Preparation method of ultra-low turn-on voltage deep blue light organic electroluminescent device

• Main Authors: YIN SHOUGEN, CUI MINGKUAN, RUI HONGSONG, LU KUANKUAN, WU XIAOMING, JIN MENGJIA, LAN BAOFA, LIU XUGUANG, YANG NAN, HOU HUIQING
• Format: Patent
• Language: Chinese; English
• Published: 17.12.2021
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; SEMICONDUCTOR DEVICES

The invention relates to a preparation method of an ultra-low turn-on voltage deep blue light organic electroluminescent device. According to the invention, a methyl group, a phenyl group and a trimethylphenyl group are introduced to boron atoms on two sides of a BN-Ullazine derivative main body, and a benzyl group is introduced to a nitrogen atom; the material has a relatively wide optical band gap and a relatively high triplet state energy level; the triphenylamine polymer PTAA has the characteristics of high hole mobility, wide forbidden band structure, high fluorescence quantum yield and the like; the mixed light-emitting layer in the device is BN-Ullazine doped PTAA; a fluorescence up-conversion mechanism formed by a triplet-triplet annihilation (TTA) effect of a main body material BN-Ullazine derivative greatly improves the utilization rate of singlet excitons; the BN-Ullazinederivative is matched with the energy level structure of PTAA and has good energy transfer, so that singlet excitons generated by