Pressure-controlled free exciton and self-trapped exciton emission in quasi-one-dimensional hybrid lead bromides

Xu，Bin1; Li，Yawen1; Hong，Peibin1; Zhang，Peijie1; Han，Jiang1; Xiao，Zewen2; Quan，Zewei1

2024-12-01

10.1038/s41467-024-51836-2

Nature Communications   影响因子和分区

2041-1723

Hybrid metal halides represent a novel type of semiconductor light emitters with intriguing excitonic emission properties, including free exciton emission and self-trapped exciton emission. Achieving precise control over these two excitonic emissions in hybrid metal halides is highly desired yet remains challenging. Here, the complete transformation from intrinsically broadband self-trapped exciton emission to distinctively sharp free exciton emission in a quasi-one-dimensional hybrid metal halide (CHN)[PbBr]·6Br with a ribbon width of n = 4, is successfully achieved based on high-pressure method. During compression, pressure-induced phonon hardening continuously reduces exciton–phonon coupling, therefore suppressing excitonic localization and quenching the original self-trapped exciton emission. Notably, further compression triggers excitonic delocalization to induce intense free exciton emission, accompanied with reduced carrier effective masses and improved charge distribution. Controlled high-pressure investigations indicate that the ribbon width of n > 2 is necessary to realize excitonic delocalization and generate free exciton emissions in similar quasi-one-dimensional hybrid metal halides. This work presents an important photophysical process of excitonic transitions from self-trapped exciton emission to free exciton emission in quasi-one-dimensional hybrid metal halides without chemical regulation, promoting the rational synthesis of hybrid metal halides with desired excitonic emissions.

SCI

英语

第一 ; 通讯

2-s2.0-85202213511

Scopus

1.Department of Chemistry,Southern University of Science and Technology (SUSTech),Shenzhen,Guangdong,China
2.Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan,Hubei,China

Xu，Bin,Li，Yawen,Hong，Peibin,et al. Pressure-controlled free exciton and self-trapped exciton emission in quasi-one-dimensional hybrid lead bromides[J]. Nature Communications,2024,15(1).

Xu，Bin.,Li，Yawen.,Hong，Peibin.,Zhang，Peijie.,Han，Jiang.,...&Quan，Zewei.(2024).Pressure-controlled free exciton and self-trapped exciton emission in quasi-one-dimensional hybrid lead bromides.Nature Communications,15(1).

Xu，Bin,et al."Pressure-controlled free exciton and self-trapped exciton emission in quasi-one-dimensional hybrid lead bromides".Nature Communications 15.1(2024).