Affiliation:
1. School of Materials Science and Engineering Qingdao University of Science and Technology Qingdao 266042 P. R. China
2. Center for Future Optoelectronic Functional Materials School of Computer and Electronic Information/School of Artificial Intelligence Nanjing Normal University Nanjing 210023 P. R. China
3. Dalian University of Technology Corporation of Changshu Research Institution Suzhou 215500 P. R. China
Abstract
AbstractDouble perovskite (DP) is considered as a promising candidate for single‐component white‐light emitters. However, the photoluminescence (PL) efficiency of the small sized DP, such as microcrystals and nanocrystals, is generally unsatisfactory. In this work, by comparing the Sb/Bi co‐doped Cs2NaInCl6 microcrystals prepared at different conditions, it is revealed that the PL spectral profile and efficiency are highly dependent on intrinsic strain effect. All the Sb/Bi co‐doped Cs2NaInCl6 DPs exhibit blue PL at ≈445 nm and yellow PL at ≈560 nm. When the crystal size decreases, the release of local strain results in a significant quenching in the emission intensity. Accordingly, by optimizing the reaction conditions to introduce sufficient lattice mismatch, high PL quantum yields (QYs) of 76.38% and 86.44% are obtained for blue and yellow PL, respectively. Moreover, a white light‐emitting convertor with a high colour rendering index (CRI) of 90.0 is fabricated, which shows a luminous efficiency of 40.4 lm W−1.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Shandong Province
Taishan Scholar Project of Shandong Province
China Postdoctoral Science Foundation
Subject
Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials