View in EDS

Efficient and stable CsPbBr3/Cs4PbBr6 composite powders passivated and encapsulated with a novel silicon-based ligand.

Saved in:
Bibliographic Details
Title: Efficient and stable CsPbBr3/Cs4PbBr6 composite powders passivated and encapsulated with a novel silicon-based ligand.
Authors: Yang, Rui Rui1,2 (AUTHOR), Lian, Hui Wang2 (AUTHOR), Lan, Bang1 (AUTHOR), Cao, Ren Ping1 (AUTHOR), Zhang, Feng Ru1 (AUTHOR) zhangfengru@126.com, Wang, Jing1,2,3 (AUTHOR) ceswj@mail.sysu.edu.cn
Source: Journal of Luminescence. Nov2024, Vol. 275, pN.PAG-N.PAG. 1p.
Subjects: Ligands (Chemistry), Metal halides, Surface defects, Thermocycling, Surface states
Abstract: The metal halide perovskite have garnered significant attention for their exceptional photoelectric properties. However, their inherent instability and the sharp decrease of photoluminescence quantum yield (PLQY) in the solid-state significantly limit their practical applications. Appropriate heterojunction structures or matrix encapsulation can efficiently improve the PLQY and stability of the metal halide perovskite. Herein, we report a new silicon-based ligand hydrolysis condensation encapsulation to synthesize CsPbBr 3 /Cs 4 PbBr 6 /BTESPA-x (CPB–Si-x) composite powders with improved luminescence properties and enhanced thermal stability. With the increase of BTESPA (from 0 to 150 μL), the efficient hydrolysis condensation process occurs on the surface of CsPbBr 3 /Cs 4 PbBr 6. Finally, the abundant amino-silane groups in BTESPA bind to undercoordinated Pb2+, thereby suppressing the surface defect states and enhancing the PLQY from 34.3 % for CsPbBr 3 /Cs 4 PbBr 6 (CPB) to 82.1 % for CPB-Si-5. Simultaneously, the thermal stability of CPB-Si-5 exhibits a 13 % improvement over that of CPB after undergoing thermal cycling. Furthermore, tricolor white light-emitting-diode (WLEDs) with high color rendering index were fabricated using on-chip blue LED with bright green-emissive CPB-Si-5 composite powder and red-emissive K 2 SiF 6 :Mn4+ phosphor, demonstrating the potential applicability of these powders in WLED backlight systems. • A new silicon-based ligand BTESPA modified CsPbBr 3 /Cs 4 PbBr 6 composite powders have been successfully fabricated. • BTESPA ligands suppress the surface defects by binding to undercoordinated Pb2+ on the surface of CsPbBr 3 /Cs 4 PbBr 6. • After the BTESPA ligands were encapsulated, the PLQY of CsPbBr 3 /Cs 4 PbBr 6 increased from 34.3 % to 82.1 %. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Luminescence is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
Description
Abstract:The metal halide perovskite have garnered significant attention for their exceptional photoelectric properties. However, their inherent instability and the sharp decrease of photoluminescence quantum yield (PLQY) in the solid-state significantly limit their practical applications. Appropriate heterojunction structures or matrix encapsulation can efficiently improve the PLQY and stability of the metal halide perovskite. Herein, we report a new silicon-based ligand hydrolysis condensation encapsulation to synthesize CsPbBr 3 /Cs 4 PbBr 6 /BTESPA-x (CPB–Si-x) composite powders with improved luminescence properties and enhanced thermal stability. With the increase of BTESPA (from 0 to 150 μL), the efficient hydrolysis condensation process occurs on the surface of CsPbBr 3 /Cs 4 PbBr 6. Finally, the abundant amino-silane groups in BTESPA bind to undercoordinated Pb2+, thereby suppressing the surface defect states and enhancing the PLQY from 34.3 % for CsPbBr 3 /Cs 4 PbBr 6 (CPB) to 82.1 % for CPB-Si-5. Simultaneously, the thermal stability of CPB-Si-5 exhibits a 13 % improvement over that of CPB after undergoing thermal cycling. Furthermore, tricolor white light-emitting-diode (WLEDs) with high color rendering index were fabricated using on-chip blue LED with bright green-emissive CPB-Si-5 composite powder and red-emissive K 2 SiF 6 :Mn4+ phosphor, demonstrating the potential applicability of these powders in WLED backlight systems. • A new silicon-based ligand BTESPA modified CsPbBr 3 /Cs 4 PbBr 6 composite powders have been successfully fabricated. • BTESPA ligands suppress the surface defects by binding to undercoordinated Pb2+ on the surface of CsPbBr 3 /Cs 4 PbBr 6. • After the BTESPA ligands were encapsulated, the PLQY of CsPbBr 3 /Cs 4 PbBr 6 increased from 34.3 % to 82.1 %. [ABSTRACT FROM AUTHOR]
ISSN:00222313
DOI:10.1016/j.jlumin.2024.120763