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Ultrastable Zero-Dimensional Cs4PbBr6 Perovskite Quantum Dot Glass
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-07-08 , DOI: 10.1021/acssuschemeng.0c03914
Shasha Li 1 , Guanchen Liu 1 , Qun Liu 1 , Lanjian Nie 2 , Guanpeng Yao 1 , Fanming Zeng 1 , Yaoting He 1 , Weidong Xiang 3
Affiliation  

The instability of all-inorganic perovskites and poor understanding of the photoluminescence mechanisms have hindered their practical applications. While a large body of work on 3-D perovskite phases is available in the literature, the promising zero-dimensional (0-D) phase perovskite materials are still poorly understood. Herein, we report a new synthesis method for the production of 0-D Cs4PbBr6 perovskite quantum dots (QDs) in glass using a combination of Cs2CO3 concentration and heat-treatment temperature optimization. The differences in structure, morphology, and photoluminescence (PL) between the 0-D Cs4PbBr6 QDs and the 3-D CsPbBr3 QDs in glass were studied in detail. Cs4PbBr6 QD glass with high transmittance displayed a blue-shift PL emission centered at 503 nm, a narrow full width at half-maximum (fwhm, ∼20 nm), a high photoluminescence quantum yield (PLQY, ∼22%), and excellent long-term stability, thereby, advancing the study of these materials. It was demonstrated that Cs4PbBr6 displayed unique luminescent properties in correlation with the intrinsic defect states in the mid-band gap.

中文翻译:

超稳定的零维Cs 4 PbBr 6钙钛矿量子点玻璃

全无机钙钛矿的不稳定性以及对光致发光机理的了解不足阻碍了它们的实际应用。尽管文献中有大量关于3-D钙钛矿相的研究,但对于有前景的零维(0-D)相钙钛矿材料仍知之甚少。在这里,我们报告了一种新的合成方法,该方法利用Cs 2 CO 3浓度和热处理温度优化相结合的方法在玻璃中生产0-D Cs 4 PbBr 6钙钛矿量子点(QDs)。0- DC Cs 4 PbBr 6 QD和3-D CsPbBr 3在结构,形态和光致发光(PL)上的差异对玻璃中的量子点进行了详细研究。具有高透射率的Cs 4 PbBr 6 QD玻璃在503 nm处显示蓝移PL发射,在半最大值(fwhm,〜20 nm)处的全宽度窄,光致发光量子产率高(PLQY,〜22%),优异的长期稳定性,从而促进了对这些材料的研究。结果表明,Cs 4 PbBr 6具有与中带隙中的固有缺陷状态相关的独特发光特性。
更新日期:2020-07-27
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