Abstract 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.

中文翻译：

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钐掺杂提高了 Cs3Bi2Br9 钙钛矿量子点的发光效率，从而实现高效的白光发光二极管

摘要 考虑到铅基钙钛矿量子点（PQDs）的毒性问题，无铅 Cs3Bi2Br9 PQDs 被认为是有前景的候选材料之一。然而，低光致发光量子产率（PLQY）阻碍了其在光电器件中的实际应用。在这里，我们通过改进的配体辅助重结晶方法成功制备了具有有效白光发射的 Sm3+ 离子掺杂的 Cs3Bi2Br9 PQD。白光发射的实现归因于激子的宽带蓝色发射和 Sm3+ 离子掺杂 Cs3Bi2Br9 的 Sm3+ 离子的红色发射 (4G5/2–6HJ (J = 5/2, 7/2, 9/2)) PQD。更重要的是，与未掺杂的Cs3Bi2Br9 PQDs相比，Sm3+离子掺杂的Cs3Bi2Br9 PQDs的PLQYs从10.9%提高到20.8%，抗水稳定性也明显提高。最后，