Substitution of Pb with Mn2+/Nd3+ to improve the luminescence and thermal stability of Cs4PbBr6

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.