【Abstract】
Low–Driving–Voltage Light Blue Thermally Activated Delayed Fluorescent OLEDs with High External Quantum Efficiency of nearly 25%
Ryutaro Komatsu1, Hisahiro Sasabe＊1, 2, Yuki Seino1, Kohei Nakao1, Yong-Jin Pu1, 2, Junji Kido＊1, 2
Novel light blue thermally activated delayed fluoresce (TADF)1 emitter LBT1 is developed. A LBT1–based light blue organic light–emitting device (OLED) with a structure of [ITO/ di-[4-(N,N-ditolyl-amino)-phenyl] cyclohexane (TAPC) (30 nm)/ 10 wt% LBT1-doped N,N-dicarbazoyl-3,5-benzene (mCP) (10 nm)/ 10 wt% LBT1-doped bis[2-(diphenylphosphino) phenyl]ether oxide (DPEPO) (10 nm) /3,3’’,5,5’-tetra(3-pyridyl)-1,1’;3’,1’’-terphenyl (B3PyPB) (50 nm)/ LiF (0.5 nm)/Al (100 nm)] was fabricated. This device realized a maximum external efficiency (hext,max) of 24.5 %, a turn–on voltage at 1 cd m–2 (Von) of 2.80 V, and a maximum power efficiency (hp,max) of 61.6 lm W-1 with Commission Internationale de L’Eclairage (CIE) chromaticity coordinates of (0.19, 0.37), which are the highest values comparable to those of blue TADF devices ever reported2–3.
Ryutaro Komatsu1, Hisahiro Sasabe＊1, 2, Yuki Seino1, Kohei Nakao1, Yong-Jin Pu1, 2, Junji Kido＊1, 2
Novel light blue thermally activated delayed fluoresce (TADF)1 emitter LBT1 is developed. A LBT1–based light blue organic light–emitting device (OLED) with a structure of [ITO/ di-[4-(N,N-ditolyl-amino)-phenyl] cyclohexane (TAPC) (30 nm)/ 10 wt% LBT1-doped N,N-dicarbazoyl-3,5-benzene (mCP) (10 nm)/ 10 wt% LBT1-doped bis[2-(diphenylphosphino) phenyl]ether oxide (DPEPO) (10 nm) /3,3’’,5,5’-tetra(3-pyridyl)-1,1’;3’,1’’-terphenyl (B3PyPB) (50 nm)/ LiF (0.5 nm)/Al (100 nm)] was fabricated. This device realized a maximum external efficiency (hext,max) of 24.5 %, a turn–on voltage at 1 cd m–2 (Von) of 2.80 V, and a maximum power efficiency (hp,max) of 61.6 lm W-1 with Commission Internationale de L’Eclairage (CIE) chromaticity coordinates of (0.19, 0.37), which are the highest values comparable to those of blue TADF devices ever reported2–3.
【Related Site】 A-COE at Peking Univ.
【Photograph】
（Presentation Ceremony）
(Gold Award)
