Mixed halide perovskite quantum dots (PQDs) show great promise for optoelectronic applications due to their superior optoelectronic properties. However, the poor stability and high toxicity of Pb-based perovskites have hindered the widespread use of CsPb(Br/I)₃ PQDs in optoelectronic devices. In this study, we successfully synthesized stable, pure red CTAB-PQDs:Cu with a high photoluminescence quantum yield (PLQY) by incorporating Cu²⁺ and cetyltrimethylammonium bromide (CTAB) during the fabrication process. The doping of Cu²⁺ causes the lattice contraction of PQDs and reduces the toxicity of PQDs to some extent. Moreover, CTAB played a crucial role in decreasing surface defects and enhancing PQD stability in challenging conditions such as high temperature, water, and light exposure. Owing to the exceptional properties of CTAB-PQDs:Cu, we have developed high-efficiency white light-emitting diodes (WLEDs) by employing these PQDs as a color-conversion layer. The resulting pure white luminescence exhibited a color coordinate of (0.323, 0.334), correlated color temperature of 6000 K, and color gamut of 127%. Our findings offer a valuable alternative material for applications in solid-state lighting and displays.

中文翻译：

---

CTAB 钝化和稳定铜掺杂 CsPb（Br/I）3 量子点，用于白光 LED


混合卤化物钙钛矿量子点 （PQD） 由于其卓越的光电特性，在光电应用中显示出巨大的前景。然而，Pb基钙钛矿的稳定性差、毒性高，阻碍了CsPb（Br/I）₃ PQDs在光电器件中的广泛应用。在这项研究中，通过在制造过程中掺入 Cu²⁺ 和十六烷基三甲基溴化铵 （CTAB），我们成功地合成了稳定的纯红色 CTAB-PQDs：Cu，具有高光致发光量子产率 （PLQY）。Cu²⁺ 的掺杂导致 PQDs 的晶格收缩，并在一定程度上降低了 PQDs 的毒性。此外，CTAB 在减少表面缺陷和增强 PQD 在高温、水和光照等具有挑战性的条件下的稳定性方面发挥了关键作用。由于 CTAB-PQD：Cu 的卓越性能，我们利用这些 PQD 作为颜色转换层开发了高效白光发光二极管 （WLED）。所得纯白色发光表现出 （0.323， 0.334） 的色坐标、6000K 的相关色温和 127% 的色域。我们的研究结果为固态照明和显示器的应用提供了一种有价值的替代材料。