Small-molecule luminescent materials based on 1,3-benzodiazine (quinazoline) and production method and application of small-molecule luminescent materials based on 1,3-benzodiazine (quinazoline)

Abstract

The invention provides small-molecule luminescent materials based on 1,3-benzodiazine (quinazoline) and a production method and application of the small-molecule luminescent materials based on the 1,3-benzodiazine (quinazoline), and belongs to the technical field of organic photoelectric materials. A structural formula of the luminescent materials is shown in a formula (1)as shown in the description, in theformula (1), each of R1, R2, R3, R4, R5 and R6 is selected from one of a hydrogen atom, an alkoxy group, an alkylthio group, an alkylamine group, an arylamine group, an aryloxy group, an arylthio group, an aryl group and an aromatic heterocyclic group, and at least one of R1, R2, R3, R4, R5 and R6 is an aromatic heterocyclic group. According to the small-molecule luminescent materials based on the 1,3-benzodiazine (quinazoline) and the production method and application of the small-molecule luminescent materials based on the 1,3-benzodiazine (quinazoline), the 1,3-benzodiazine (quinazoline) is introduced into TADF materials for the first time, and high luminescence efficiency is achieved. The materials are simple to synthesize, steps are short, and synthesis cycles are short. Reaction yields are high, and the yields of all the steps are higher than 70%, so that the cost is saved. The OLED luminescent efficiency is high, and the highest efficiency can exceed 20%.

Description

technical field [0001] The invention belongs to the technical field of organic photoelectric materials, and in particular relates to a 1,3-naphthyridine (quinazoline)-based small-molecule light-emitting material and its preparation and application. Background technique [0002] Since the ultrathin multilayer electroluminescent diodes were first reported by C.W.Tang et al. in 1987, organic light-emitting diodes (OLEDs) have received extensive attention in both academia and industry. In the past three decades, researchers have invested a lot of energy to improve the luminous efficiency of OLEDs. These studies mainly include the following two categories: first, the traditional fluorescence emission, that is, the use of singlet exciton radiative transition luminescence, However, since this type of emission can only achieve an internal quantum efficiency (IQE) of 25% at most, it cannot meet the actual needs; second, the spin-orbit coupling using the heavy metal effect makes the t...

AI Technical Summary

Problems solved by technology

However, compared with N-hetero six-membered rings, there are very few reports on the use of a series of heterocyclic compounds such as benzodiazetidine as acceptors in TADF materials, especially 1,3-di-N-heterocyclic compounds. Naphthalene (quinazoline), which has important applications in biology and sensing, but it is rarely reported as a light-emitting material applied to OLEDs and the efficiency is less than 5%. As for the application in TADF materials, there is no report yet

Images