49results about How to "Widen the compound area" patented technology

The invention discloses a fused ring compound comprising a structure shown as a formula (I) or (II). According to the fused ring compound, by controlling effective conjugation of aromatic rings and heterocyclic rings, the electron transport performance is balanced while the hole performance is improved. The compound has high triplet state energy level and glass transition temperature, is difficultin crystallization of material molecules, and is capable of ensuring high-efficiency transfer of energy to a guest material while serving as a host material of a luminous layer. The substituent groupof the fused ring compound is adjusted, the electron and hole transport performances are further improved, the singlet state and triplet state energy level difference is reduced, the compound area ofthe carrier is widened, and triplet state exciton annihilation is avoided. The invention further discloses an organic electroluminescence device. At least one functional layer contains the fused ringcompound, and the fused ring compound serves as the host material of the luminous layer and is matched with the energy level of an adjacent carrier transport layer. The luminous efficiency of the device is improved, and the driving voltage of the device is reduced.

The invention provides an organic electroluminescent device and a display device. The organic light-emitting device comprises a first light-emitting layer and a second light-emitting layer, wherein the material of the first light-emitting layer comprises a first main body material, a first sensitizer and a first dye, and the material of the second light-emitting layer comprises a second main bodymaterial, a third main body material, a second sensitizer and a second dye; the first main body material can form an exciplex with the second main body material or the third main body material, and the second main body material can form an exciplex with the third main body material; the first sensitizer and the second sensitizer are both thermally activated delayed fluorescent materials; the firstdye and the second dye are both resonance type thermal activation delayed fluorescence materials. According to the light-emitting layer of the organic light-emitting device provided by the invention,the interface exciplex and the bulk phase exciplex are used as main body materials, and the TADF material is used as a sensitizer to sensitize the resonant TADF material, so that the efficiency roll-off is remarkably reduced, and the device efficiency and stability are remarkably improved.

The invention discloses a fused ring compound. The fused ring compound has the structure as shown in a formula (I) or a formula (II). The fused ring compound is favorable for balancing electronic transmission property while improving the cavitation performance by controlling effective conjugation of an aromatic ring and a heterocyclic ring; and the compound has high three linear energy level and vitreous transition temperature, the material molecules are not liable to crystallization, and the compound serving as a main body material of a light-emitting layer can guarantee that the energy is efficiently transmitted to an object material. The substituent group of the fusing ring compound is adjusted, so that the transmission performance of electrons and cavities is further improved, single linear and three linear energy level difference is reduced, the composite area of a current carrier is widened and three linear exciton annihilation is avoided. The invention also discloses an organicelectroluminescence device; at least one functional layer comprises the fused ring compound; the fused ring compound serves as the main body material of the light-emitting layer and is matched with the energy level of the adjacent current carrier transmission layer; and the driving voltage of the device is reduced while the light-emitting efficiency of the device is improved.

The invention discloses a dibenzo-heterocyclic compound, which has a structure represented by the formula (I). The LUMO energy level of the dibenzo-heterocyclic compound is low, the dibenzo-heterocyclic compound can be well matched with an electron transport material, and the electron injection and transportation are promoted. The dibenzo-heterocyclic compound has a good hole transport performance, is capable of balancing the ratio of electrons / holes in a luminous layer when being used as a luminous layer material, increases the compounding probability, and improves the luminous efficiency. Due to the spatial configuration of the dibenzo-heterocyclic compound, molecule stacking is avoided, the generation of high energy exciton generated by energy transmission between molecules is prevented, annihilation of exciton is inhibited, and the roll-off is inhibited. At the same time, the dibenzo-heterocyclic compound has good thermal stability and is capable of efficiently and stably emittingblue light. The invention also discloses an organic electroluminescent device, at least one functional layer of the device comprises the dibenzo-heterocyclic compound, and the blue light device has the advantages of high blue light luminous efficiency and low work voltage.

The invention relates to the field of display technologies, in particular to a condensed polycyclic compound, a preparation method and application thereof. The condensed polycyclic compound provided by the invention has a structure shown as formula (I). The compound structure has double dipolarity, the HOMO energy level and LUMO energy level of a main material can be located on different electron-donating groups and electron-withdrawing groups, so that the charge and hole transport balance in the main material is good, thus enlarging the area of hole and electron recombination in a luminescentlayer, lowering the exciton concentration, and improving the device efficiency. The invention also provides an organic electroluminescent device. At least one functional layer of the organic electroluminescent device contains the condensed polycyclic compound. And use of the compound as the main material of the luminescent layer can reduce the working voltage of OLED devices and improve the current efficiency.

The invention relates to a novel iridium complex with a nitrogen heterocyclic ring as the main ligand and a dithioaromatic / aromatic heterocyclic phosphoric acid compound as an auxiliary ligand. The nitrogen heterocycle and phosphorus-sulfur group in the iridium complex molecule help to improve the electron mobility of the material and regulate the luminous color, thereby balancing the injection and transport of holes and electrons, broadening the recombination area of ​​carriers, and improving device efficiency. , reducing efficiency roll-off. The iridium complex of the invention has the advantages of simple synthesis, stable chemical properties, easy sublimation and purification, and excellent device performance, which provides convenience for obtaining high-efficiency organic electroluminescent devices and their applications in the fields of lighting and display.

The invention discloses a deep-ultraviolet AlGaN-based light-emitting diode with a coupled quantum well structure, which at least includes: an n-type semiconductor layer, a multi-quantum well structure formed by periodically overlapping a potential barrier layer and a coupled AlGaN well layer, and a p-type semiconductor layer. It is characterized in that: the coupling AlGaN well layer includes at least a three-layer structure, which is Al from bottom to top x Ga 1‑x N well layer, Al y Ga 1‑y N barrier layer, and Al x Ga 1‑x N well layer. By using the coupled well layer structure design, the TE / TM mode spontaneous emission recombination rate of the c-plane LED is enhanced, the internal quantum efficiency of the LED device is improved, and the efficiency drop effect of the nitride LED device is suppressed, thereby improving the optics of the deep ultraviolet nitride light-emitting diode performance.

The invention discloses an organic light-emitting device and a display panel. The organic light-emitting device includes a first electrode, a second electrode disposed opposite to the first electrode, and a light-emitting layer disposed between the first electrode and the second electrode, and the light-emitting layer includes a host material, a light-emitting guest, and Auxiliary guest, the luminescent guest includes a fluorescent dye, and the auxiliary guest includes an organic substance with heat-activated delayed fluorescence characteristics. The auxiliary guest with TADF characteristics makes the maximum external quantum efficiency of the fluorescent light-emitting device equivalent to that of the phosphorescent light-emitting device, realizes that the luminous efficiency of the fluorescent light-emitting device is equivalent to that of the phosphorescent light-emitting device, and improves the luminous efficiency of the fluorescent light-emitting device; Phosphorescent materials and fluorescent dyes do not contain precious metals and are cheap, which greatly reduces the cost of organic light-emitting devices.

In the organic electroluminescent device described in the present invention, the first light-emitting layer is a single hole-type host material doped guest dye layer, and the second light-emitting layer is an electron-type host material doped guest dye layer; since the first light-emitting layer and the second light-emitting layer The carrier transport characteristics of the host materials in the two light-emitting layers are different, so that the final electrons and holes recombine between the interface of the first light-emitting layer and the second light-emitting layer to form excitons and emit light, so that the position of the light-emitting center can be adjusted. Therefore, the adjustment of the viewing angle of the organic light-emitting display device is realized. Although the final recombination center of electrons and holes is located at the interface between the first light-emitting layer and the second light-emitting layer, the second light-emitting layer also satisfies the recombination conditions of electrons and holes, so that the recombination region extends into the second light-emitting layer, which is The width of the recombination region of electrons and holes is increased, effectively prolonging the service life of the organic electroluminescence device.

The invention provides a nitrogen heterocyclic compound and its preparation method, an organic electroluminescence material containing it, a light-emitting layer and applications, including a compound having the structure shown in formula I. When the nitrogen heterocyclic compound provided by the invention is used as a host material, it has high luminous efficiency, and when used in an OLED device, it is beneficial to improve the overall performance of the device.

The invention protects an imidazole substituted spirofluorene compound and its application, and discloses a compound of the following general formula: X 1 ~X 4 from CR 4 or N,R 4 Selected from hydrogen, C1-C10 alkyl, substituted or unsubstituted C6-C15 aryl, substituted or unsubstituted C3-C15 heteroaryl; R 1 ~R 3 Selected from hydrogen, C1-C10 alkyl, substituted or unsubstituted C6-C15 aryl, substituted or unsubstituted C3-C15 heteroaryl; R 1 ~R 3 Each independently fused with the connected benzene ring to form a C9-C30 aryl or heteroaryl; m, n are integers of 0-4, p is an integer of 0-3; L 1 , L 2 Selected from single bond, substituted or unsubstituted C6-C30 arylene, substituted or unsubstituted C3-C30 heteroarylene; Ar 1 , Ar 2 Selected from hydrogen, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C3-C30 heteroaryl. The compounds of the present invention exhibit excellent device performance and stability when used as light-emitting materials in OLED devices or as electron transport materials. The present invention also protects the organic electroluminescent device using the compound of the above general formula.

The invention relates to a novel iridium complex with a nitrogen heterocycle as the main ligand and a thioaromatic / aromatic heterocyclic phosphoric acid compound as an auxiliary ligand. The nitrogen heterocycle and phosphorus-sulfur group in the iridium complex molecule help to improve the electron mobility of the material and regulate the luminous color, thereby balancing the injection and transport of holes and electrons, broadening the recombination area of ​​carriers, and improving device efficiency. , reducing efficiency roll-off. The iridium complex of the invention has the advantages of simple synthesis, stable chemical properties, easy sublimation and purification, and excellent device performance, which provides convenience for obtaining high-efficiency organic electroluminescent devices and their applications in the fields of lighting and display.