光致发光
蓝移
相(物质)
卤化物
带隙
材料科学
谱线
金刚石顶砧
凝聚态物理
钻石
吸收(声学)
高压
光电子学
化学
物理
无机化学
热力学
有机化学
复合材料
天文
作者
Ruiping Li,Rong Wang,Ye Yuan,Jianxu Ding,Yingchun Cheng,Zengming Zhang,Wei Huang
标识
DOI:10.1021/acs.jpclett.0c03432
摘要
Lead-free metal halide perovskites CsCu2X3 (X = Cl, Br, I) with a high photoluminescence quantum yield are promising materials for optoelectronic devices. However, the origin of photoluminescence (PL) emission is still under debate, and the anomalous dependence of PL on pressure is unclear. Here, we systemically study the effects of high pressure on the structural, electronic, and optical properties of CsCu2I3 using a diamond anvil cell (DAC) and first-principles calculations. We argue that the ground state structure of CsCu2I3 belongs to the pnma phase rather than the cmcm phase under ambient conditions. There is a structural phase transition from the pnma to the cmcm phase for CsCu2I3 at ∼5 GPa. The optical band gap derivative from absorption spectra increases from 3.57 to 3.62 eV within a pressure range of 0 to 4.03 GPa, and it then decreases over 4.03 GPa. There are two major PL emissions peaks at 2.11 and 2.32 eV, which are attributed to the intrinsic defect related trap states in CsCu2I3. Interestingly, there is an anomalous dependence of both PL emissions on pressure, such that PL peaks show a blueshift and the PL intensity is enhanced from 0 to ∼4 GPa, with redshifting and decreasing at pressures above ∼4 GPa. The anomalous evolution of the two PL emissions also suggests a defect origin of emissions.
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