[14p-302-1~17] 12.4 Organic light-emitting devices and organic transistors

△ [14p-302-8] Effective Manipulation of the Electronic Excited State Energies of Pyrimidine-BasedTADF Emitters for Efficient Deep-Blue OLEDs

〇Tatsuya Ohsawa¹, Ryutaro Komatsu², Hisahiro Sasabe^1,2,3, Kohei Nakao², Yuya Hayasaka², junji Kido^1,2,3 (1.Fac. of Engineering, Yamagata Univ., 2.Dept. of Org. Mater. Sci., Yamagaya Univ., 3.ROEL)

Keywords:OLED, TADF, deep blue

A series of pyrimidine-based deep blue TADF emitters called Ac–XMHPM (X=1,2, and 3) are developed. Ac–XMHPM-based organic light-emitting devices (OLEDs) were fabricated. Among them, the Ac–3MHPM-based device exhibited deep-blue emission with Commission Internationale de l’Eclairage chromaticity coordinates (CIE) of (0.16, 0.15), a low turn-on voltage of 3.25 V, very high external quantum efficiency (EQE) of 18%, and a high power efficiency of 20 lm W^–1, which are the highest values comparable to those of blue TADF-OLEDs ever reported.