[13a-B11-1~10] 12.4 Organic light-emitting devices and organic transistors

△ [13a-B11-8] High efficiency thermally activated delayed fluorescent emitters containing terpyridine and acridine moieties

〇(M1)Yuya Hayasaka¹, Hisahiro Sasabe^1,2, Ryutaro Komatsu¹, Kohei Nakao¹, Junji Kido^1,2 (1.Yamagata Univ., 2.Yamagata Univ ROEL)

Keywords:Organic light-emitting device, Thermally activated delayed fluorescence

A series of thermally activated delayed fluorescence emitters named AcR-2TP derivatives containing terpyridine derivatives and acridine moieties were designed and synthesized. The PLQY of AcR-2TP derivative doped DPEPO and CBP films were evaluated to be 50-70%. The TADF character is confirmed by the means of the transient PL decay curve at a high temperature of 300 K. The delayed PL intensities of the three materials increase at 300 K, which indicates the presence of TADF. The delayed PL intensities of the three materials increase at 300 K, which indicates the presence of TADF. A green AcR-2TP emitter exhibits almost comparable performances to those in green phosphorescent counterparts realizing an external quantum efficiency of over 23%, a power efficiency of nearly 80 lm W^-1 with an exceptionally low efficiency roll-off. This is the first example of highly luminescent terpyridine-based TADF emitters so far.