磷光
有机发光二极管
材料科学
准分子
光电子学
量子效率
电致发光
二极管
荧光
激子
光致发光
接受者
量子产额
兴奋剂
图层(电子)
纳米技术
光学
物理
量子力学
凝聚态物理
作者
Chun‐Jen Shih,Chih‐Chien Lee,Tzu‐Hung Yeh,Sajal Biring,Kiran Kishore Kesavan,Nurul Ridho Al Amin,Ming-Hung Chen,Wei-Chieh Tang,Shun‐Wei Liu,Ken‐Tsung Wong
标识
DOI:10.1021/acsami.8b08281
摘要
We report a new efficient exciplex-forming system consisting of a biscarbazole donor and a triazine-based acceptor. The new exciplex was characterized with a high photoluminescence quantum yield up to 68% and effective thermally activated delayed fluorescence behavior. The BCzPh:3P-T2T (2:1, 30 nm) blend was examined not only as an emitting layer (device D1) but also a reliable co-host of fluorescent and phosphorescent emitters for giving highly efficient exciplex-based organic light-emitting diodes (OLEDs) with a high maximum external quantum efficiency of 15.5 and 29.7% for devices doped with 1 wt % C545T (device D2) and 8 wt % Ir(ppy)2(acac) (device D4), respectively. More strikingly, a strongly enhanced lifetime (T75 = 16 927 min.) of the C545T-doped device was obtained. The transient electroluminescence measurement as well as capacitance–voltage and impedance–voltage correlations were utilized to explore the factors governing the high efficiency and stability. The obtained results clearly show that the energy transfer and charge transport is highly efficient; they also show the photoelectric semiconducting characteristics of exciplex-based OLEDs, which are significantly different from those of unipolar host-based reference devices D3 (Alq3: 1 wt % C545T) and D5 (CBP: 8 wt % Ir(ppy)2(acac)). Our works have established a systematic protocol to shed light on the mechanisms behind exciplex-based devices. The combined results also confirm the bright prospect of the exciplex-forming system as the co-host for highly efficient and stable OLEDs.
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