Premium
Long Persistent Luminescence from All‐Inorganic Perovskite Nanocrystals
Author(s) -
Zhang Hao,
Yang Ze,
Zhao Lei,
Cao Jiangyan,
Yu Xue,
Yang Yang Michael,
Yu Siufung,
Qiu Jianbei,
Xu Xuhui
Publication year - 2020
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.202000585
Subject(s) - materials science , nanocrystal , luminescence , photoluminescence , perovskite (structure) , halide , fabrication , quantum yield , nanotechnology , optoelectronics , amorphous solid , lanthanide , ion , chemical engineering , inorganic chemistry , optics , crystallography , fluorescence , chemistry , engineering , medicine , alternative medicine , physics , organic chemistry , pathology
Abstract The advantages of ultrahigh photoluminescence quantum yield and narrow spectral bandwidth of all‐inorganic lead halide perovskite nanocrystals (NCs) enable them as the most potential candidates for optoelectronic applications. However, it is difficult to obtain long persistent luminescence from inorganic perovskite nanocrystals as the creation of effective trapping centers comes along with the generation of nonradioactive recombination centers. Here, replacing Pb 2+ by appropriate lanthanide ions (Ln 3+ ) in CsPbBr 3 nanocrystals that are embedded inside an amorphous transparent medium via a high‐temperature (≈500 °C) fabrication process is proposed to achieve stable and effective trapping centers. Furthermore, the surface coating of the enclosed nanocrystals prevents the formation of surface defects, leading to long persistent luminescence from CsPbBr 3 : Ln 3+ NCs. The CsPbBr 3 : Ln 3+ NCs with unprecedented high color purity (≈89.9%) and long lasting time of more than 1800 s could be a promising candidate for the application in anti‐counterfeiting.