53results about How to "Improve exciton utilization" patented technology

The invention discloses an organic electroluminescent device. A light-emitting layer comprises a host material and a guest material. The host material is an exciplex formed by an electron donor material and an electron acceptor material, and the guest material is a thermally activated delayed fluorescent material. The singlet-state energy level of the host material is lower than the singlet-stateenergy level of the guest material. Since the singlet-state energy level of the exciplex as the host material in the light-emitting layer is lower than the singlet-state energy level of the thermallyactivated delayed fluorescent material, the generation of high-energy excitons is prevented, and molecular bond breakage due to high excitation energy is effectively suppressed. The singlet-state energy level of the exciplex is low, which is beneficial to reduce the excitation energy of the excitons in the device, and suppress the triplet state-triplet state annihilation, the triplet state-polaronquenching and the singlet state-triplet annihilation phenomena in the device, thereby reducing the efficiency roll-off of the device and prolonging the service life of the device.

The invention discloses a compound based on xanthone and application thereof. The compound uses xanthone as a parent nucleus, which is connected to a heteroaromatic group, so as to destroy the molecular symmetry, and thus further destroy the crystallinity of molecules and avoid the aggregation between molecules. The compound based on xanthone has good film-forming property, and can be applied to organic light emitting diode as a luminescent layer; and the OLED device using the compound based on xanthone has good photoelectric property, and can meet the requirements of panel manufacturing enterprises.

The invention discloses an organic electroluminescent material with 9-fluorenone as a core and an application thereof. With the 9-fluorenone as the core, molecules of the compound are not liable to crystallize and aggregate and the compound has excellent film forming property. The compound is used on organic light emitting diodes as a luminescent layer material. The compound has excellent photoelectric performance and can satisfy application requirements of panel manufacturers better.

The invention discloses a compound based on disubstituted-9-fluorenone and application thereof. The compound takes disubstituted-9-fluorenone as a mother nucleus, and two sides of disubstituted-9-fluorenone are connected with two aromatic heterocyclic groups, so that the crystallization of molecules is destroyed, aggregation between the molecules is avoided, and excellent film forming property is achieved. When applied to an OLED as a luminescent layer material, the compound has favorable photoelectric property.

The invention discloses compounds taking xanthene as a core and an application of the compounds in organic electroluminescent devices. The compounds have proper molecular energy level, excellent thermal stability and film stability and are suitable for being applied to the field of organic electroluminescence as functional layers of the organic electroluminescent devices.

The invention discloses a compound with 9-fluorenone as a nucleus and application of the same to an OLED device. The compound uses 9-fluorenone as the nucleus and has the characteristics that molecules are not prone to crystallization and aggregation and the compound has good film forming ability. Applied as a luminescent layer material to an organic light-emitting diode, the compound has good photoelectric performance and can better adapt to and meet application requirements of panel manufacturers.

The invention discloses a compound with 9-fluorenone as a core and an application thereof. With the 9-fluorenone as the core, molecules of the compound are not liable to crystallize and aggregate and the compound has excellent film forming property. The compound is used on organic light emitting diodes as a luminescent layer material. The compound has excellent photoelectric performance and can satisfy application requirements of panel manufacturers better.

The invention discloses a boron-containing organic compound and a light-emitting device. The boron-containing organic compound comprises compounds as shown in any one of formulas (I)-(III), wherein R1-R14 are respectively selected from any one of the following groups: hydrogen, deuterium, halogen, cyano, NO2, N (R) 2, OR, SR, C(=O) R, P(=O) R, Si(R)3, substituted or unsubstituted C1-C20 alkyl group, C2-C20 alkenyl group, C2-C20 alkynyl group, C6-C40 aryl group and C5-C40 heteroaryl group; M is a substituted or unsubstituted C6-C48 aryl group; X1 and X2 are respectively selected from any one of the following groups: O, S, N-Y and C(Y)2; and Y is selected from any one of the following groups: a substituted or unsubstituted C1-C20 alkyl group, a substituted or unsubstituted C6-C40 aryl group or a substituted or unsubstituted C5-C40 heteroaryl group. The light-emitting device comprises a first electrode, a second electrode and an organic layer arranged between the first electrode and the second electrode, and the organic layer contains at least one boron-containing organic compound.

The invention belongs to the field of photoelectric materials, and discloses a non-aromatic amine small molecule photoelectric material and preparation and application thereof. The non-aromatic aminesmall molecule photovoltaic material has a structural formula as shown in the formula (I). In the formula, R1 is selected from H or -CH3; and R1, R2, R3, and R4 are independently selected from S or O.The non-aromatic amine small molecule photoelectric material of the invention has good hole transport ability, can be applied to a hole transport layer of an organic photoelectric device, and can also be combined with a common electron transport type material to generate an exciplex for luminescence, exhibits high fluorescence quantum yield and exhibits the property of thermally activated delayedfluorescence.

The invention relates to a compound with carbazole as a core, and a preparation method and an application thereof. The structure of the compound is characterized in that carbazole is connected with atriphenylamine structure through a carbon-nitrogen bond, and the carbon-nitrogen bond connection avoids exposure of an active position; carbazole is connected with a dibenzo five-membered ring througha carbon-carbon bond, so the chemical stability of the above material is improved; the whole molecule is of a large rigid structure, and has a high triplet state energy level (T1); the compound has alarge steric hindrance, and is not prone to rotate, and the three-dimensional space structure is stable, so the compound has a high glass transition temperature and a high molecular thermal stability; and HOMO and LUMO distribution positions of the compound are separated from each other, so the compound has appropriate HOMO and LUMO energy levels, thereby the compound can effectively improve theluminous efficiency and the service life of OLEDs when applied to the OLEDs.

The invention discloses a compound taking an anthrone skeleton as a core, and application thereof, and belongs to the technical field of semiconductors. The structure of the compound provided by the invention is represented by general formula (1) shown in the specification. The compound provided by the invention has relatively high triplet state energy level, relatively high glass transition temperature and relatively high molecular thermal stability; and when the material is used as a light-emitting layer or a hole blocking layer or an electron transport layer material of an OLED light-emitting device, the light-emitting efficiency of the device can be effectively improved, and the service life of the device can be effectively prolonged.

The invention discloses a nitrogen-containing seven-membered heterocyclic derivative compound, a preparation method thereof and an application of the compound to an organic light-emitting device, andbelongs to the technical field of semiconductors. The structure of the organic compound is as shown in a general formula as shown in the specification. The compound has higher glass transition temperature, molecular heat stability and Eg and suitable HOMO and LUMO energy level, a device structure is optimized, photoelectric property of the OLED (organic light emitting diode) can be effectively improved, and the service life of the OLED can be effectively prolonged.

The invention discloses a thiaxanthene dioxide type organic electroluminescence material and a preparation method and application thereof. A structural formula of the organic electroluminescence material is shown in the description. In the novel thiaxanthene dioxide type organic electroluminescence material, thiaxanthene dioxide is used as a mother nucleus to connect aromatic heterocyclic groups, molecular symmetry is destroyed, accordingly molecular crystallinity is destroyed, an intermolecular aggregation effect is avoided, the material has good film-forming property, most of molecules are rigid groups, and thus the heat stability of the material is improved. In addition, the thiaxanthene dioxide type organic electroluminescence material has a D-A structure, is more balanced in electron and hole distribution, has appropriate energy levels HOMO and LUMO, can effectively improve the exciton utilization ratio and high fluorescent radiation efficiency, reduce efficiency rolling-off under high current density and reduce device voltage, and the problem of efficiency rolling-off under high current density is solved.

The invention provides an organic light-emitting display device and a display device. A light-emitting layer of the display device comprises a compound shown in the chemical formula 1 and a compound shown in the chemical formula 2. The two compounds form an exciplex with a TADF mechanism, and the exciplex is used as a light-emitting layer main body material, so that the quantum efficiency of the light-emitting device can be improved.

The invention provides an organic compound and an organic light-emitting device, and belongs to the technical field of organic materials. The structure of the organic compound is shown as a formula I,and the organic compound can improve the performance of the organic light-emitting device.

The invention belongs to the technical field of display, and particularly discloses an organic light-emitting device. The organic light-emitting device comprises a light-emitting layer, the light-emitting layer comprises a main body material and a fluorescent doping material, the main body material employs a gathering induction delay fluorescent material, the molecule has a relatively large torsion angle under a gathering state, the distance among molecules is expanded, and the mutual effect among the molecules is reduced; meanwhile, excitons are mainly distributed on a molecule core under a simulation state of the gathering induction delay fluorescent material, triplet-triplet annihilation and triplet-polaron quenching of an excited state of main body molecules under a gathering state canbe effectively reduced, the efficiency roll-off of the device is reduced; and moreover, rotation-vibration of the gathering induction delay fluorescent material in the molecules under gathering is limited, the non-radiation relaxation energy loss of the main body in the device can be effectively reduced, so that the light-emitting efficiency of the device is improved.

The invention relates to an organic electroluminescent material and an organic electroluminescent device comprising the same, and belongs to the field of organic photoelectric materials. The molecularstructure of the organic electroluminescent material is shown as the following general molecular formula (I): (the formula is shown in the specification), where both Ar1 and Ar2 are aromatic substituent groups, and Ar1 and Ar2 may be the same or different. The organic electroluminescent material provided by the invention is applied at least in one functional layer of the organic electroluminescent device. The organic electroluminescent material has the characteristics of low possibilities of intermolecular crystallization and gathering, and good film formation; moreover, a rigid group in themolecule can improve the thermal stability of the luminescent material. The organic electroluminescent material is applied to the organic electroluminescent device, and the current efficiency, power efficiency and external quantum efficiency of the organic electroluminescent device are greatly improved; meanwhile, the organic electroluminescent material makes the distribution of electrons and holes in the luminescent layer being more balanced, and the organic electroluminescent material is very suitable as a luminescent host material.

The invention discloses a compound taking a heteroanthrone skeleton as a core, and application thereof, and belongs to the technical field of semiconductors. The structure of the compound provided by the invention is represented by general formula (1) shown in the specification. The compound provided by the invention contains a heteroanthrone mother nucleus and an aza fused ring branched chain structure, has relatively high glass transition temperature and molecular thermal stability, proper HOMO and LUMO energy levels, and relatively high Eg and triplet state energy level (T1). By means of device structure optimization, the photoelectric property of the OLED device can be effectively improved, and the service life of the OLED device can be effectively prolonged.

The invention discloses a diarylamine compound and an organic electroluminescent device containing the same, belonging to the technical field of semiconductor materials. The structure of the compound is shown as a general formula (1). The middle of the diarylamine compound is bridged by an aromatic ring, a fluorenyl group is connected to an amido group, and the diarylamine compound has excellent hole transport capacity, membrane phase stability and weather resistance. When a hole transport material of the organic electroluminescent device is formed by using the novel arylamine-based compound, effects such as improved device effect, reduced driving voltage, and prolonged lifetime can be obtained.