期刊
CERAMICS INTERNATIONAL
卷 49, 期 10, 页码 15761-15770出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2023.01.170
关键词
Lead-free double perovskites; Cs2NaInCl6 nanocrystals; Cation-doping; Electron-phonon coupling; Self-trapped exciton
Lead-free double perovskite nanocrystals with tunable self-trapped exciton emission in the blue region are synthesized through A, B-site codoping strategy. The introduction of Sb3+ into the B-site improves the emission efficiency, while altering the amount of A-site doped Rb+ allows for tunable emission peak from 447 to 528 nm. These Rb+, Sb3+-codoped Cs2NaInCl6 nanocrystals exhibit robust photoluminescence and phase stability against moisture, making them promising materials for illumination and display applications.
Lead-free double perovskite nanocrystals (LFDP NCs) are promising materials for illumination and display ap-plications because of their potential to overcome the toxicity and instability of lead-based counterparts. Despite the success in the synthesis of LFDP NCs, tunable control over the photoluminescence (PL) of LFDP NCs is still challenging. Herein, brightly emissive and stable Rb+, Sb3+-codoped Cs2NaInCl6 NCs are synthesized while fulfilling tunable self-trapped exciton (STE) emission in the blue region through the A, B-site codoping strategy. Sb3+ is introduced into the B-site of Cs2NaInCl6 NCs to break the parity-forbidden transition and boost the emission efficiency. By further altering the amount of A-site doped Rb+, the emission peak of the NCs is tunable from 447 to 528 nm, because Rb+ enlarges the electron-phonon coupling energy, which leads to larger Stokes shifts and therefore the continuous red-shift of PL emission. The Rb+, Sb3+-codoped Cs2NaInCl6 NCs exhibit robust PL and phase stability against moisture after one year of storage. A series of LFDP NCs with tunable emission are synthesized according to the codoping strategy and further employed as the color conversion materials for fabricating light-emitting diodes.
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