| Autor: |
Weijiang Gan, Bo-Mei Liu, Lin Huang, Sunqi Lou, Jian Zhang, Zhi Zhou, Jing Wang |
| Zdroj: |
Advanced Optical Materials; 5/4/2022, Vol. 10 Issue 9, p1-8, 8p |
| Abstrakt: |
Lead-free double perovskites (DPs) with unique optical properties are of interest for broad applications. However, improving near-infrared (NIR) photoluminescence (PL) in lead-free DPs is still a challenge. Herein, in order to increase the NIR PL intensity and extend the infrared multicolor luminescence, transition metal Mn2+ is doped into Cs2NaBi1-xErxCl6 lead-free DPs. Steady-state and time-resolved PL studies show that efficient energy transfer from Mn2+ to Er3+ is obtained, leading to NIR PL at ≈1.54 µm can be enhanced 11-fold compared to Er3+ singly alloyed sample and a PL quantum yield of ≈14.2%. Moreover, the Mn2+-mediated sensitized strategy can expand to other NIR lanthanide ions (Ho3+ at ≈0.98 µm or Nd3+ at ≈1.07 µm). The as-synthesized Mn2+ doped Cs2NaBi1-xErxCl6 DPs exhibit robust stability against heat, ultraviolet light, and environmental oxygen/moisture. Finally, the lead-free DPs phosphor-converted multifunctional white light-emitting diode device containing visible and NIR light is fabricated. This work guides constructing energy transfer pathways in DPs and opens new perspectives for the development of lanthanide-functionalized DPs as promising materials for optoelectronic devices operating in the NIR region. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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