Organic electroluminescent diodes (OLEDs) have great potential in the field of display and illumination, and have drawn much attention from academia and industry. Luminescent materials are the core of OLEDs. Currently, devices based on platinum and heavy metal complexes Efficiency and stability have reached the practical requirements, but the development of stable and efficient blue light materials device is progressing slowly, becoming a bottleneck in the development of the OLED industry.In recent years, the organic small molecule heat-activated delayed fluorescence (TADF) material to be the most promising here A breakthrough made a class of organic electroluminescent materials.
Recently, a group of highly efficient TADF blue materials, B-oCz and B-oTC, have been designed and synthesized by Lu Canzhong, Key Laboratory of Functional Nanostructure Design and Assembly, Institute of Material Structure, Chinese Academy of Sciences. Through rational molecular design, The lowest single-triplet energy gap (DEST) and larger radiation transition rate.At the same time, the molecular non-radiative transition is effectively inhibited.B-oTC has a small concentration quenching effect in the thin film, the pure The photoluminescence efficiency of the film is as high as 94%, and the external quantum efficiency of non-doped blue OLED prepared by solution processing method is 19.1% .Related research results are published in "Applied Chemistry of Germany".
Previously, the research team made a series of progresses in the design and synthesis, luminescent mechanism and device performance research of monovalent copper and silver complex luminescent materials.The research work has been supported by the National Natural Science Foundation of China and key deployment projects of Chinese Academy of Sciences .
