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 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 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.

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.

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 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 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 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 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.