Postsynthesis Phase Transformation for CsPbBr3/Rb4PbBr6 Core/Shell Nanocrystals with Exceptional Photostability
Postsynthesis Phase Transformation for CsPbBr3/Rb4PbBr6 Core/Shell Nanocrystals with Exceptional Photostability
复制标题
具有优异光稳定性的 CsPbBr3/Rb4PbBr6 核/壳纳米晶体的合成后相变
DOI：
10.1021/acsami.8b04198
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发表时间：
2018-07-11
影响因子：
9.5
通讯作者：
Li, Liang
中科院分区：
文献类型：
--
作者：
Wang, Bo;Zhang, Congyang;Li, Liang
卤化铅钙钛矿纳米晶体作为一种很有前途的光电材料得到了广泛的研究。然而，在实现实际应用之前，不稳定性是需要克服的最大挑战之一。为了提高CsPbBr3的稳定性，我们提出了油酸铷处理触发CsPbBr3向CsPbBr3/Rb4PbBr6核/壳结构的合成后控制相变。所得到的核/壳纳米管在溶液和片上都表现出优异的光稳定性。CsPbBr3/Rb4PbBr6 NCs溶液在强发光二极管（450 nm, 175 mW/cm(2)）照射42 h后仍能保持初始发射光致发光量子产额的90%以上，甚至优于传统CdSe/CdS量子点，后者在相同条件下照射18 h后发射量子产额降至50%。我们认为，这种特殊的光稳定性应该是由于在CsPbBr3 nc上保护了坚固的Rb4PbBr6壳层。
Lead halide perovskite nanocrystals (NCs) as promising optoelectronic materials are intensively researched. However, instability is one of the biggest challenges needed to overcome before fulfill their practical applications. To improve their stability, we present a postsynthetic controlled phase transformation of CsPbBr3 toward CsPbBr3/Rb4PbBr6 core/shell structure triggered by rubidium oleate treatment. The resulting core/shell NCs show exceptional photostability both in solution and on-chip. The solution of CsPbBr3/Rb4PbBr6 NCs can remain over 90% of the initial emission photoluminescence quantum yields after 42 h of intense light-emitting diodes illumination (450 nm, 175 mW/cm(2)), which is even better than the conventional CdSe/CdS quantum dots whose emission drop to 50% after 18 h under the same condition. We believe that the exceptional photostability should be resulted from the protection of the robust Rb4PbBr6 shell on CsPbBr3 NCs.