Synthesis and Luminescence Property of Pyrene Derivatives Including Diphenyl-Imidazole Moiety

Abstract

We have designed and synthesized blue emitting compounds, DBF-PI and DBT-PI, by incorporating pyrene and imidazole groups as main chromophore and introducing dibenzofuran and dibenzothiophene groups. Pyrene and diphenyl-imidazole were used to synthesize blue emitters of 1-(4-Dibenzofuran-4-yl-phenyl)-4,5-diphenyl-2-pyren-1-yl-1H-imidazole (DBF-PI) and 1-(4-Dibenzothiophen-4-yl-phenyl)-4,5-diphenyl-2-pyren-1-yl-1H-imidazole (DBT-PI). The optical and electroluminescence properties of newly synthesized materials were measured. Both materials emit blue photoluminescence in the film state and DBF-PI have a high PLQY value of about 80% in solution state. The synthesized materials were applied as EML in non-doped devices, and high efficiency of 2.92 cd/A and EQE of 2.07% in DBF-PI device were achieved.

Keywords:

• Pyrene emitters
• OLEDs
• imidazole

Acknowledgement

This research was supported by National R&D Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Science & ICT (No. 2017M3A7B4041699). This research was supported by a grant from the Fundamental R&D Program for Core Technology of Materials funded by the Ministry of Trade, Industry and Energy, Republic of Korea (Project No. 10080565). This research was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education (No. 2017R1D1A1A09082138).