emitting diode apparatus comprises a substrate, a positive electrode, a hole transport layer, a light emitting layer, an electron transport layer and a negative electrode; the light emitting diode apparatus is characterized in that the light emitting layer is formed by quantum dots and energy transfer molecules in a combination manner; and the energy transfer molecules and the quantum dots are crosslinked through click chemistry. The energy transfer molecules, used as the dispersion medium of the quantum dots, have high electron / hole carrier injection capability, so that exciton generation in the energy transfer molecules can be promoted, and effective energy transfer from the energy transfer molecules to fluorescent quantum dots can be realized; and at a certain voltage, the apparatus can give out light within a wavelength range of 380-900nm, and the maximum emitting peak value is from ultraviolet light to deep infrared light. The invention also discloses a preparation method of the light emitting diode apparatus and electronic display apparatus.

This invention relates to compositions and electroluminescent (EL) devices that have enhanced performance as a result of a mixture of isomeric aromatic amine (IAA) compounds. The mixture can be vacuum evaporated to form amorphous thin films.

The invention provides a quantum dot. The quantum dot comprises a CdSe core, a first shell layer and a second shell layer, wherein the CdSe core is covered with the first shell layer, the first shell layer is covered with the second shell layer, the first shell layer serves as an excition limiting layer, the second shell layer serves as a stress compensation layer, the first shell layer is a ZnS layer, and the second shell layer is a ZnCdS layer. Due to the design of the external shell layers of the CdSe colloid quantum dot, the CdSe / ZnS / ZnCdS colloid quantum dot with the stress compensation function is synthetised. Compared with a traditional CdSe / ZnCdS / ZnS quantum dot, the quantum dot has the advantages that the photoluminescence quantum yield is higher, the photoluminescence efficiency of a semiconductor light emitting diode made of the quantum dot is higher, the spectral purity is higher under the high injection current condition, and thus the quantum dot is more suitable for manufacturing of a high-definition display screen.

This invention relates to compositions and electroluminescent (EL) devices that have enhanced performance as a result of a mixture of isomeric aromatic amine (IAA) compounds. The mixture can be vacuum evaporated to form amorphous thin films.

An organic electroluminescent material and a device using the same wherein the electroluminescent material is a charge transport indenofluorene selected from one of Formula (I) and Formula (II) wherein R and R′ are independently selected from the group consisting of a hydrogen atom, halogen atom, cyano, alky, alkoxyl, alicyclic alkyl, substituted or unsubstituted aryl or heteroaryl, and dialkylamino; m and n are numbers of 0 to 4; R1, R2, R5, and R6 are independently selected from the group consisting of hydrogen, an alkyl, a substituted or unsubsituted aryl, or an heteroaryl, an alkoxy, and vinyl; R3 and R4 are independently selected from the group consisting of a hydrogen atom, halogen atom, alkyl, alkoxy, and substituted or unsubstituted aryl or heteroaryl; and p is 1 or greater.

A semiconductor laser device that has the effect of phonon-assisted light amplification and a method for manufacturing the same are proposed. A conductive layer is formed on a semiconductor silicon substrate. A current flow is used to accomplish electro-luminescence of silicon. A silicon dioxide nanometer particle layer is sandwiched between the conductive layer and the semiconductor silicon substrate to form a MOS junction for carrier confinement. The phonon-assisted light emission mechanism can thus be strengthened to enhance the electro-luminescence efficiency of silicon so as to accomplish the lasing effect.

The invention belongs to the field of organic electroluminescence and particularly relates to luminescent molecules containing electron donor-acceptor (D-A) groups, and their application in blue organic electroluminescent device. The compounds are prepared via classical aromatic coupling reaction and used for luminescent layers of electroluminescent devices. The compounds have a structure shown in formula I shown in the description, wherein aryl Ar is any one of benzene, naphthalene, anthracene, fluorene or spirofluorene, and Ar variation is effective in adjusting luminescent color and the like. The compounds synthesized herein are simple to prepare and high in yield, and present deep blue to pure blue, and even near-ultraviolet fluorescence-emission; by using the compounds with Ar as phenyl to act as a luminescent layer, it is possible to acquire a near-ultraviolet electroluminescent device with starting voltage of 3.2 V, maximum external quantum efficiency of 6.57% and luminescent intensity of 408 nanometers.

The invention relates to a highly effective two-tone white light high molecular material and it's preparing method in the field of lighting material technology. The chemical structure of the highly effective two-tone white light high molecular material is as the right type, wherein x=0.00001-0.5. The preparing method is that it uses polymer fluorenes as blue light structure unit, 4, 7-2 (4-(N-phenyl -N-(4-methyl phenyl) amino) phenyl)-2, 1, 3 -benzodithiazole as orange light structure unit, it uses combined polymerization mode to lead the orange light work unit into the blue light macromole fundamental chain by chemical key mode to prepare for the highly effective two-tone white light high molecular material.

The invention discloses an amboceptor polysubstituted carbazole compound with TADF (thermal active delay fluorescence), a preparation method of the compound and an application of the compound. The structure of the compound is as shown in the specification. The preparation method of the compound includes the steps: taking polyfluorinated 1, 4-double (5-phenyl-1, 3, 4-oxadiazole-2) benzene derivative or perfluorinated 4, 4'-dimethyl-1, 1'-biphenyl as a raw material; adding carbazole, alkali and organic solvents; performing reaction on mixture in nitrogen atmosphere to obtain the compound. The TADF material has high PLQY (photoluminescence quantum yield) under pure solid state and high electroluminescence efficiency when serving as a luminescence objected to be applied into OLEDs (organic light emitting diodes).

The invention discloses a novel organic metal iridium complex, a preparation method thereof, and an organic electroluminescent device containing the metal iridium complex. The structural general formula of the novel organic metal iridium complex is shown in the specification. According to the novel metal iridium complex provided by the invention, the compound wavelength is adjusted by selecting specific heterocyclic ligand for combination, and after the obtained organic metal compound is used in an organic electroluminescent device, the light-emitting efficiency of the organic electroluminescent device is improved, and the service life is long.

The invention relates to the field of organic semiconductor, and discloses a spiro[fluorene-xanthene] and triphenylamine unit copolymer blue-light host material, and a preparation method and an application thereof. The host material has a structural general formula as the following. In the formula, R1 and R2 are both C1-C20 alkyl, and n is an integer within a range of 10-100. In the spiro[fluorene-xanthene] and triphenylamine unit copolymer blue-light host material, fluorene has a planar biphenyl structure which has relatively high rigidity; anthracene has relatively high fluorescence quantum yield; and polytriphenylamine derivative is a type of important electroluminescent polymer with good hole mobility. Alkoxylation modification is performed on site 4, such that the solubility and film-forming property of the polytriphenylamine derivative are improved. Spiro[fluorene-xanthene] is introduced to the main chain of polytriphenylamine, such that organic electroluminescent device efficiency improvement is facilitated.

The invention relates to the field of organic small molecule light emitting diodes, and discloses a single-layer doped electron transport layer green phosphorescent device and a preparation method and application thereof. According to the high-efficiency green phosphorescent device provided by the invention, a naphthyl anthryl modified triazinyl organic small molecular electron transport material is introduced. An anthracene unit has a steric hindrance effect with naphthyl and anthryl which are respectively substituted at 9 and 10 positions of the anthracene unit, so that on one hand, formation of an amorphous state can be promoted, and on the other hand, triplet-state energy transfer between the light-emitting layer and the electron transport layer can be blocked. A 1, 3, 5-triazine unit with strong electricity absorption is beneficial to improving the electron injection and transmission performance.

The invention relates to an arylamine compound and application thereof in an organic electronic device, and the arylamine compound has a structure shown in a formula (1): according to the arylamine compound, a plurality of conjugated systems are introduced on a triphenylamine unit, so that the influence of nitrogen atom lone pair electrons on a C-H bond on a triphenylamine benzene ring is effectively dispersed, and the stability of the compound is improved. The compound has a stable chemical structure and a long device service life, contains an organic functional structure unit and a group capable of generating non-conjugated bond crosslinking, and has good solubility, film-forming property and good solvent resistance after curing, so that the compound can be used as a hole transport layer material in a solution organic electroluminescent element, and can be applied to the field of organic electroluminescent devices. Therefore, the invention provides a manufacturing technical scheme which is low in manufacturing cost, high in electroluminescence efficiency and long in device service life.

Belonging to the field of organic semiconductors, the invention discloses a phosphine sulfur group electron transport material, a preparation method and application thereof. The structural formula of the host material is shown as the specification. In the phosphine sulfur group electron transport material provided by the invention, dibenzofuran has a large plane rigid structure; and the diphenyl diphenyl phosphine sulfur group contains electron-withdrawing P=S, and is a good electron transport unit. Thus, the material has high electron mobility and good thermal stability, and can be used as an electron transport layer in organic electroluminescent devices to improve the luminous efficiency.

The present invention provides high quality monodisperse or substantially monodisperse InAs nanocrystals in the as-prepared state. In some embodiments, the as-prepared substantially monodisperse InAs nanocrystals demonstrate a photoluminescence of between about 700 nm and 1400 nm.

The invention belongs to the field of organic electroluminescent materials, and discloses a bipolar polymer blue light host material, a preparation method and applications thereof. The structural formula of the host material is shown in the description, wherein in the formula, the R represents a C1-C20 alkyl group, and the n represents an integer in a range of 10 to 100. In the provided bipolar polymer blue light host material, the diphenyl phosphine oxide contains an electron-absorbing structure P=O, which is a good electron transmission unit; the carbazole is an important electroluminescent material, and has an excellent hole transmission performance, and the nitrogen atom of carbazole can be modified by an alkyl group so as to improve the solubility and film-forming performance of copolymerized carbazole. Diphenyl phosphine oxide is introduced into the main chain of carbazole based polymer to achieve the carrier balance of electroluminescent devices so as to improve the luminescent efficiency of organic electroluminescent devices.

The invention belongs to the field of organic semiconductors, and discloses a phosphinosulfenyl electron transfer material, a preparation method and an organic electroluminescent device. The structural formula of the above host material is shown in the specification. In the phosphinosulfenyl electron transfer material, diphenylphosphinoquinoline has a large planar rigid structure; and a diphenylphosphinosulfenyl group contains electron-withdrawing P=S, and is a very good electron transfer unit, so the material has high electron mobility and good thermal stability, and can be used in the organic electroluminescent device as an electron transfer layer to improve the luminescence efficiency.

A furodiazole derivative containing carbazolyl and its electroluminescent device are disclosed. The device includes conductive glass lining layer, cavity transmission layer, luminescent layer, electronic transmission layer and cathode layer. The luminescent materials can be europium complex, terbium complex, transition metal iridium and platinum complex, main materials are chosen from one 1,3,4- furodiazole containing carbazolyl. It has efficient transmission and better luminescent performances and larger power.

The invention belongs to the technical field of luminescent materials, and relates to a metal organic complex as well as a preparation method and application thereof, in particular to a metal organic complex as shown in a formula I as well as a preparation method and application thereof. The complex disclosed by the invention can be used for realizing artificial regulation and control on luminescence, and realizing ligand-induced intermolecular L' LCT room-temperature phosphorescence, metal d orbit-participated MLCT room-temperature phosphorescence and intramolecular charge transfer-induced delayed fluorescence. The metal complex disclosed by the invention can emit thermally activated delayed fluorescence, and full-wave-band luminescence regulation and control in a visible light region are realized. When the metal complex provided by the invention is used for preparing an OLED device, very high electroluminescence efficiency can be realized.

The invention belongs to the field of organic electroluminescent materials, and discloses a bipolar polymer blue light host material, a preparation method and applications thereof. The structural formula of the host material is shown in the description, wherein in the formula, the R represents a C1-C20 alkyl group, and the n represents an integer in a range of 15 to 100. In the provided bipolar polymer blue light host material, the diphenyl phosphine oxide contains an electron-absorbing structure P=O, which is a good electron transmission unit; the carbazole is an important electroluminescent material, and has an excellent hole transmission performance, and the nitrogen atom of carbazole can be modified by an alkyl group so as to improve the solubility and film-forming performance of copolymerized carbazole. Phenanthroline has a big planar rigid structure, and phosphine oxide-carbazole can be introduced into the main chain of the phenanthroline polymer so as to improve the luminescent efficiency of organic electroluminescent devices.

The invention belongs to the field of organic semiconductor materials, and discloses a bipolar blue-light emitting host material, and a preparation method and an application thereof. The structural formula of the host material is shown in the specification. In the bipolar blue-light emitting host material, a carbazole group is an excellent hole transport unit; anthracene has a high fluorescence quantum yield; and a diphenylphosphinosulfenyl group contains electron-withdrawing P=S, and is good electron transfer unit, so the material has hole transport and electron transfer properties to realize hole and electron transfer balance in a luminescent layer, and has a high triplet energy level to effectively prevent the return of energy to the host material in a luminescence process in order to substantially improve the luminescence efficiency.

The invention relates to an organic compound, a polymer, an organic mixture, a composition and an organic electronic device. the above compound has the structure as shown in the general formula (I), wherein L1 is selected from an aromatic ring system group having 8 to 40 fused ring atoms, a substituted or unsubstituted heteroaromatic ring system group having 8 to 40 fused ring atoms, an aryloxy group having 5 to 40 ring-forming atoms, and a heteroaryloxy group having 5 to 40 ring-forming atoms. A is the structure with the general formula (II); B is the structure with the general formula (III-1) or the general formula (III-2). The above organic compound has excellent hole-transport property and stability, and can form a co-subject by cooperating with another subject with electron-transportproperty or bipolar property, and an organic luminescent device with high electroluminescent efficiency and long life can be obtained.

The invention belongs to the field of organic electroluminescent materials, and discloses a bipolar polymer blue light host material, a preparation method and applications thereof. The structural formula of the host material is shown in the description, wherein in the formula, the R1 and R2 both represent a C1-C20 alkyl group, and the n represents an integer in a range of 10 to 100. In the provided bipolar polymer blue light host material, the diphenyl phosphine oxide contains an electron-absorbing structure P=O, which is a good electron transmission unit; the carbazole is an important electroluminescent material, and has an excellent hole transmission performance, and the nitrogen atom of carbazole can be modified by an alkyl group so as to improve the solubility and film-forming performance of copolymerized carbazole. Diphenyl phosphine oxide is introduced into the main chain of carbazole based polymer to achieve the carrier balance of electroluminescent devices so as to improve the luminescent efficiency of organic electroluminescent devices.