[13p-N205-1~13] 12.4 Organic light-emitting devices and organic transistors

▼ [13p-N205-13] High-efficiency and low-driving voltage solution-processed orange-red OLEDs based on dibenzo[a,c]phenazine-based TADF emitters

〇Dehao Jiang¹, Hisahiro Sasabe^1,2,3, Hiroki Arai¹, Kohei Nakao¹, Kengo Kumada¹, Junji Kido^1,2,3 (1.Yamagata Univ., 2.ROEL, 3.FROM)

Keywords:TADF Materials, Orange-red, Solution-process

Thermally activated delayed fluorescent (TADF) emitters have attracted much attention for the superior ability to achieve 100% internal quantum efficiency on low-cost organic light-emitting devices (OLEDs). Among visible color region, the development of orange-red TADF OLEDs is far behind blue and green TADF OLEDs, especially in solution-processed devices. In this work, we developed two orange-red TADF emitters based on dibenzo[a,c]phenazine (DBP) named 2DMAC-DBP-2tBuCz and 2SPAC-DBP-2tBuCz. By using a polymer HTL and co-host system, 2SPAC-DBP-2tBuCz-based OLEDs achieves an EQE of 23.7% with a low Von of 2.3V, which is the best performance among reported solution-processed orange-red TADF OLEDs. We will discuss the influence of molecular structure on photophysical properties here.