38results about How to "Suppression of nonradiative transitions" patented technology

The invention discloses preparing methods of carbon quantum dots and a phosphorescence composite material of the carbon quantum dots. The carbon quantum dots are synthesized through aniline monomers such as 3,5-diaminobenzoic acid, 2,4-diaminobenzenesulfonic acid and 2,6-diaminotoluene under the room-temperature condition. The composite material is compounded by the water-soluble carbon quantum dots and a hydrophilic poymer such as polyacrylic acid, sodium polyacrylate, polyacrylamide, polymaleic anhydride, polymaleic acid and sodium polystyrenesulfonate. The preparing technology is simple, the raw materials are easy to obtain, the cost is low, and the preparing method is poisonless and environmentally friendly. The carbon quantum dots are diversified, and have the advantages of being highin fluorescence quantum efficiency, good in water solubility and the like; the phosphorescence composite material is diversified, long in phosphorescence service life at the room temperature, and excellent in phosphorescence performance and has a huge application prospect in the fields of counterfeiting prevention, display, biological and chemical detection and the like.

The invention discloses a cuprous complex luminescent material capable of emitting orange-yellow phosphorescent light and a preparation method thereof. The phosphorescent complex of the luminescent material is obtained by carrying out complexing on a monovalent copper salt with a ligand; the molecular structure of the phosphorescent complex is [Cu(QBO)(PPh3)2]PF6, and in the formula, PPh3 and QBO are electrically neutral ligands triphenylphosphine and 2-(2-benzoxazole) quinoline. The complex has the advantages of easy micromolecular purification and high luminous efficiency, and also high thermal stability. The material is obtained by directly mixing and reacting Cu(CH3CN)4PF6 with a dichloromethane solution of the ligands, and has the advantages of simple and convenient process, simple equipment, easily available raw materials, low cost and the like. The material can be taken as a photoluminescent orange-yellow-light material and also can be used as a luminescent layer phosphorescent material in an electroluminescent device composed of a plurality of layers of organic materials.

The invention belongs to the field of organic light-emitting materials, and particularly discloses a carborane derivative. The structural formula is as follows: (img file='DDA0001282150470000011.TIF' wi='435' he='543' /), R1 and R2 is H or a derivative of phenanthrene, and R1 and R2 are not H together. The carborane derivative disclosed by the invention has the following advantages: through charge transfer emission and/or localized state emission, the emission wavelength of the compound can be accurately regulated, so that a series of white light molecules are obtained; by introducing the carborane group, luminescence quenching caused by the aggregation of solid state molecules is prevented, the absolute luminescence quantum yield is high, and the carborane derivative has good properties, such as good thermal stability and easy sublimation, and has actual application value.

Provided is a method for preparing an OLED light-emitting device with a metal-enhanced fluorescence outer conversion layer. The invention provides a preparing method for a metal-enhanced fluorescence layer and an OLED device based on the method. The preparing method for the metal-enhanced fluorescence light-emitting layer includes the following steps of firstly, preparing a nanometer metal particle layer, wherein the nanometer metal particle layer is obtained by forming a metal film through vacuum evaporation and then conducting thermal treatment; secondly, preparing an organic fluorescence material solution, and evenly mixing the fluorescence material in high-molecular polymers; thirdly, preparing the metal-enhanced fluorescence outer conversion layer. The structure is prepared on the outer side of glass of an OLED, surface plasmas are formed on light waves emitted by the OLED device and metal nanometer particles on the outer side of the glass through the structure, and therefore the luminous intensity of fluorescent molecules is enhanced through the strong partial enhancing characteristic of the surface plasmas, the photoluminescence of the metal-enhanced fluorescence outer conversion layer of the OLED device is greatly enhanced. The OLED device with the metal-enhanced fluorescence outer conversion layer is simple in preparation process, low in device requirement and short in preparation cycle.

Disclosed is an iridium complex phosphorescent material based on a main ligand containing a rigid aromatic amine functional group. The structural general formula is shown in the description. The electron-rich aromatic amine group contained in the luminescent material can ensure that the luminescent material has good carrier injection/transmission ability. According to the invention, the aromatic amine group in the luminescent material is locked by a single bond so as to prevent free rotation of a benzene ring on the ligand, inhibit non-radiative transition of a complex and enhance luminescentability of the complex. Meanwhile, the rigid structure can adjust an interaction mode among molecules in an aggregation state, change transition dipole orientation of the luminescent molecules, and help to enhance the luminescence properties of corresponding organic light-emitting diodes.

The invention provides an organic thermally-induced delayed fluorescence material based on a pyrazine receptor as well as a preparation method and application of the organic thermally-induced delayed fluorescence material, and belongs to the technical field of organic light-emitting diodes. Four organic thermally-induced delayed fluorescence materials are synthesized by taking a pyrazine receptor as a core, and corresponding organic light-emitting devices containing the pyrazine receptor-based organic thermally-induced delayed fluorescence materials are provided according to different organic thermally-induced delayed fluorescence materials. The organic thermally-induced delayed fluorescent material has small [delta]Est and large f and shows good TADF characteristics, and the pyrazine structural unit has certain rigidity, can well inhibit non-radiative transition and improve orange/red light emission efficiency, has wide application prospects and is expected to be widely applied to the fields of panel display, solid-state illumination and the like.

The invention belongs to the field of photoelectric material applied technologies, and particularly relates to a thermally activated delayed fluorescence material with a phenanthroimidazole structure,an application of the material and an electroluminescence device. The phenanthroimidazole structure rich in electrons and holes and a phenazine structure are connected through an aromatic group to form the material, and the delayed fluorescence material simultaneously meets a larger radiation transition constant kr and a smaller single-triplet-state energy gap delta EST. Dense donor-receptor group combinations effectively avoid energy consumption of triplet-state charge reaction caused by electron and hole carrier density imbalance of a device, so that the problem of roll off of the device isimproved. The phenanthroimidazole structure and the phenazine structure are designed, orbital overlap is effectively increased, molecular rigidity is increased, non-radiation transition is restrained, luminous efficiency of the device is effectively improved, and the material is an excellent luminous layer object material, emergent layer material and luminous layer subject material.

The invention relates to the technical field of organic photoelectric materials, in particular to guest materials of a phosphorescent material, the phosphorescent material and a method for adjusting the luminescent property of the phosphorescent material. The structural formula of the guest materials of the phosphorescent material is as shown in the specification. In the structural formula, R1 is selected from H and a phenyl group. The phosphorescent material comprises at least one of the guest materials and a host material, wherein the host material comprises diphenyl sulfoxide and/or diphenyl sulfone. The phosphorescent material also comprises water and/or a protonic acid. The novel guest materials of the phosphorescent material provided by the invention can be doped with the diphenyl sulfoxide or diphenyl sulfoxide host material to obtain the phosphorescent material; and meanwhile, a third component is introduced on the basis, a hydrogen bond can be formed with host molecules, a matrix network can be effectively cured, non-radiative transition of guest excitons can be further inhibited, phosphorescence quantum yield is remarkably increased, and phosphorescence service life is remarkably prolonged.

The invention discloses a fluorene spirotriphenylamine derivative compound and a preparation method and application thereof, the structural formula of the fluorene spirotriphenylamine derivative compound is as follows: a series of fluorene spirotriphenylamine derivative organic light-emitting small molecules are prepared by introducing groups with different steric hindrances into ortho-positions of triazine based on triphenyltriazine as an electron withdrawing and triphenylamine as an electron donating; the fluorene spirotriphenylamine derivative has very good luminous intensity and extremely high fluorescence quantum yield; excited state configuration change and non-radiative transition of molecules are regulated and controlled through a steric effect, so that high efficiency of the molecules is realized; the compound can be used as a novel luminescent molecule with good performance, low cost and high luminescent intensity; the fluorene spirotriphenylamine derivative compound has remarkable economic value in the application aspects of preparation of luminescent materials, luminescent devices or intelligent materials and the like, and has a good application prospect in the fields of full-color display and solid-state illumination.

The invention discloses a pure organic phosphorescence small molecule material used for methanol solvent identification, and a preparation method for the pure organic phosphorescence small molecule material. The pure organic phosphorescence small molecule material is characterized in that only methanol can be used for activating room-temperature phosphorescence emission. In the pure organic phosphorescence small molecule material, a high-selectivity co-crystallization function between organic small molecules and methanol molecules can be used to form a solvate crystal, the rigidity of a systemeffectively inhibits the non-radiative transition of triplet state energy, and therefore, the selective activation of a phosphorescence emission solvent is realized.

The invention relates to a carbazole-thiophene pyrazine derivative, and a preparation method, application and a device thereof. The carbazole-thiophene pyrazine derivative provided by the invention uses carbazole-thiophene pyrazine as basic structural units, uses cavity groups for modification and then obtains an ambipolar structure. The high glass transition temperature is realized; good stability is realized. Compared with the conventional green light doping material in common use in the prior art, the carbazole-thiophene pyrazine derivative has the advantages that when the carbazole-thiophene pyrazine derivative is used as a green light illumination material to be applied to an organic electroluminescence device, the energy transmission insufficiency and the separation between a main body and an object can be effectively avoided; the device driving voltage, illumination brightness, external quantum efficiency, rolling falling and the like are obviously improved; the material belongsto an ideal green light emitting material.

The present invention relates to an ionic phosphorescent metal complex, and a preparation method and application thereof. The structure of the complex is represented by a general formula (I) as shownin the specification. In the formula (I), R1 and R2 are the same or different, and are independently selected from alkyl, aryl and heteroaryl groups; the alkyl, aryl and heteroaryl groups are optionally substituted by the group consisting of halogen, an alkyl group, an alkoxy group, an alkylthio group, an amino group, an alkylamino group, a dialkylamino group, an arylamino group, a diarylamino group, a halogenated alkyl group, a cyano group, a nitro group, an alkenyl group, an aryl group and a heteroaryl group optionally substituted by 1 to 3 aryl groups; R3 is one optionally selected from thegroup consisting of halogen, an alkyl group, a haloalkyl group, an alkoxy group, an alkylthio group, an amino group, an alkylamino group, a dialkylamino group, a cyano group, a nitro group, an alkenyl group and the like; and M is optionally selected from Cu (I), Ag (I) and Au (I). The invention further relates to an organic light-emitting diode and a preparation method and application thereof. The organic light-emitting diode prepared by taking the phosphorescent metal complex as a light-emitting layer dopant has high-performance organic electroluminescence and can be applied to illuminationand panel display.

The invention relates to the technical field of electronic materials, in particular to a binuclear metal complex and an organic electroluminescent device. The binuclear metal platinum complex provided by the invention has a structure as shown in a formula I, and has high luminous efficiency and excellent thermal stability, so that an OLED device prepared from the binuclear metal platinum complex as a luminous layer material shows high external quantum efficiency and relatively low luminous efficiency roll-off.

The invention provides a red-light thermally-induced delayed fluorescence material and a preparation method thereof, and an organic electroluminescent device. The red-light thermally-induced delayed fluorescence material provided by the invention is a red-light thermally-induced delayed fluorescence material with a multi-arm star-shaped structure as shown in a formula (I), the band gap is narrow, and the energy level difference between a first excited singlet state and a first excited triplet state is small, so that the compound has a red-light thermally-induced delayed fluorescence emission property. Moreover, a rigid truxene ketone acceptor unit contains three carbonyl groups, the reverse intersystem crossing rate of the electroluminescent material based on a truxene ketone derivative is favorably improved by utilizing the high intersystem crossing rate of the carbonyl groups, and meanwhile, the rigid plane structure is favorable for inhibiting non-radiative transition and improving the luminescent property of the material. Meanwhile, the truxene derivative as shown in the formula (I) has a multi-arm star-shaped structure, so that the weakening of intermolecular interaction is facilitated, the solubility of the material is improved, and a solution processing device is facilitated.

The invention provides a pyrene fused ring molecule bridged with a tripolyindole structure. The pyrene fused ring molecule is shown as a formula (I) or a formula (II). Compared with the prior art, the molecule provided by the invention combines the bridged tripolyindole and pyrene, on one hand, the bridged tripolyindole and pyrene have rigid conjugate planes, and non-radiative transition of the molecule caused by rotation or vibration can be inhibited; on the other hand, large intramolecular steric hindrance between the bridged tripolyindole and pyrene is easy to form a distorted molecular structure, and fluorescence quenching caused by intermolecular aggregation is reduced, so that blue fluorescence emission with high fluorescence quantum yield is obtained; in addition, the molecules also have better solubility and are suitable for vacuum evaporation, solution processing and ink-jet printing, so that organic electroluminescent devices prepared based on the molecules can realize efficient and stable blue light emission, and the molecules have development potential and broad prospects in the field of organic electronic display.

The invention discloses a phosphorescent iridium complex, a luminescent layer, an organic electroluminescent device and electronic equipment, and belongs to the field of organic electroluminescence, the phosphorescent iridium complex has a rigid indolocarbazole structure, obviously inhibits the vibration of a main ligand, prevents the vibration emission of the ligand structure from being coupled to an electron transition process, and reduces the vibration transition intensity. Besides, by reasonably regulating and controlling the energy level structure of the iridium complex, phosphorescence generated by the iridium complex is mainly emitted in an LC state, contribution of an MLCT emission state is relatively small, different from that of a traditional iridium complex based on the LC emission state, non-radiative transition of the complex can be inhibited to a great extent due to introduction of a rigid structure, and the stability of the iridium complex is improved. The luminescence capability of the iridium complex is enhanced. Meanwhile, in combination with the hole transport capacity of the indolocarbazole derivative and the electron transport capacity of the pyridine derivative, the iridium complex also has excellent bipolar transport performance.

The invention relates to an organic long afterglow material containing triphenylphosphine (triphenylphosphine oxide). The molecular structure of the organic long afterglow material is TP(O)-R, whereinTP(O) is a triphenylphosphine (triphenylphosphine oxide) group; R is an aromatic ring or an aromatic heterocyclic compound; TP(O) and R groups are connected in an ortho-position mode, the synthesizedluminescent material has a spiral molecular configuration, non-radiative transition is effectively inhibited under the large steric hindrance configuration and strong intramolecular action, long afterglow luminescence is achieved, and the luminescence wavelength, phosphorescence lifetime and other properties of a final product can be adjusted by introducing different functional groups. The synthesis method disclosed by the invention is simple in process and easy to purify, the synthesized luminescent material has the spiral molecular configuration, the non-radiative transition is effectivelyinhibited under the large steric hindrance configuration and strong intramolecular action, the long afterglow luminescence is realized, and the luminescence wavelength, phosphorescence lifetime and other properties of the final product can be adjusted by introducing different functional groups. The organic long afterglow material is applied to the fields of organic photoelectricity, biological imaging, counterfeiting prevention and the like.

The invention relates to the technical field of organic light-emitting materials, and provides a quinoline unit structure-based 5/6/6 parallel-ring tetradentate cyclometalated platinum (II) complex phosphorescent material with a general formula as shown in the specification. Compared with a bidentate ligand platinum (II) complex, the tetradentate ligand-based cyclometalated platinum (II) complex provided by the invention has strong molecular rigidity, can effectively inhibit non-radiative transition caused by molecular vibration, is beneficial to improvement of quantum efficiency, and has wide application prospects in various fields such as OLED display and illumination.

The invention belongs to the technical field of organic electroluminescent materials, and particularly discloses a blue thermal activity delayed fluorescent material based on a dibenzoheterocycle conjugated pi bridge, and application thereof. The blue thermal activity delayed fluorescent material is a novel blue light TADF material which takes an arylamine derivative as a donor unit, sulfone as an acceptor unit and dibenzoheterocycle as a conjugated pi bridge. The dibenzoheterocycle conjugated pi bridge has a relatively large planar rigid structure, is beneficial to inhibition of non-radiative transition of molecules and improvement of the luminous efficiency of the TADF material, can also obtain a relatively small delta EST value, and is beneficial to construction of an efficient blue TADF material. The novel blue light TADF material is used as a luminescent layer dopant to prepare a solution processing type electroluminescent device, and the maximum external quantum efficiency of more than 20% is obtained. The relationship between the molecular structure and the performance is discussed in detail, and has important significance for constructing an efficient blue-light TADF material.