Enhanced Luminescence and Stability of Cesium Lead Halide Perovskite CsPbX3 Nanocrystals by Cu2+-Assisted Anion Exchange Reactions

被引：77

作者：

Chen, Yi-Chia ^{[1
]}

Chou, Hung-Lung ^{[2
]}

Lin, Jou-Chun ^{[1
]}

Lee, Yi-Cheng ^{[1
]}

Pao, Chih-Wen ^{[3
]}

Chen, Jeng-Lung ^{[3
]}

Chang, Chia-Che ^{[1
]}

Chi, Ruei-Yu ^{[4
]}

Kuo, Tsung-Rong ^{[5
]}

Lu, Chin-Wei ^{[4
]}

Wang, Di-Yan ^{[1
]}

机构：

[1] Tunghai Univ, Dept Chem, Taichung 40704, Taiwan

[2] Natl Taiwan Univ Sci & Technol, Grad Inst Appl Sci & Technol, Taipei 10607, Taiwan

[3] Natl Synchrotron Radiat Res Ctr, Hsinchu 30076, Taiwan

[4] Providence Univ, Dept Appl Chem, Taichung 43301, Taiwan

[5] Taipei Med Univ, Grad Inst Nanomed & Med Engn, Coll Biomed Engn, Taipei 11031, Taiwan

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2019年 / 123卷 / 04期

关键词：

QUANTUM DOTS; PHOTOLUMINESCENCE; BR; CL; PHASE; EFFICIENCY;

D O I：

10.1021/acs.jpcc.8b11535

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Inorganic CsPbX3 perovskite nanocrystals (NCs) have exhibited great optical properties, such as tunable emission wave-length, narrow emission line-widths, and high photoluminescent quantum yields. However, the unstable crystal structure of perovskite CsPbX3 NCs lead to a deterioration in optical performance. In this work, it is demonstrated that inorganic perovskite NCs, including CsPbCl3 and CsPbBr3-xClx NCs with excellent photoluminescence quantum yield and optical stability can be improved via anion exchange reaction treated with a new halide precursor consisting of copper halide (CuX2-) oleylamine (OLA) complexes. Unlike traditional perovskite synthesized processes for better crystalline structures operated at high temperatures, this work offers an economical method operable at the room temperatures. The treated CsPbX3 perovskite nanocrystals were characterized by in situ photoluminescence (PL) spectra and in situ X-ray (XRD). Cu2+ ions were only absorbed on the surface of perovskite NCs confirmed by the X-ray absorption spectroscopy (XAS) analysis. Density functional theory calculation explained that the origin of high stability and good crystallinity for treated perovskite NCs stemmed from adsorption of CuCl2 on perovskite's surface to passivate defect sites during the recrystallization process. diffraction

引用

页码：2353 / 2360

页数：8