165results about How to "Reduce the lighting voltage" patented technology

The invention relates to an organic light emitting diode with a double-layer electron transport layer and a preparation method thereof. The preparation method is characterized in that the double-layer electron transport layer is prepared by a solution method, namely, an ultra-thin acetylacetonate metal salt film is deposited on a light emitting layer of the device by the solution method first, and then a zinc oxide nano particle film is deposited on the ultra-thin acetylacetonate metal salt film by the solution method, thus realizing preparation of the double-layer electron transport layer through a full solution method. By adopting the method to prepare the electron transport layer of the organic light emitting diode, injection and transport of electrons in the device can be improved, charge transfer between the light emitting layer and the zinc oxide layer can be effectively inhibited, the device is enabled to get light emitting efficiency a hundred times higher than that of a conventional device, and the device has lower driving voltage and higher brightness. The method of the invention is widely used in the field of organic light emitting devices.

The invention relates to an organic electroluminescent device which utilizes a high-conductivity hole-transporting material as the hole-transporting layer. The hole-transporting layer of the high-conductivity hole-transporting material is formed by doping an organic main body material and high-conductivity metal oxide. The metal oxide doped with a hole-filling transporting layer of the organic main body has very high conductivity, and the conductivity is between 10<-10> to 10<-6>s/cm; the electroluminescent device has the advantages of low turn-on voltage and high efficiency, the turn-on voltage is between 2.5-2.8 volts, the maximum current efficiency is 15.4-18.5 candelas/ampere (cd/A), and the maximum power efficiency is between 14.1-21.4 lumens/watt (lm/W).

The invention relates to the field of fluorescence carbon nanomaterials, in particular to a high-quantum-yield eigenstate-fluorescence-adjustable carbon dot and a preparing method and application thereof. Diaminonaphthalene or a hydroxyl, carboxyl, methyl, ethyl, N,N-dimethyl and N,N-diethyl substituted ramification of the diaminonaphthalene and citric acid serve as carbon source precursors, an eigenstate fluorescence carbon dot solution can be obtained through a solvothermal method. The prepared eigenstate fluorescence carbon dot has the beneficial effects of being high in crystallization, high in surface passivation degree, even in nitrogen doping, even in size distribution and the like, and has the wide application prospect.

The invention relates to an organic electroluminescent material and an application thereof. The electroluminescent material has a molecular structure as shown in a formula (I), has relatively good thin film stability and suitable molecular energy level, can serve as a hole-transport material, and is applied to the field of organic electroluminescent.

The invention belongs to the field of organic electroluminescent materials and particularly relates to a novel thermal-activated-delayed-fluorescence luminescent material and an application thereof. The material is characterized by comprising a structure represented by a formula (1) shown in the description, wherein R1 and R2 each is any one independently selected from a group consisting of a hydrogen atom, a C3-C30 substituted or unsubstituted carbazolyl group, a C3-C30 substituted or unsubstituted arylamine group, a C3-C30 substituted or unsubstituted phenothiazine group, a C3-C30 substituted or unsubstituted phenoxazine group, a C3-C30 substituted or unsubstituted phenazine group and a C3-C30 substituted or unsubstituted acridine group, and R1 and R2 are not hydrogen simultaneously; and R3 is any one selected from a group consisting of hydrogen and C1-C10aliphatic straight-chain or branched-chain alkane. The material provided by the invention is stable in property, has good luminescent performance and is applied to organic electroluminescent devices as a luminescent material.

The invention relates to an organic electroluminescent material and a preparation method thereof and an organic electroluminescent device. According to the organic electroluminescent material, a benzo[g] bending structure is adopted as the center, a first benzene ring is introduced into the site g of the benzo[g] bending structure, then a second benzene ring is used for replacing hydrogen groups on the first benzene ring, a nitrogen heterocyclic ring is used for replacing hydrogen groups on the second benzene ring, and the following structure shown in the description is achieved, wherein Ar is a nitrogen heterocyclic ring with the electron transport function. Compared with the prior art, the organic electroluminescent material has a very proper triplet state energy level, high glass-transition temperature, good heat stability and high carrier transport capacity, the preparation method is simple, operation is easy, the yield is high, and cost is low; the organic electroluminescent material serves as a main material to replace CBP to manufacture the organic electroluminescent device, lower turn-on voltage and higher maximum current efficiency are achieved, the turn-on voltage can be reduced by 0.5-1.1 V, and the maximum current efficiency can be improved by 18% to 24%.

The invention discloses a multi-functional modified phenyl ether single phosphine oxide main material, a synthetic method and an application thereof, relates to an organic electroluminescence material, preparation and application thereof and solves the problems of low luminous efficiency and brightness of existing organic electroluminescence materials and contradiction between high triplet state excited state energy level and good carrier injection/transmitting capacity. The preparing method of parent structure of the multi-functional modified phenyl ether single phosphine oxide main material includes adding N-bromo-succinimide in 2-diphenyl phosphine oxide phenylate to perform bromination reaction; and introducing a functional group with a carrier transmission characteristic to perform a substitution reaction, and extraction, drying and column chromatography are performed to obtain the multi-functional modified phenyl ether single phosphine oxide main material. The multi-functional modified phenyl ether single phosphine oxide main material has the advantages that the voltage of lightening an electrophosphorescent device is reduced, the luminous efficiency and brightness of the organic electroluminescence material are improved, and the material is mainly used for an organic electrophosphorescent diode device.

The invention provides a novel organic light-emitting material. The novel organic light-emitting material is used for a light-emitting main body material and an electron transport layer material of anorganic light-emitting device. The invention also provides an organic light-emitting device comprising the novel organic light-emitting material.

The invention provides dihydro acridine derivatives, application thereof and an organic electroluminescent device applying the same. The diphenyl phosphine oxide substituted dihydro acridine derivatives have a structural formula shown in the formula (1) in the specification and are used as phosphorescence main material in an organic electroluminescent device. The an organic electroluminescent device applying the compounds has higher current efficiency, and start voltage is reduced effectively.

The invention discloses a preparation method for a chalcogenide semiconductor/carboxylation PPV (polyphenylene vinylene) electroluminescence composite material. The electroluminescence composite material is prepared by means of complexation between semiconductor metal salt and carboxylation PPV firstly and then by means of hydrothermal reaction, the semiconductor metal salt is selected from soluble nitrate or halide of Zn, Cd, Pb or Bi, and the carboxylation PPV refers to poly[2-methoxy-5-(5'-carboxypentyloxy) p-phenyl acetylene]. The carboxylation PPV serving as an organic phase to be doped and composited with an inorganic semiconductor, and the carboxylation PPV is connected with the inorganic semiconductor by means of coordination bonds, so that inorganic particles are uniformly dispersed, the two phases form a uniform system, energy and charge transfer on the two phase interfaces is improved, the composite material has processibility of polymer and photoelectric property of semiconductor materials, and the novel electroluminescence material high in stability and luminous efficiency is provided for the fields such as large-area flexible display and solid-state luminescence and the like.

The invention belongs to the field of organic electroluminescence materials, and particularly relates to an organic electroluminescence material comprising a 4,5-diazaspiro thioxanthone structure, application of the organic electroluminescence material, and a device; the organic electroluminescence material can be used for OLEDs (Organic Light Emitting Diodes), has very good bipolar transmission property and can be used as a main material. A structural formula is as shown in the description, wherein Ar1 and Ar2 are independently selected from hydrogen atoms, substitutive or non-substitutive carbazole groups of C3 to C30, substitutive or non-substitutive arylamine groups of C3 to C30, substitutive or non-substitutive phenothiazine groups of C3 to C30, substitutive or non-substitutive phenoxazine groups of C3 to C30, substitutive or non-substitutive phenazine groups of C3 to C30 and substitutive or non-substitutive acridine groups of C3 to C30, and Ar1 and Ar2 are not hydrogen at the same time. The invention also relates to the device comprising at least one layer of bipolar compound as a main body, and a method for manufacturing the device.

The invention discloses a six-arm stellate organic light-emitting material and an organic electroluminescent device adopting the material. The structure of the six-arm stellate organic light-emitting material is shown by a formula (I), six-arm isotropic molecules ordered in height and of three-dimensional structures are formed by utilizing a P-type group with carbazole as a representative, connecting N-para C atoms with trimerized carbazole and then using Sp3 hybridized N atoms as linkage to connect a N-type group with dicyanobenzene as a representative, the advantage of a specific micromolecular structure is kept by utilizing an alkyl chain or and alkoxy chain for solubilization promotion, and the compound also has good branch and polymer solubleness and wettability and facilitates solution processing for film formation. A light-emitting layer of the organic electroluminescent device is made by adopting ink-jet printing, the six-arm stellate organic light-emitting material serves as a main light-emitting material or an object doped material to be applied to the light-emitting layer of the organic electroluminescent device, and pure red light emission is obtained.

The invention relates to an organic electroluminescent material, a preparation method and applications thereof. The material is an organic micromolecular material, which takes 1,5-naphthyridine as the center and has a parallel ring structure, and the structure of the material is represented in the description. In the structural formula, the Ar1 and Ar2 individually represent an aromatic ring with/without a substituent or an aromatic heterocyclic ring with/without a substituent, and further represent a benzene ring, naphthalene ring, pyridine, [1,8]naphthyridine, pyrimidine or triazine with/without a substituent, wherein the Ar1 and Ar2 can be same or different. The provided material has a proper molecular energy level and high glass-transition temperature, so the material can be used as a phosphorescent main material and can be used to prepare the functional layer and especially the luminescent layer of an organic electroluminescent device in the organic electroluminescent field.

The invention discloses a dibenzofuranyl aromatic phosporic-oxygenic compound and a preparation method and application thereof, relating to the dibenzofuranyl aromatic phosporic-oxygenic compound and the preparation method and the application thereof. The problems of low luminous efficiency and brightness and poor stability of an electrophosphorescent device, caused by serious concentration quenching and a triplet annihilation effect existing in the traditional electrophosphorescent material, are solved. In a general structural formula of the compound, X represents H or diphenyl phosporic-oxygenic group. The preparation method comprises the following steps of: preparing a derivative by using dibenzofuran, butyl lithium, tetramethylethylenediamine and diphenylphosphine chloride; dissolving the derivative in CH2CI2; adding H2O2; reacting; and thus obtaining the compound. In the application of an organic electrophosphorescent device, the compound is used as a main material of a luminescent layer. The diphenyl phosporic-oxygenic group is modified on a chromophore patent body through a C-P saturated bond to prepare electro blue/electro white/electro green main materials which are high in triplet excited state energy level and have good carrier injection and transmission capacity, and the prepared device has extremely low driving voltage, excellent brightness and stable efficiency.

The invention discloses an organic electroluminescence device. The organic electroluminescence device comprises a substrate, a first electrode, a hole injection layer, a hole transmission layer, an organic light emitting layer, an electron transmission layer, an electron injection layer and a second electrode, wherein the substrate, the first electrode, the hole injection layer, the hole transmission layer, the organic light emitting layer, the electron transmission layer, the electron injection layer and the second electrode are sequentially stacked. The hole injection layer comprises two thin inorganic nano-rod films which are vertically stacked. The inclination angles of inorganic nano-rods of the thin inorganic nano-rod film at the side close to the substrate are smaller than the inclination angles of inorganic nano-rods of the thin inorganic nano-rod film at the side far away from the substrate. The thin inorganic nano-rod film with the smaller inclination angles is beneficial to the increase of the effective contact area between the hole injection layer and an adjacent electrode layer, the barrier height, from an anode to the hole injection layer, of a hole is effectively reduced, and the starting voltage and the working voltage are reduced. The thin inorganic nano-rod film with the larger inclination angles can effectively adjust the balance of electrons and the hole, the gap scattering property of the inclined nano-rods is used, so that on the premise that power efficiency is not sacrificed, the luminous efficiency is improved. The invention further discloses a preparing method of the organic electroluminescence device.

The invention provides an organic compound, and an electron transport material and applications thereof, wherein the organic compound has a structure represented by a formula I. According to the invention, through the special design of a molecular structure and a substituent group, tridentate coordination or tetradentate coordination can be generated between the organic compound and a metal, so that the organic compound can be stably and firmly combined with the metal, the organic compound has high stability and long service life when being used as an electron transmission material, and the problem of drift voltage rise is effectively improved; the organic compound has large rigid distortion, so that the increase of intermolecular attraction can be inhibited, and the excessive intermolecular attraction caused by formation of a planar structure can be avoided; and the organic compound used as an electron transport material can be applied to an electron transport layer and/or an electroninjection layer of an OLED device, so that the luminous efficiency of the device can be effectively improved, the service life of the device can be effectively prolonged, and the turn-on voltage canbe reduced.

The invention discloses a multifunctional modified tert-butyl carbazole phosphine oxide main material and a synthesis method and an application thereof, and relates to an organic electroluminescent material and a synthesis method and an application thereof, which are used for solving the problem that the turn-on voltage of an electroluminescent device applied to an organic electroluminescent main material is on the high side. Six kinds of main materials are available; in 2 kinds of main materials, one or two phosphine oxide functional groups with carrier transmission characteristic are introduced to a tert-butyl carbazole parent respectively; and in the other 4 kinds of main materials, one, two or three phosphine oxide functional groups with carrier transmission characteristic are introduced to a 9-phenyl tert-butyl carbazole parent respectively. The tert-butyl carbazole is used as the parent of the main material; since the diphenylphosphine oxide matrix structure has the conjugation breaking effect of the P=O group, the parent has relatively high triple-stage energy level, as well as certain electron injection and transmission capacity, and the luminous efficiency and brightness of a luminous device are improved after the parent is applied to the luminous device; and meanwhile, the turn-on voltage can be reduced to 2.4V.

The invention belongs to the field of organic electroluminescence, and specifically relates to a bipolar host organic electroluminescent material and an application thereof. The bipolar host organic electroluminescent material provided by the invention has high current carrier injection and transport capabilities and good hole and electron transporting bipolar characteristic, so an organic electroluminescent device prepared by using the bipolar host organic electroluminescent material provided by the invention has the advantages of low starting voltage, high luminous efficiency, etc.; the bipolar host organic electroluminescent material has large molecular weight, high glass transition temperature and thermal decomposition temperature and high compound stability, and is favorable for significantly improving the service life of a device; the bipolar host organic electroluminescent material has high singlet and triplet energy levels and can be preferably used as a green light host material; and the device prepared by using the bipolar host organic electroluminescent material provided by the invention as a host material can effectively improve external quantum efficiency, power efficiency and current efficiency.

The invention discloses a fluorine-substituted 9,9'-dianthracene blue light emitting host material and its application. The position and the number of a peripheral strong electrophilic group fluoro or trifluoromethyl are changed to realize a high fluorescence quantum efficiency and a good luminescence peak blue shift, and realize dark blue light emission by cooperating with an appropriate host (CBP); and the position and the number of the peripheral strong electrophilic group fluoro or trifluoromethyl are changed to make the material have an appropriate highest occupied molecular orbital and a lowest unoccupied orbital energy and realize good overlapping of the emission spectrum and the absorption spectrum of an object DPAVBi, so energy can be effectively absorbed and transferred to the object, thereby the luminescence of the object is caused, and the performances of a device are improved. The material has the advantages of good heat stability, good luminescence performance, easy synthesis and convenient purification, and can be widely used in the fields of organic field effect transistors, organic electroluminescent devices, the organic lasers and organic photovoltaic solar batteries.