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제125회 대한화학회 학술발표회 및 총회 High efficiency green TADF emitters of acridine donor and triazine acceptor D–A–D structures

2020년 2월 3일 13시 29분 05초
ORGN.P-499 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
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Organic Chemistry
저자 및
Kyu Yun Chai*, Younghee Park, Subin Oh*, Keunhwa Kim*, Han-Su Hwang1,*, Kanthasamy Raagulan*
Department of Chemistry, Wonkwang University, Korea
1Chemistry, Wonkwang University, Korea
Two thermally activated delayed fluorescence (TADF) emitters with high synthetic yields were designed and synthesized. Both emitters, 10,100-(5-(4,6-diphenyl-1,3,5-triazin-2-yl)-1,3-phenylene)bis(9,9-dimethyl- 9,10-dihydroacridine) (TRZ-DDMAc) and 10,100-(5-(4,6-diphenyl-1,3,5-triazin-2-yl)-1,3-phenylene)bis(9,9-diphenyl-9,10-dihydroacridine) (TRZ-DDPAc), showed excellent photophysical properties. Interestingly, both of the materials had a small energy difference between singlet and triplet levels, which confirmed that donor–acceptor based molecular design brought effective reverse intersystem crossing (RISC) to enable the TADF mechanism. The TADF characteristic was confirmed by a delay time of 10.32 and 10.37 ms for TRZ-DDMAc and TRZ-DDPAc, respectively. TRZ-DDPAc revealed a photoluminescencequantum yield of 79.7% in a doped film state. Moreover, several green OLED devices were fabricated by using different host materials along with various doping concentrations to ensure the optimal performance of each TADF material. The device with TRZ-DDPAc as an emitter (30%: DBFPO) exhibited excellent current and maximum external quantum efficiencies of 62.8 cd A1 and 27.3%, respectively. Green colour emission was observed from all devices, which originated through the TADF mechanism.