Low temperature synthesis of high-quality all-inorganic cesium lead halide perovskite nanocrystals in open air and their upconversion luminescence
Low temperature synthesis of high-quality all-inorganic cesium lead halide perovskite nanocrystals in open air and their upconversion luminescence
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露天低温合成高品质全无机铯铅卤化物钙钛矿纳米晶及其上转换发光
DOI：
10.1016/j.jallcom.2017.09.284
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发表时间：
2018
影响因子：
6.2
通讯作者：
Qu Junle
中科院分区：
文献类型：
--
作者：
Ye Shuai;Yu Minghuai;Zhao Mengjie;Song Jun;Qu Junle
本研究开发了一种一步法低成本合成全无机卤化铯铅钙钛矿纳米晶的方法。将PbX 2和Cs2 CO 3加入到含有1-十八烯（ODE）、油酸（OA）和油胺（奥拉）的混合物中，并在空气中在80-100 ℃下加热15-30分钟。所得高质量的立方状CsPbX 3纳米晶体是单分散的，尺寸为7-15 nm，并显示出强的光致发光（PL），具有14-43 nm的窄的可调谐发射带和高的量子产率（约90%）。通过测试温度和表面配体（OA/奥拉）对晶体形貌和发光强度的影响，研究了成核和生长机制。高质量的CsPbX 3纳米晶体进一步证实了高效的上转换PL与高能量增益，这里观察到的第一次为胶体CsPb（Br/I）3纳米晶体，具有高于430 meV的能量增益，这主要是由于反斯托克斯生成，而不是多光子效应。
In this work, a single-step and low-cost synthesis of all-inorganic cesium lead halide perovskite nanocrystals was developed. PbX2and Cs2CO3were added to a mixture containing 1-octadecene (ODE), oleic acid (OA) and oleylamine (OLA), and heated at 80–100 °C for 15–30 min in air. The resultant high-quality cube-like CsPbX3nanocrystals are monodisperse with dimensions of 7–15 nm, and display strong photoluminescence (PL) with a narrow, tuneable emission band of 14–43 nm and a high quantum yield (∼90%). The mechanisms of nucleation and growth were investigated by testing the effects of temperature and surface ligands (OA/OLA) on the crystal morphology and PL intensity. The high quality of the CsPbX3nanocrystals was further confirmed by efficient upconversion PL with high energy gain, observed here for the first time for colloidal CsPb(Br/I)3nanocrystals, with an energy gain higher than 430 meV that was mainly attributed to anti-stokes generation rather than the multiphoton effect.