Incorporating Rare-Earth Terbium(III) Ions into Cs2AgInCl6:Bi Nanocrystals toward Tunable Photoluminescence

Authors：Liu, Ying; Rong, Ximing; Li, Mingze; Molokeev, Maxim S.; Zhao, Jing; Xia, Zhiguo^*

Source：Angewandte Chemie - International Edition, 2020, 59(28): 11634-11640.

DOI：10.1002/anie.202004562

• doping
• energy transfer
• perovskite nanocrystals
• photoluminescence
• terbium

The incorporation of impurity ions or doping is a promising method for controlling the electronic and optical properties and the structural stability of halide perovskite nanocrystals (NCs). Herein, we establish relationships between rare-earth ions doping and intrinsic emission of lead-free double perovskite Cs2AgInCl6 NCs to impart and tune the optical performances in the visible light region. Tb3+ ions were incorporated into Cs2AgInCl6 NCs and occupied In3+ sites as verified by both crystallographic analyses and first-principles calculations. Trace amounts of Bi doping endowed the characteristic emission (D-5(4)-> F-7(6-3)) of Tb3+ ions with a new excitation peak at 368 nm rather than the single characteristic excitation at 290 nm of Tb3+. By controlling Tb3+ ions concentration, the emission colors of Bi-doped Cs2Ag(In1-xTbx)Cl-6 NCs could be continuously tuned from green to orange, through the efficient energy-transfer channel from self-trapped excitons to Tb3+ ions. Our study provides the salient features of the material design of lead-free perovskite NCs and to expand their luminescence applications.

• Institution
  北京科技大学