磷光
系统间交叉
咔唑
光化学
荧光
有机发光二极管
材料科学
三重态
取代基
磷光有机发光二极管
单重态
分子
光电子学
化学
纳米技术
激发态
原子物理学
图层(电子)
有机化学
物理
光学
作者
Hai‐Tao Feng,Jiajie Zeng,Ping Yin,Xuedong Wang,Qian Peng,Zujin Zhao,Jacky W. Y. Lam,Ben Zhong Tang
标识
DOI:10.1038/s41467-020-16412-4
摘要
Abstract Organic emitters with persistent phosphorescence have shown potential application in optoelectronic devices. However, rational design and phosphorescence tuning are still challenging. Here, a series of metal-free luminophores without heavy atoms and carbonyl groups from commercial/lab-synthesized carbazole and benzene were synthesized to realize tunable molecular emission from fluorescence to phosphorescence by simply substituent variation. All the molecules emit blue fluorescence in both solution and solid state. Upon removal of excitation source, the fluorinated luminophores show obvious phosphorescence. The lab-synthesized carbazole based molecules exhibit a huge lifetime difference to the commercially purchased ones due to the existence of isomer in the latter samples. The small energy gap between singlet and triplet state and low reorganization energy help enhance intersystem crossing to contribute to a more competitive radiative process from triplet to ground state. Blue and white organic light-emitting devices are fabricated by using fluorinated luminophore as emitting layer.
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