Efficient near-infrared emission in lanthanum ion doped double perovskite Cs2NaScCl6 via Cr3+ sensitization under visible light excitation
Weiguo Huang, Hui Peng, Jinling Huang, Ye Yang, Qilin Wei, Bao Ke, Muhammad Sheraz Khan, Jialong Zhao, Bingsuo Zou
Efficient near-infrared emission in lanthanum ion doped double perovskite Cs2NaScCl6 via Cr3+ sensitization under visible light excitation
Herein, we synthesized Cr3+/Ln3+ (Er3+, Tm3+)-codoped rare earth-based Cs2NaScCl6 double perovskite, and the near-infrared emission of Ln3+ can be excited by visible light through the energy transfer (ET) from Cr3+ to Ln3+. Moreover, there are two independent emission bands, which stems from 4T2 → 4A2 transition of Cr3+ (970 nm) and f-f transition of Ln3+ (1542 nm for Er3+ and 1220 nm for Tm3+), respectively. Particularly, both compounds have ultra-high photoluminescence quantum yield (PLQY) of 60% for 10%Cr3+/6%Er3+-codoped Cs2NaScCl6 (Er3+ emission: ~26%) and 68% for 10%Cr3+/4.5%Tm3+-codoped Cs2NaScCl6 (Tm3+ emission: ~56%), which can be attributed to the ultra-high ET efficiency from Cr3+ to Ln3+ and the similar ionic activity of Sc3+ and Ln3+ allowing more dopants enter the host lattice. Considering the excellent stability of the samples, we demonstrated Cr3+/Tm3+-codoped Cs2NaScCl6 in the applications of near-infrared imaging and night vision. Finally, we reported 10%Cr3+/4.5%Tm3+/9%Er3+-tridoped Cs2NaScCl6 and further applied it for optical thermometry.
Cr3+ sensitization / energy transfer / green light excitation / lead-free double perovskite / near-infrared emission
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