发光
磷光
钙钛矿(结构)
量子产额
材料科学
光电子学
系统间交叉
光化学
余辉
荧光
荧光粉
荧光团
激子
光致发光
激发态
化学
单重态
光学
结晶学
物理
原子物理学
量子力学
伽马射线暴
天文
作者
Shuming Yang,Duobin Wu,Wenjing Gong,Qiuqin Huang,Hongyu Zhen,Qidan Ling,Zhenghuan Lin
出处
期刊:Chemical Science
[The Royal Society of Chemistry]
日期:2018-01-01
卷期号:9 (48): 8975-8981
被引量:118
摘要
Regardless of rapid development of organic room-temperature phosphorescence (RTP) originating from phosphors in crystals, highly efficient and persistent RTP from common fluorophores is very rare. Herein, 1,8-naphthalimide (NI), a common organic fluorophore, is doped into organic cations of 2D layered organic/inorganic hybrid perovskites (OIHPs) to yield thin films and powders with yellow RTP of NI in air. The triplet excitons of NI are mainly derived from Wannier excitons of inorganic perovskite through energy transfer (ET) for films, and from singlet excitons of NI through intersystem crossing (ISC) for powder. Consequently, the quantum yield (ΦP), lifetime (τ) and color of RTP can be tuned by changing the fluorophore and halide in the perovskites, as well as their solid morphology. A white emission, comprising the blue one from the perovskite and yellow RTP (ΦP = 25.6%, τ = 6.3 ms) from NI, is obtained in Br-based OIHPs in powder. Cl-based OIHPs exhibit fluorescence/phosphorescence dual emission in thin films, and yellow afterglow phosphorescence in powders (ΦP = 56.1%, τ = 35 ms). The unique performance of the OIHPs with RTP can make them widely applicable in the field of information technology as security ink, and white and afterglow LEDs as single luminescent materials.
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