Enhanced photoluminescence of double perovskite CsSnI nanocrystals via Na doping.

Double perovskites without lead element have attracted great attention in recent years. Further increasing the photoluminescence quantum yield of lead-free double perovskites is necessary for their potential applications. In this work, Na doped CsSnI nanocrystals were synthesized by hot injection method.

Enhanced photoluminescence of CsPbBrI nanocrystals via plasmonic Au nanoarrays.

Large scale ordered Au nanoarrays are fabricated by nanosphere lithography technique. The photoluminescence improvement of CsPbBrI nanocrystals by more than three times is realized in the CsPbBrI nanocrystal/Au nanoarray/Si structure. Time-resolved photoluminescence decay curves indicate that the lifetime is decreased by introducing the Au nanoarrays, which results in a increasing radiation recombination rate.