Composition-Dependent Energy Splitting between Bright and Dark Excitons in Lead Halide Perovskite Nanocrystals

• DOI: 10.1021/acs.nanolett.8b00184
• Publication Date: 2018-02-21T10:07:36Z
• Authors: Lan Chen; Bin Li; Chunfeng Zhang; Xinyu Huang; Xiaoyong Wang; Min Xiao
• Keywords: Biexciton

Perovskite semiconductor nanocrystals with different compositions have shown promise for applications in light-emitting devices. Dark excitonic states may suppress light emission from such by providing an additional nonradiative recombination channel. Here, we study the composition dependence of dark exciton dynamics lead halides time-resolved photoluminescence spectroscopy at cryogenic temperatures. The presence a spin-related state is revealed magneto-optical spectroscopy. energy splitting between bright and found to be highly sensitive both halide elements organic cations, which explained considering effects size confinement charge screening, respectively, on exchange interaction. These findings suggest possibility manipulating perovskite engineering, will instrumental design efficient