37results about How to "Reduce annihilation" patented technology

The invention discloses a fused ring compound, a preparation method and applications thereof. The fused ring compound has a structure represented by a formula (I) or a formula (II). According to the invention, the main body part of the compound serves as a large electron donor center and is well paired with an electron withdrawing group, so that electrons and holes are transmitted in a balanced manner, and effective combination of the electrons and the holes is promoted; the transmission capability of carriers is moderate, so that disappearing caused by over-high carrier concentration is avoided; hOMO and LUMO energy levels are matched with adjacent materials, and the driving voltage is small, so that the service life is remarkably prolonged; and the fused ring compound has good thermal stability and an appropriate sublimation temperature, and can avoid the thermal decomposition of a material in a film forming or using process, avoid the function loss of a material layer, and improve the luminous efficiency and the luminous performance of a device. The invention further provides a preparation method of the fused ring compound, an organic electroluminescent device and applications of the organic electroluminescent device in a lighting device or a display device.

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 present invention provides an axene compound, its preparation method and application, including the compound with the structure shown in formula I. The axene compound provided by the present invention has a non-planar structure (three-dimensional structure), and there is no stacking between molecules, which can reduce the annihilation generated by high-energy excitons, promote the anode to inject holes into the hole transport layer, avoid the generation of Joule heat, avoid The stacking and crystallization of the molecules in the hole transport layer can further improve the service life of the device; the axenene compound provided by the invention has good thermal stability and good film-forming property, which is also beneficial to improving the service life of the device.

The invention provides an organic compound and its preparation method and application. The organic compound has a structure shown in formula I. The organic compound has a high thermal decomposition temperature, a high triplet energy level, and a relatively small energy level difference between HOMO and LUMO. The HOMO and LUMO energy levels of small, specific-structured compounds match the hole-transport layer and the electron-transport layer. At the same time, the specific three-dimensional configuration prevents molecular stacking of material molecules, which reduces the annihilation due to the existence of high-energy excitons and improves Energy transfer efficiency, improve luminous efficiency, reduce driving voltage, have high luminous stability, effectively reduce color shift, and high thermal decomposition temperature, have high thermal stability, improve luminous efficiency and luminous performance of the device.

The invention discloses a green organic electroluminescent device, which comprises a substrate, and a first electrode layer, a light-emitting layer and a second electrode layer sequentially formed on the substrate, the light-emitting layer includes a host material and a green phosphorescent dye, The host material is a thermally activated delayed fluorescent material and a hole-type transport material doped or not doped with a hole-type transport material, and the mass ratio of the thermally activated delayed fluorescent material to the hole-type transport material is (0.1-100 %): (99.9-0%), the doping ratio of the green phosphorescent dye in the light-emitting layer is 0.5-10wt%. The present invention uses energy transfer to reduce triplet-triplet annihilation (TTA), improve exciton utilization, and then improve device efficiency and life; ΔE of the present invention ST Small (<0.3eV), this type of electron acceptor has good stability, and the torsion angle between the acceptor and the donor is small, the radiative transition rate is high, and the singlet S of thermally activated delayed fluorescent material (TADF) 1 than the common host singlet S 1 Low, effectively reducing the device drive voltage.

A blue-light thermally excited delayed fluorescent aromatic material containing carbazole dendrites and a preparation method and application thereof for a warm white light device, which relate to a thermally excited delayed fluorescent material, a preparation method and an application. The purpose of the present invention is to solve the problems of poor uniformity of existing TADF blue light guest materials, low color purity and low efficiency of blue light. The structural formula of the thermally excited delayed fluorescent aromatic material containing carbazole dendrons is The blue-light heat-excited delayed fluorescent aromatic material containing carbazole branch is prepared from nitrogen-containing heterocyclic compound branch and dibromodifluorobenzene. The thermally excited delayed fluorescent aromatic material containing carbazole dendrites is used as a host luminescent material or a guest luminescent material in a thermally excited delayed fluorescent electroluminescence device, and as a host luminescent material in a phosphorescent device or a warm white light device. The invention can obtain the blue light thermal excitation delay fluorescent aromatic material containing carbazole dendrites and the preparation method of the devices thereof.

The invention belongs to the field of photoelectric devices, and discloses a hemispherical shell organic electroluminescence device with two luminescent layers and a preparation method for the device. The hemispherical shell organic electroluminescence device with the two luminescent layers comprises a hemispherical shell base, wherein an anode layer, a p-type doped hole transport layer, an electron blocking layer, a blue luminescent layer, a green luminescent layer, a hole blocking layer, an n-type doped electron transport layer and a cathode layer are stacked on the internal surface of the hemispherical shell base in sequence. The hemispherical shell organic electroluminescence device is provided with the two luminescent layers with a subject and object doped structure, and a subject material is a bipolar subject material or a mixed material of hole transport and electron transport subject materials, so that the impact recombination zone of excitons can be expanded, triplet-triplet annihilation is avoided, and the starting voltage of the organic electroluminescence device is reduced.

The invention provides a substituted tricarbonyl 2, 2', 4, 2'- terpyridyl rhenium (I) coordination compound, a preparation method and functions thereof. The preparation method for the rhenium (I) coordination compound includes steps of preparing a ligand and preparing the coordination compound. The rhenium (I) coordination compound has the advantages that triplet state annihilation is reduced, charge carrier transmission performance is improved, and an organic light-emitting device made of the provided rhenium (I) coordination compound can be simplified in structure and improved in performance. The rhenium (I) coordination compound is simple in synthesizing, quite high in yield, easy to purify and stable in property in the air.

The invention relates to a dye cell based on a three-layer TiO2 composite thin film, which comprises a photoanode, a counter electrode and an electrolyte, wherein the photoanode and the counter electrode are arranged oppositely, and the liquid electrolyte is sandwiched therebetween; the photoanode comprises an FTO conductive substrate; a TiO2 composite thin film is arranged on the surface of the FTO conductive substrate; the TiO2 composite thin film is arranged in a three-layer structure, and the photoanode FTO substrate is directed to the counter electrode direction; and the TiO2 composite thin film comprises a TiO2 underlayer composite thin film, a TiO2 interlayer composite thin film, and a TiO2 upper-layer composite thin film sequentially.