High-quality CsPbBr3 perovskite nanocrystals for quantum dot light-emitting diodes
High-quality CsPbBr3 perovskite nanocrystals for quantum dot light-emitting diodes
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DOI：
10.1039/c6ra27665b
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发表时间：
2017-01-01
期刊：
影响因子：
3.9
通讯作者：
Chen, Su
中科院分区：
文献类型：
--
作者：
Du, Xiafang;Wu, Guan;Chen, Su
金属卤化物钙钛矿，如 CsPbX3（X = Cl、Br 和 I），由于其在太阳能电池和发光器件等光电应用中的需求不断增加而受到广泛关注。在此，我们报告了一种在室温下通过配体辅助再沉淀合成高质量 CsPbBr3 钙钛矿纳米晶体（尺寸 5-15 nm）的通用方法。单分散CsPbBr3纳米立方钙钛矿表现出相对较高的光致发光量子产率，达到50-80%。凭借量子尺寸效应，带隙能量从蓝色到绿色光谱区域（410-530 nm）被操纵。此外，通过阴离子交换技术的成分调制，明亮的光致发光几乎可以在整个可见光谱区域（450-650 nm）进行调节。此外，CsPbBr3纳米晶体的光致发光特征在于15-50 nm的窄发射线宽度和5-15 ns的辐射寿命。最终，利用这些突出的优点，CsPbBr3钙钛矿成功地应用于高荧光图案和颜色纯度的发光二极管。
Metal halide perovskites, such as CsPbX3 (X = Cl, Br, and I), have gained extensive attention due to their increasing demand in optoelectronic applications such as solar cells and lighting-emitting devices. Herein, we report a versatile approach to synthesize high-quality CsPbBr3 perovskite nanocrystals (sized 5-15 nm) by ligand-assisted reprecipitation at room temperature. The monodispersed CsPbBr3 nanocube perovskites displayed relatively high photoluminescence quantum yields of 50-80%. By virtue of the quantum size effects, the bandgap energies were manipulated from blue to green spectral regions (410-530 nm). In addition, through compositional modulations of the anion exchange technique, the bright photoluminescence could be almost tuned over the entire visible spectral region (450-650 nm). Furthermore, the photoluminescence of the CsPbBr3 nanocrystals was characterized by narrow emission line widths of 15-50 nm and radiative lifetimes of 5-15 ns. Finally, by taking advantage of these outstanding merits, the CsPbBr3 perovskites were successfully utilized in the application of highly fluorescent patterning and color-purity light-emitting diodes.