材料科学
发光效率
量子点
光致发光
兴奋剂
光电子学
发光二极管
二极管
钙钛矿(结构)
离子
发光
纳米技术
化学
结晶学
有机化学
图层(电子)
作者
Yan Zhu,Jinyang Zhu,Haizhen Song,J. S. Huang,Zhiwen Lu,Gencai Pan
标识
DOI:10.1016/j.jre.2020.06.007
摘要
Considering the toxicity problem of lead-based perovskite quantum dots (PQDs), the lead-free Cs3Bi2Br9 PQDs has been recognized as one of the promising candidates. However, the low photoluminescence quantum yields (PLQYs) hinder its practical application in optoelectronic devices. Here, we successfully prepared Sm3+ ions doped Cs3Bi2Br9 PQDs with effective white light-emission by modified ligand-assisted recrystallization method. The realization of white light-emission is attributed to the broadband blue emission of excitons and the red emission (4G5/2–6HJ (J = 5/2, 7/2, 9/2)) of Sm3+ ions for Sm3+ ions doped Cs3Bi2Br9 PQDs. More importantly, compared with the undoped Cs3Bi2Br9 PQDs, the PLQYs of Sm3+ ions doped Cs3Bi2Br9 PQDs are improved from 10.9% to 20.8%, and the anti-water stability is also obviously improved. Finally, the Sm3+ ions doped PQDs based white light-emitting diodes (LEDs) with luminous efficiency of 12.6 lm/W were explored, which indicates that there is a potential prospect of lead-free PQDs in white light lighting application.
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