188results about How to "Improve electroluminescence performance" patented technology

The invention relates to a method of growing a ZnS:Mn phosphor layer suitable for use in thin-film electroluminescent components. According to the method, the ZnS:Mn phosphor layer is grown on a substrate by means of the ALE method using volatile zinc, sulfur and manganese compounds as the precursors. According to the invention, an organozinc compound such as diethylzinc or dimethylzinc is used as precursor for zinc, hydrogen sulfide or an organosulfur compound is used as precursor for sulfur, and an organomanganese compound or organic manganese complex compound is used as precursor for manganese. The invention provides a display component with drive-voltage-symmetrical light emission and stable characteristics of luminance level and turn-on voltage.

The invention provides a quantum dot printing ink and a preparation method thereof, and a quantum dot light emitting diode, belonging to the technical field of quantum dot luminescence. The quantum dot printing ink comprises, on the basis that the weight percentage content of the quantum dot printing ink is 100%, 0.1 to 20.0% of quantum dot, 0.1 to 15.0% of a charge transferring agent, 40.0 to 90.0% of a solvent, 0.1 to 15.0% of a viscosity conditioning agent and 0 to 15% of a dispersing agent, wherein the solvent comprises a main solvent and a cosolvent. The quantum dot printing ink provided by the invention contains the charge transferring agent capable of facilitating charge transfer, so charge transfer of a quantum dot luminescent layer prepared from the quantum dot printing ink is more effective; thus, threshold voltage is reduced, and energy efficiency is improved.

An electroluminescent device comprises a cathode, an anode, and has therebetween a light emitting layer (LEL), the device further containing an electron transport layer (ETL) on the cathode side of the LEL and an organic electron injection layer (EIL) contiguous to the ETL on the cathode side, wherein the ETL contains a monoanthracene compound bearing aromatic groups in the 2-, 9-, and 10-positions.

An electroluminescent device comprises a cathode, an anode, and has therebetween a light emitting layer (LEL), the device further containing an electron transport layer (ETL) comprising an anthracene compound on the cathode side of the LEL and an organic electron injection layer (EIL) between the ETL and the cathode comprising a phenanthroline compound, wherein the thickness of the EIL and LEL are such that the ratio of the thickness of the EIL to LEL is greater than 0.125.

The invention relates to a quinoxaline unit containing organic thermally activated delayed fluorescent material and an application thereof. The organic thermally activated delayed fluorescent material, which contains a quinoxaline unit and has good light emitting performance, is obtained through carrying out multiaspect modification by taking quinoxaline with high electrophilicity as a core and constructing different D-A structures by particularly introducing fluorine atoms with high electro-withdrawing power to molecular design for the first time, so that efficient light-emitting elements are obtained, and the thinking of people that conventional fluorescent materials are free of halogens is broken through. The organic thermally activated delayed fluorescent material is simple in synthesis and high in yield and has the advantages of practical large-scale production and application. The [delta]E(S1-T1) of the organic thermally activated delayed fluorescent material is not greater than 0.65eV, so that the organic thermally activated delayed fluorescent material can be applied to the evaporation-coating of devices and can also be applied to the spin-coating of the devices. Electroluminescent elements and luminescent devices with high efficiency, high brightness, low-efficiency attenuation and low trigger voltage are provided through using the novel thermally activated delayed fluorescent material, so that the organic thermally activated delayed fluorescent material can be extensively applied to the field of organic electroluminescence.

The invention discloses a derivative with electroluminescent and electrochromic characteristics and a complex thereof. Specifically, a series of mono-branched and poly-branched structures are obtained by taking 4-phenyl terpyridyl as a terminal group and connecting electron-attracting groups (such as nitro, aldehyde group and carboxyl group) or push donor groups (such as hydroxyl, a diphenylamine derivative and a triphenylamine derivative). A general formula is shown in the specifications. The triple pyridine derivative disclosed by the invention has superior light stability, superior thermal stability and remarkable electroluminescent characteristic; a metal complex of the derivative has remarkable triplet luminous characteristic, and can be applied to an OLED (Organic Light Emitting Diode) luminous material; and more importantly, the metal complex has superior electrochromic characteristic, and is suitable to be taken as a smart off-color material.

The invention discloses a thermal activation delayed fluorescence material based on a dibenzophenazine derivative as well as a preparation method and application of the thermal activation delayed fluorescence material, and belongs to the technical field of organic photoelectric materials and devices. The structural formula of the material is shown as a formula (I), in the formula (I), R1 is phenoxazinyl, phenothiazinyl or dimethyl acridinyl, R1' is phenoxazinyl, phenothiazinyl or dimethyl acridinyl, R1 '' is phenoxazinyl, phenothiazinyl or dimethyl acridinyl, and R2 is H, phenoxazinyl, phenothiazinyl or dimethyl acridinyl. The material provided by the invention has the advantages that the electron acceptor and the electron donor unit show a highly distorted rigid structure, 100% theoretical internal quantum efficiency can be realized, the fluorescence quantum yield is high, a guarantee is provided for a high-efficiency long-waveband OLED device, and the like. And a polysubstitution mode is adopted, so that red shift of molecular emission wavelength is facilitated, long-waveband luminescence is realized, and a guarantee is provided for an efficient long-waveband OLED device.

The invention belongs to the field of electroluminescence, and specifically discloses a tetraphenyl ethylene derivative and a white organic electroluminescent apparatus containing the same. According to the tetraphenyl ethylene derivative disclosed by the invention, a tetraphenyl ethylene derivative matrix is taken as a luminescent main body structure, and same substituents are connected to 4,4',4'',4'''-sites of an end group, so that the level structure of molecules is conveniently adjusted through a full-guache conformational isomer, a semi-guache conformational isomer and a plane guache conformational isomer so as to obtain a plurality of luminous zones. A remarkable H-aggregation state fluorescence enhancement characteristic is displayed, and a white luminescent apparatus can be obtained by compounding the luminous zones in multiwave bands as a single luminescent layer component to obtain the white organic electroluminescent apparatus which is high in thermal decomposition temperature, excellent in electroluminescent performance, short in synthetic line and easy to industrialize. The white organic electroluminescent apparatus prepared by the tetraphenyl ethylene derivative has important application value in the field of organic electroluminescence.

The invention discloses an N-phenylcarbazole derivative with a structure as shown by the accompanying drawing and application thereof to electrophosphorescent devices, wherein A does not contain any group, or A is substituted or unsubstituted phenylene, substituted or unsubstituted biphenylene, or pyridyl / pyrazinyl; and R1 and R2 are hydrogen, diphenylphosphoryl, cyano group, 3-pyridyl, 4-pyridyl, 2-dibenzothienyl / furyl and 4-dibenzothienyl / furyl. The N-phenylcarbazole derivative disclosed by the invention has the advantages that the conjugate degree of main body materials can be effectively reduced, the molecular weight of compounds is increased, the doublet energy level and the glass transition temperature of the materials are improved to a certain extent, the polarity can be adjusted through electron-donating / electron-withdrawing groups, and compared with the performance of commonly used phosphorescent main body materials, the performance of phosphorescent OLED (Organic Light Emitting Diode) devices is effectively improved and the N-phenylcarbazole derivative can be widely used in the field of organic electroluminescence.

The invention discloses a rotaviral tetraene fluorescent compound, a preparation method and application thereof, and an electroluminescent device. The structural general formula of the rotaviral tetraene fluorescent compound is as follows, wherein Ar1 is phenyl, 1-naphthyl or 2-naphthyl, and Ar2 is phenyl, 1-naphthyl or 2-naphthyl. A special rotaviral tetraene conjugate rigid structure containing heteroatoms is utilized and connected with a blue luminophore with high quantum efficiency, so as to obtain the rotaviral tetraene fluorescent compound. Thus, a more distorted molecular structure is achieved; pi-pi accumulation between molecules is reduced; meanwhile, the conductivity of the fluorescent compound is improved. By adopting the rotaviral tetraene fluorescent compound, stabilization of an apparatus is facilitated; excellent electroluminescent properties are obtained; development of an efficient full-color display is facilitated; the rotaviral tetraene fluorescent compound can be widely applied to OLED (organic light-emitting diode) large-screen display and OLED white-light illumination with high brightness demands.

The invention develops a method, which adopts cheap and easily-available raw materials, is free of a noble metal catalyst, is simple and convenient to operate, gentle in reaction condition, low in production cost, high in yield and convenient for commercialization, for synthesizing pyridine and carbazole-series compounds by virtue of a one-step process, relates to the field of organic electroluminescence materials, and particularly relates to a material synthesized by virtue of the one-step process and provided with bipolar carrier transmission performance as well as an application of the material as an electroluminescent phosphor to the electroluminescence field. The material provided with the bipolar carrier transmission performance not only contains a carbazole unit with hole transport performance, but also contains a pyridine unit with electron transport performance; and the compounds are 2,4-dicarbazolyl pyridine, 2,3- dicarbazolyl pyridine, 2,3,5,6-tetracarbazolyl pyridine and 2, 3, 4, 6- tetracarbazolyl pyridine respectively.

The present invention relates to a beta-diketone ligand and its europium coordination compound and europium coordination compound electroluminescent device. The ligand is the transmission group with carrier, for example, beta-diketone ligand of carbazyl or oxazolyl, and the chemical formula of europium coordination compound is Eu(DBM)n(R-DBM)3-nBath, n=1.2, Bath=4,7-diphenyl-1,10-o-phenan-throline. The electroluminescent device includes conductive glass substrate layer, hole transmission layer, luminous layer and cathode layer, and the luminous material of luminous layer adopts the above-mentioned europium coordination compound.

The invention discloses a preparation method for carbon quantum dots having controllable electroluminescent and photoluminescent performances. The preparation method includes the steps of: regulating the pH of a sucrose water solution to alkaline with sucrose as a carbon source, inserting a working electrode, intensively stirring the solution, and applying a voltage to carry out a reaction to obtain a product solution; collecting the product solution and separating out salts to obtain a carbon quantum dot solution; vacuum freeze-drying the carbon quantum dot solution to obtain a powdery solid, which is the carbon quantum dots having the controllable electroluminescent and photoluminescent performances. The method is carried out in a water solution system with the sucrose as a carbon source in an electrochemical manner, wherein different surface passivators are added to the reaction system to control the electroluminescent and fluorescent performances of the carbon quantum dots; in addition, the carbon quantum dots having excellent electroluminescent and fluorescent properties can be obtained without complex subsequent modification treatment, so that the carbon quantum dots has great application value in the fields of fluorescence and electroluminescence, and also has excellent application prospect.

The invention discloses a red organic fluorescence material containing a benzothiadiazole derivative, namely 4,7-bis(10-(4-(tert-butyl) phenyl)-10H-phenothiazine-3-yl) diazosulfide as well as a preparation method and application of the red organic fluorescence material, and belongs to the technical field of organic optoelectronic materials. The red organic fluorescence material is characterized inthat 10-(4-(tert-butyl) phenyl) phenothiazine is used as a donor, and 10-(4-(tert-butyl) phenyl) phenothiazine with a D-A-D structure is obtained by a phenothiazine 3rd-bit bridging mode of benzothiadiazole; due to peculiar properties of a tert-butyl phenyl group, the dissolving processing performance and electronic transmission performance of a derivative compound donor material are improved, carrier support is more balanced in transportation and the luminous efficiency is improved; the prepared compound has high thermal stability and chemical stability and proper energy level, and can be applied to the field of organic electroluminescence as a red light material; and a prepared organic electroluminescence device has the characteristics of lower drive voltage, higher current efficiency,external quantum efficiency and the like and obtains higher electroluminescence.

An electroluminescent device comprises a cathode, an anode, and has therebetween a light emitting layer (LEL), the device further containing an electron transport layer (ETL) on the cathode side of the LEL and an organic electron injection layer (EIL) contiguous to the ETL on the cathode side, wherein the ETL contains a monoanthracene compound bearing aromatic groups in the 2-, 9-, and 10-positions.

The invention relates to a tertiary butyl-containing spirobifluorene compound and preparation and application thereof. The material has the following general formula (I) shown in the description, wherein R is a structure shown in the description; -Ar shown in the description, wherein -Ar is selected from at least one of the following structural units or derivatives of the following structural units: shown in the description; in the above mentioned structural formulas, m and n are integers of 0 to 8, and R1, R2, R3 and R4 are hydrogen, or straight chains or branched chains or ring alkyl or oxyalkyl chains with 1 to 22 carbon atoms, and can be the same or different. Compared with the prior art, the tertiary butyl-containing spirobifluorene compound disclosed by the invention has the advantages that 4,4'-ditert-butyl-2-brominated biphenyl with low cost replaces 2-brominated biphenyl which is generally used in the conventional 9,9'-spirobifluorene preparation process and is high in cost, and the synthesis method has the characteristics of low cost, simple synthesis route, high yield, easiness in industrial production and the like; a spirobifluorene hole-transmission / electroluminescent material is high in hole-transmission performance and electroluminescent performance.

A method for preparing nano pipe sodium titanate / metatitanic acid, comprising the following steps: (1) mixing the compound containing titanium with the strong alkaline solution with the wight proportion being 20-80%; (2) heating and backflowing in the microwave oven for 10 minitues-20 hours; (3) cooling and depositing the reacted mixing liquid, washing the deposite to make the pH be 6-8, separating and getting the nano pipe sodium titanate, immersing the product got in the above reaction in strong acid for 3-72 hours, washing, drying and getting the nano pipe metatitanic acid. The invention is characterized by the temperated reacting condition, fast reaction velocity, high performance and cost ratio of the product and being suited to produced industrially.

The invention provides a red organic electrophosphorescent material iridium metal complex with the structure represented by formula (1). In the formula (1), R is a hydrogen atom or a C1-C4 straight chain or alkoxy group. The red organic electrophosphorescent material iridium metal complex is prepared through the following steps: carrying out a Grignard reaction on an iridium metal complex to prepare a compound C, carrying out dehydration cyclization on the compound C to obtain a cyclomedtalating ligand, carrying out a polymerization reaction on the cyclomedtalating ligand and chromium trichloride hexahydrate in a 2-ethoxyethanol and water mixed solvent to obtain a chlorendic dimer, and carrying out a complex reaction on the chlorendic dimer and acetylacetone to obtain the red organic electrophosphorescent material iridium metal complex represented by formula (1). The above material has good energy transmission efficiency and appropriate red light emitting wavelength, and can be widely used to make red or white phosphorescent electroluminescent devices in order to reduce the power consumption of the devices, improve the performances of the devices and prolong the life of the devices.

The invention discloses bipyridine fluorene derivatives, a preparation method and application thereof, and an electroluminescent device. The molecular structure general formula of the bipyridine fluorene derivatives is shown as a figure in the specification. According to the bipyridine fluorene derivatives, bipyridine fluorene with special electron transmission performance is connected with a triphenylamine group with high hole transmission speed on the 9-position of fluorene; due to strong steric hindrance of the 9-position of fluorene, a more distorted molecular structure is realized, the triple state energy level of a host compound is enhanced, and the glass transition temperature of the host compound is increased. The bipyridine fluorene derivatives are used for preparing a high-efficiency electroluminescent device, so stability of the device is promoted, the device can achieve excellent electroluminescent performance, and development of a high-efficiency full-color display is promoted.

The invention belongs to the field of organic optoelectronic materials, and discloses an organic light-emitting material containing tetraphenylbenzene, preparation and application. The structural formula of the organic light-emitting material containing the tetraphenylbenzene is shown in the formula I, wherein R1 is an aromatic nucleus derivative electron-donating group, and R2 is an aromatic nucleus derivative electron-withdrawing group. The preparation method comprises the steps that 1,4-dibromo-2.5-terphenyl and R2-substituted phenylboronic acid are used as raw materials, and an aromatic nucleus compound containing the R2 is obtained through a Suzuki reaction; under the action of a tetrakispalladium catalyst, the aromatic nucleus compound containing the R2 and R1-substituted phenylboronic acid or borate are reacted, and the organic light-emitting material containing the tetraphenylbenzene is obtained. The organic light-emitting material containing the tetraphenylbenzene has the advantages of efficient solid-state lighting and double polarity, and the organic light-emitting material can be used for preparing an organic light-emitting device which is high in efficiency, low in roll-off degree and non-doped with blue light.

The invention discloses an organic dual-functional device and a preparation method thereof. The device comprises a transparent substrate, an anode layer, a hole transport layer, an organic active layer, an electron transport layer and a cathode layer. Under the drive of an applied forward voltage, the organic dual-functional device can achieve an electroluminescence function; and under the drive of an applied backward voltage, the device can achieve an ultraviolet detection function. The organic dual-functional device simultaneously has electroluminescence and ultraviolet detection dual-functions, has the characteristics of being high in efficiency, ultra-thin and integrated, and is simple in preparation technology, short in preparation time and low in cost.

The invention relates to a bisphenothiazine dioxide derivative and an application thereof, and belongs to the field of organic photoelectric material. Different aryl dibromides are adopted as a parent body and are connected with phenothiazine dioxide to form the bisphenothiazine dioxide derivative; with introduction of -SO2-, the compound has good electron transmission performance, and the electronic affinity of the compound and the stability of the compound in air are improved. The bisphenothiazine dioxide derivative can be used as an OLED luminescent device, is suitable for use as an electron transmission material of a blue fluorescent material and as a green phosphorescence electron transmission material and also has the potential of red color application, so that the bisphenothiazine dioxide derivative can be applied to a red-green-blue tri-phosphor doped main body material and also can be independently used as a hole transmission material, an electron transmission material or a luminescent layer.

The invention relate to red light organic electroluminescence device and its manufacture method. By intermingling fluorescence dye C545T(density: 0.2%-2%) which function as sensitizer and red light organic dye(density: 0.5%-5%) with 8- hydroxyl quinoline aluminium, electroluminescence device with a structure of IT0 / NPB / ALq3:C545T:red light dye / Alq3 / liF / Al can be produced. The device is driven by direct current, producing the luminescence of red light dye. Compared with the electroluminescence device without sensitizer C545Tú¼its luminescence efficiency and brightness has been improved markedly, thus commendably realizing red organic electroluminescence.

The invention discloses an organic optoelectronic material with the indeno-phenanthroline structure and a preparing method and application thereof, and belongs to the technical field of organic optoelectronic materials. The organic optoelectronic material has the molecular structure shown in the formula I (please see the specification), wherein R1 and R2 are one of hydrogen, phenyl and dibenzofuran, R3 is one of hydrogen, phenyl, polycyclic conjugation aryl with the 10-60 carbon number and aromatic heterocyclic radical containing N, S and O atoms. As the organic optoelectronic material contains the indeno-phenanthroline structure, the larger rigid flat structure is formed, the high electron mobility and the large electron affinity are provided, and transmission of injected electrons is greatly improved.

The invention relates to an oxidized thieno-bi-carbazole derivative and applications thereof, which belong to the field of organic photoelectric materials. In a compound, an electron withdrawing group -SO- or -SO2- is introduced at 7- and carbazole derivatives are introduced at two ends so as to form the oxidized thieno-bi-carbazole derivative; the general formula of the oxidized thieno-bi-carbazole derivative is as shown in the specification, wherein -SO- or -SO2- has excellent electron transportation performance, thereby enhancing the electron affinity of the compound and the compound stability in air; simultaneously carbazoles with excellent hole transportation performance are introduced at the two ends, so that a transportation material with double polarity is formed. The oxidized thieno-bi-carbazole derivative can serve as a transportation material and a light emitting material of an OLED (Organic Light Emitting Diode) device, and the prepared OLED device has the effect characteristics of high brightness, high efficiency and low voltage.

The invention discloses a one-step synthetic method for diphenyl sulfone series compounds, wherein the method has the advantages of cheap and easily available raw materials, no need for a noble metal catalyst, simple and convenient operation, mild reaction conditions, low production cost, high yield and convenience in commercialization. The invention relates to the field of organic electroluminescent materials, specifically to a material having bipolar carrier transport performance and synthesized by using the one-step method, and application of the material as an electrophosphorescent main body in the field of electroluminescence. The material with the bipolar carrier transport performance contains different donor units with hole transport performance and a diphenyl sulfone unit with electron transmission performance. The compounds provided by the invention comprise 4,4'-dicarboline diphenyl sulfone, 4,4'-di(1,2,3,4-tetrahydro-carbazole)diphenyl sulfone, 4,4'-di(7-azaindole)diphenyl sulfone and 4,4'-diindolyl diphenyl sulfone.

Two different organic fluorescent dyes are selected as doping materials to be adulterate into 8-aluminum hydroxy quinoline. Their weight percent is as 0.2%-5%:0.2-5%:1. Alq3 / LiF / Al organic light emitting device is prepared with ITO / NPB doping layer. Carrier capture process is existed between organic fluorescent dyes and between each fluorescent dye and material of main body. Electroluminescence capability of organic LED is improved by using capture principle of waterfall carrier. Organic LED prepared by using the disclosed method possesses features of high efficiency, large brightness and good spectral color purity.

The invention discloses a synthesis method of pyridine and carboline series compounds through one step, and relates to the field of organic electroluminescence materials, in particular to a material synthesized through a one-step method and with the bipolar carrier transport performance and application of the material used as an electrophosphorescent body to the electroluminescence field. The synthesis method has the advantages that raw materials are cheap and easy to obtain, noble metal catalysts are not needed, operation is easy and convenient, a reaction condition is mild, production cost is low, the yield is high, and commercialization is facilitated. Carboline with both the hole transport capacity and the electron transport capacity and electron withdrawing group pyridine are connected, and then body materials of 2, 6-CbPy and 2, 4, 6-CbPy with the more balanced hole transport and electron transport capacity are obtained.

The invention discloses triphenylethylene derivatives and an application thereof. The triphenylethylene derivatives have a structure represented by a formula (I), wherein A represents spirofluorene triphenylamine and spirofluorene triphenylamine derivatives in different sites. According to the triphenylethylene derivatives in different sites, the conjugation can be effectively controlled through site regulation, and undoped fluorescent devices with different light colors are obtained; compared with a common fluorescent guest material, the material has the advantages that the structure of an OLED (organic light emitting diode) device utilizing the material as a luminous layer can be effectively simplified, the cost is greatly saved, high-efficiency fluorescent devices are obtained, and the triphenylethylene derivatives can be widely applied to the field of organic electroluminescence.

The invention discloses a star-shaped compound which uses hexafluorenylbenzene as a skeleton. Six functionalized alkylaryl and heterocycle-substituted fluorine are simultaneously connected onto a benzene ring. The synthesis method of the star-shaped compound is simple and feasible and can be widely used. A hexafluorenylbenzene derivative provided by the invention can be used as luminescent layers and hole transport layers for making electroluminescent devices, has the advantages of high efficiency, high brightness and high spectrum stability, and can be widely used in the field of organic electroluminescence.