[25p-1BC-1~11] 12.2 Characterization and Materials Physics

2:00 PM - 2:15 PM JST(5:00 AM - 5:15 AM UTC)

[25p-1BC-3] Comprehensive kinetic analysis of TADF materials showing peculiar thermal behavior

〇Youichi Tsuchiya¹, Keito Mizukoshi^1,2, Masaki Saigo³, Tomohito Ryu³, Kiyoshi Miyata³, Ken Onda³, Chihaya Adachi^1,2 (1.OPERA Kyushu Univ., 2.Eng. Kyushu Univ., 3.Sci. Kyushu Univ.)

Keywords:

thermally activated delayed fluorescence,kinetic analysis,nominal energy gap

We found TMCz-BO, a TADF material, showed longer and shorter delayed emission decay lifetime at higher and lower temperature in toluene, respectively, and it provided a negative ΔE_ST on three-state kinetic analysis as like inverted S₁-T₁ material. The detail analysis of temperature dependence of emission decay in valious solvents revealed that it could be explained with the conventional TADF energy arrangement by comprehensive kinetic analysis considering the higher lying triplet state and temperature dependence of the activation energy.