期刊
CHEMICAL ENGINEERING JOURNAL
卷 423, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.130186
关键词
Thermal stability; Luminescence enhancement; Metal ion doping; DFT calculation; white LEDs; Cs4PbBr6
资金
- National Natural Science Foundation of China [21871079, 11774128]
- Natural Science Foundation of Shandong Province [ZR2018JL003, 2019KJJ003]
- National Science Foundation [1945558]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1945558] Funding Source: National Science Foundation
The study demonstrates that Cs4PbBr6 with higher thermal stability and luminescence intensity can be achieved by Mn2+ doping or Mn2+/Nd3+ co-doping, making it suitable for white light-emitting diodes (LEDs). By combining various emitting materials, efficient white light emission with high LER and CRI values was obtained for indoor lighting applications.
Inorganic metal halide perovskites have superior properties compared to the existing hybrid organic metal halide perovskites, but the issue of poor stability has not been solved, which limits its practical applications. Here, our theoretical and experimental results show that Cs4PbBr6 has higher thermal stability than CsPbBr3, especially, Cs4PbBr6 with higher stability was successfully achieved by Mn2+ doping or Mn2+/Nd3+ co-doping. In addition to the high thermal stability mentioned above, Mn2+ doped or Mn2+/Nd3+ co-doped Cs4PbBr6 has stronger luminescence intensity than pure Cs4PbBr6, which can be applied in white light-emitting diodes (LEDs). The doping of Mn2+ can result in long-lifetime sensitized dopant luminescence and a magnetically coupled exciton state, which weakens the temperature quenching effect of luminescence. We have obtained white light emission by combining blue-emitting CsPbBr3, green-emitting Cs4PbBr6:Mn2+/Nd3+ (or Cs4PbBr6:Mn2+), yellow-emitting CsPbBr0.5I0.5, and red-emitting Eu3+-doped metal-organic frameworks (MOF:Eu3+). The white light shows an LER of 322 lm/W (or 336 lm/W) and a CRI above 90, which is excellent for indoor lighting applications.
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