The practical application of all-inorganic semiconductor lead halide perovskite nanocrystals (LHP NCs) has been limited by their poor stability. Recently, a lot of research on core—shell structure has been done to improve the stability of perovskite NCs, but the effect was far from the application requirements. Herein, we, for the first time, report a convenient approach to synthesize organic—inorganic double shell CsPbBr₃@SiO₂@polystyrene (PS) NCs with an inter-core of CsPbBr₃, the intermediate layer of SiO₂ shell, and outmost PS shell. Particularly, the CsPbBr₃@SiO₂@PS NCs maintained more than 90% of their initial photoluminescence (PL) intensity under one month’s ultraviolet lamp irradiation or in 85 °C and 85% relative humidity (RH) condition. The white-light-emitting-diodes (WLEDs) were fabricated by encapsulating commercial InGaN chip with CsPbBr₃@SiO₂@PS NCs and K₂SiF₆:Mn⁴⁺ (KSF:Mn⁴⁺) phosphor with a luminous efficacy of ∼ 100 lm/W at 20 mA current and a color gamut of 128% of the National Television Standards Committee (NTSC) standard. In addition, these WLEDs still maintain 91% of the initial luminous efficacy after 1200 h of continuous lighting. These results demonstrated that double shell-protected CsPbBr₃ perovskite NCs have great potential in the field of WLEDs.

全无机半导体卤化铅钙钛矿纳米晶 (LHP NCs) 的实际应用因其稳定性差而受到限制。近年来针对核壳结构进行了大量研究以提高钙钛矿NCs的稳定性，但效果远未达到应用要求。在此，我们首次报道了一种合成有机-无机双壳 CsPbBr ₃ @SiO ₂ @聚苯乙烯 (PS) NCs 的简便方法，其核间为 CsPbBr ₃，中间层为 SiO ₂壳，最外层外壳。特别是，CsPbBr ₃ @SiO ₂@PS NCs 在一个月的紫外线灯照射下或在 85 °C 和 85% 相对湿度 (RH) 条件下保持其初始光致发光 (PL) 强度的 90% 以上。白光发光二极管 (WLED) 是通过用 CsPbBr ₃ @SiO ₂ @PS NCs 和 K ₂ SiF ₆ :Mn ⁴⁺ (KSF:Mn ⁴⁺ ) 磷光体封装商业 InGaN 芯片制造的，发光效率为～ 20 mA 电流时为 100 lm/W，色域为国家电视标准委员会 (NTSC) 标准的 128%。此外，这些 WLED 在连续点亮 1200 小时后仍能保持初始光效的 91%。这些结果表明双壳保护的 CsPbBr ₃钙钛矿 NC 在 WLED 领域具有巨大的潜力。