In Situ Embedding Synthesis of Highly Stable CsPbBr3/CsPb2Br5@PbBr(OH) Nano/Microspheres through Water Assisted Strategy

被引：61

作者：

Du, Kaimin ^{[1
,2
]}

He, Lingjun ^{[1
]}

Song, Shuyan ^{[1
,2
]}

Feng, Jing ^{[1
,2
]}

Li, Yao ^{[1
,2
]}

Zhang, Manli ^{[1
,2
]}

Li, Huwei ^{[1
]}

Li, Chengyu ^{[1
,2
]}

Zhang, Hongjie ^{[1
,2
,3
,4
]}

机构：

[1] Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Rare Earth Resource Utilizat, Changchun 130022, Peoples R China

[2] Univ Sci & Technol China, Sch Appl Chem & Engn, Hefei 230026, Peoples R China

[3] Tsinghua Univ, Dept Chem, Beijing 100084, Peoples R China

[4] GBA Natl Inst Nanotechnol Innovat, Guangzhou 510700, Peoples R China

来源：

ADVANCED FUNCTIONAL MATERIALS | 2021年 / 31卷 / 36期

关键词：

perovskites; superior stability; tunable photoluminescence; water additive; WLEDs; LIGHT-EMITTING-DIODES; LEAD HALIDE PEROVSKITES; X-RAY-DETECTORS; NANOWIRE LASERS; HIGH-EFFICIENCY; QUANTUM YIELD; NANOCRYSTALS; CSPBX3; PHOTODETECTORS; LUMINESCENT;

D O I：

10.1002/adfm.202103275

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The disappointing stability of perovskites, especially in water, remains a key issue hindering their further commercialization. Here, CsPbBr3/CsPb2Br5@PbBr(OH) (PQDs@PbBr(OH)) nano/microspheres with superior stability and outstanding photoluminescence quantum yield (PLQY, approximate to 98%) are fabricated through a water-assisted process. The nano/microspheres can maintain excellent photoluminescence (PL) intensity and high PLQY (approximate to 90%) when immersed in water for more than 18 months. By changing the water content in the reaction mixture, the phase, particle size, and PL peaks of the nano/microspheres will change. Compared with CsPbBr3/Cs4PbBr6 nanocrystals synthesized without water, PQDs@PbBr(OH) nano/microspheres exhibit better thermal stability, photostability, and superior stability in water. Based on the first-principles calculations, the enhanced stability results from PbBr(OH) with high decomposition enthalpy in water, which can effectively prevent water from contacting PQDs embedded in it. Moreover, white light-emitting diodes are fabricated by mixing green-emitting PQDs@PbBr(OH) powder and K2SiF6:Mn4+ (KSF) red phosphor on a 460 nm blue chip and the device shows a high luminous efficacy of 101.27 lm W-1 at 10 mA. This work not only provides a reliable method for the facile preparation of ultrastable perovskites, but also has great potentials for future practical applications.

引用

页数：12