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CsPbBr 3 nanocrystals have been identified as a highly promising material for various optoelectronic applications. However, they tend to coexist with Cs 4 PbBr 6 phase when the reaction conditions are not controlled carefully. It is therefore imperative to understand how the presence of this phase affects the luminescence performance of CsPbBr 3 nanocrystals . We synthesized a mixed CsPbBr 3 -Cs 4 PbBr 6 sample, and compared its photo- and radioluminescence properties, including timing characteristics, to the performance of pure CsPbBr 3 nanocrystals. The possibility of energy transfer between the two phases was also explored. We demonstrated that the presence of Cs 4 PbBr 6 causes significant drop in radioluminescence intensity of CsPbBr 3 nanocrystals, which can limit possible future applications of Cs 4 PbBr 6 -CsPbBr 3 mixtures or composites as scintillation detectors.

On the Role of Cs4PbBr6 Phase in the Luminescence Performance of Bright CsPbBr3 Nanocrystals