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Highly Efficient Blue‐Emitting CsPbBr3 Perovskite Nanocrystals through Neodymium Doping
Advanced Science ( IF 14.3 ) Pub Date : 2020-09-03 , DOI: 10.1002/advs.202001698
Yujun Xie 1 , Bo Peng 2 , Ivona Bravić 2 , Yan Yu 1 , Yurong Dong 1 , Rongqing Liang 1 , Qiongrong Ou 1 , Bartomeu Monserrat 2, 3 , Shuyu Zhang 1
Affiliation  

Colloidal CsPbX3 (X = Br, Cl, and I) perovskite nanocrystals exhibit tunable bandgaps over the entire visible spectrum and high photoluminescence quantum yields in the green and red regions. However, the lack of highly efficient blue‐emitting perovskite nanocrystals limits their development for optoelectronic applications. Herein, neodymium (III) (Nd3+) doped CsPbBr3 nanocrystals are prepared through the ligand‐assisted reprecipitation method at room temperature with tunable photoemission from green to deep blue. A blue‐emitting nanocrystal with a central wavelength at 459 nm, an exceptionally high photoluminescence quantum yield of 90%, and a spectral width of 19 nm is achieved. First principles calculations reveal that the increase in photoluminescence quantum yield upon doping is driven by an enhancement of the exciton binding energy due to increased electron and hole effective masses and an increase in oscillator strength due to shortening of the PbBr bond. Putting these results together, an all‐perovskite white light‐emitting diode is successfully fabricated, demonstrating that B‐site composition engineering is a reliable strategy to further exploit the perovskite family for wider optoelectronic applications.

中文翻译:

通过掺钕高效蓝光 CsPbBr3 钙钛矿纳米晶体

胶体 CsPbX 3(X = Br、Cl 和 I)钙钛矿纳米晶体在整个可见光谱范围内表现出可调节的带隙,并在绿色和红色区域表现出高光致发光量子产率。然而,高效发蓝光钙钛矿纳米晶体的缺乏限制了其在光电应用中的发展。在此,通过配体辅助再沉淀法在室温下制备了钕(III)(Nd 3+)掺杂的CsPbBr 3纳米晶体,其光发射从绿色到深蓝色可调。中心波长为 459 nm 的蓝色发光纳米晶体,光致发光量子产率为 90%,光谱宽度为 19 nm。第一性原理计算表明,掺杂后光致发光量子产率的增加是由于电子和空穴有效质量的增加而导致激子结合能的增强以及由于Pb-Br键的缩短而导致的振荡器强度的增加所驱动。将这些结果结合在一起,成功制造了全钙钛矿白光发光二极管,这表明 B 位成分工程是进一步开发钙钛矿家族以实现更广泛的光电应用的可靠策略。
更新日期:2020-10-22
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