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Phase Engineering of Cesium Manganese Bromides Nanocrystals with Color‐Tunable Emission
Author(s) -
Kong Qingkun,
Yang Bin,
Chen Junsheng,
Zhang Ruiling,
Liu Siping,
Zheng Daoyuan,
Zhang Hongling,
Liu Qingtong,
Wang Yiying,
Han Keli
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202105413
Subject(s) - nanocrystal , materials science , manganese , caesium , annealing (glass) , optoelectronics , phase (matter) , phase transition , photoluminescence , red color , optics , nanotechnology , chemistry , inorganic chemistry , condensed matter physics , metallurgy , composite material , physics , organic chemistry
Abstract For display applications, it is highly desirable to obtain tunable red/green/blue emission. However, lead‐free perovskite nanocrystals (NCs) generally exhibit broadband emission with poor color purity. Herein, we developed a unique phase transition strategy to engineer the emission color of lead‐free cesium manganese bromides NCs and we can achieve a tunable red/green/blue emission with high color purity in these NCs. Such phase transition can be triggered by isopropanol: from one dimensional (1D) CsMnBr 3 NCs (red‐color emission) to zero dimensional (0D) Cs 3 MnBr 5 NCs (green‐color emission). Furthermore, in a humid environment both 1D CsMnBr 3 NCs and 0D Cs 3 MnBr 5 NCs can be transformed into 0D Cs 2 MnBr 4 ⋅2 H 2 O NCs (blue‐color emission). Cs 2 MnBr 4 ⋅2 H 2 O NCs could inversely transform into the mixture of CsMnBr 3 and Cs 3 MnBr 5 phase during the thermal annealing dehydration step. Our work highlights the tunable optical properties in single component NCs via phase engineering and provides a new avenue for future endeavors in light‐emitting devices.