Unraveling the Moisture-induced Decomposition Mechanism of Red-Emitting Perovskite CsPbBrI2 Nanocrystals and Enhancing their Stability through Copper(Ⅱ) Substitution

EasyChair Preprint 1080

Abstract

The implementation of red-Emitting perovskite CsPb(Br_xI_1-x)₃ (0<x<1) nanocrystals (NCs) is hindered because of their low structural stability, and the moisture-induced degradation pathways of these red-Emitting perovskite are not well-defined. In the present work, we show that the moisture-induced degradation of CsPbBrI₂ NCs spontaneously forms CsPbBr₃ (α) and CsPbI₃(δ) and other decomposition products. On the other hand, highly stable and luminescent red perovskite CsPbBrI₂ NCs were achieved through copper substitution and halide rich passivation strategy. We demonstrated that the incorporation of Cu²⁺ ions can enhance formation energy, causing a slight lattice contraction, and hence stabilize the cubic phase of these NCs. Cu²⁺-substituted CsPbBrI₂ NCs with higher luminescence were synthesized in a halide-rich passivation method. The highly stable and luminescent Cu²⁺-substituted CsPbBrI₂ NCs can function well as efficient light emitters toward the fabrication of high-performance red perovskite LEDs.

Keyphrases: CsPbBrI2, copper-substitution, light-emitting diodes, perovskite nanocrystals, stability

@booklet{EasyChair:1080,
  author    = {Jibin Zhang and Guoli Tu},
  title     = {Unraveling the Moisture-induced Decomposition Mechanism of Red-Emitting Perovskite CsPbBrI2 Nanocrystals and Enhancing their Stability through Copper(Ⅱ) Substitution},
  howpublished = {EasyChair Preprint 1080},
  year      = {EasyChair, 2019}}