37results about How to "Reduce annihilation" patented technology

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 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.

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.