Samarium doping improves luminescence efficiency of Cs3Bi2Br9 perovskite quantum dots enabling efficient white light-emitting diodes

• 作者: Yongsheng Zhu Jinyang Zhu Haizhen Song Jinshu Huang Zhiwen Lu Gencai Pan
• 来源期刊: 稀土学报（英文版）
• 年，卷（期）: 2021,（4）
• 所属期刊栏目: SPECTROSCOPY, LUMINESCENCE AND PHOSPHORS
• 页码范围: 374-379
• 页数: 6页
• 语种: 英文

摘要

Considering the toxicity problem of lead-based perovskite quantum dots(PQDs),the lead-free Cs3Bi2Brg 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 Cs3Bi2Brg PQDs with effective white light-emission by modified ligand-assisted recrystallization method.The realization of white light-emission is attributed to the broad-band 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 Cs3Bi2Br 9 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.