光致发光
量子产额
发光
铒
兴奋剂
激发
材料科学
产量(工程)
红外线的
分析化学(期刊)
绿灯
光电子学
光化学
荧光
光学
化学
物理
蓝光
量子力学
色谱法
冶金
作者
Weiguo Huang,Hui Peng,Qilin Wei,Juan Wang,Ke Bao,Weizheng Liang,Jialong Zhao,B. S. Zou
标识
DOI:10.1021/acs.chemmater.3c03245
摘要
Lanthanide (Ln3+)-doped double perovskites to achieve near-infrared (NIR) emission have been demonstrated to be an effective strategy. However, these emitters generally exhibit low emission efficiencies, which limits further applications. Herein, we synthesized Er3+-doped Cs2NaYCl6 via a hydrothermal reaction. Steady-state and transient fluorescence spectra show that there is a pronounced cross-relaxation between neighboring Er3+, thus boosting the NIR emission with a photoluminescence quantum efficiency (PLQE) of 93 ± 2% (NIR-II region ∼87%). Moreover, the ferromagnetic coupling can enhance the absorption intensity of Er3+; thus, the strongest emission of Er3+-doped Cs2NaYCl6 can be witnessed via direct excitation at 520 nm. The remarkable PLQE and ideal excitation wavelength make Cs2NaYCl6:Er3+ an ideal candidate for the next generation of NIR light sources. In addition, Nd3+ and Yb3+ were also doped in Cs2NaYCl6 successfully, and their respective PLQE values are 51 ± 3% and 30 ± 2%, respectively. Particularly, the emission intensity of Ln3+-doped Cs2NaYCl6 at 440 K can maintain 103% (Er3+), 91% (Nd3+), and 112% (Yb3+) of the initial emission intensity at 300 K. Their admirable properties enable us to demonstrate the application of as-synthesized compounds in night vision and nondestructive testing. Therefore, our findings make Ln3+-doped Cs2NaYCl6 one of the most promising NIR emitters.
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