【摘 要】
：
Achieving high-efficiency deep blue emitter with CIEy ＜ 0.06 (CIE,Commission Internationale de L\'Eclairage) and external quantum efficiency (EQE) ＞10％ has been a long-standing challenge for tradi-tional fluorescent materials in organic light-emitting d
【机 构】
：
Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 43
论文部分内容阅读
Achieving high-efficiency deep blue emitter with CIEy ＜ 0.06 (CIE,Commission Internationale de L\'Eclairage) and external quantum efficiency (EQE) ＞10％ has been a long-standing challenge for tradi-tional fluorescent materials in organic light-emitting diodes (OLEDs).Here,we report the rational design and synthesis of two new deep blue luminogens:4-(10-(4\'-(9H-carbazol-9-yl)-2,5-dimethyl-[1,1\'-biphe nyl]-4-yl)anthracen-9-yl)benzonitrile (2M-ph-ppCzAnBzt) and 4-(10-(4-(9H-carbazol-9-yl)-2,5-dimethyl phenyl)anthracen-9-yl)benzonitrile (2M-pCzAnBzt).In particular,2M-ph-pCzAnBzt produces saturated deep blue emissions in a non-doped electroluminescent device with an exceptionally high EQE of 10.44％ and C1Fxy (0.151,0.057).The unprecedented electroluminescent efficiency is attributed to the combined effects of higher-order reversed intersystem crossing and triplet-triplet up-conversion,which are supported by analysis of theoretical calculation,triplet sensitization experiments,as well as nanosec-ond transient absorption spectroscopy.This research offers a new approach to resolve the shortage of high efficiency deep blue fluorescent emitters.
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