Anomalously ultra-strong anti-Stokes photoluminescence in submicrometer-thick van der Waals layered semiconductor PbI2

IF 6.8 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Science China Materials Pub Date : 2025-03-12 DOI:10.1007/s40843-024-3272-5

Xiaofei Yue (, ), Qingqing Nie (, ), Jiajun Chen (, ), Shuwen Shen (, ), Jinkun Han (, ), Yabing Shan (, ), Wenxuan Wu (, ), Yuan Lin (, ), Xueting Zhou (, ), Ye Lu (, ), Laigui Hu (, ), Ran Liu (, ), Zhijun Qiu (, ), Chunxiao Cong (, )

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引用次数: 0

Abstract

Anti-Stokes photoluminescence (ASPL) in low-dimensional van der Waals (vdW) layered materials is becoming increasingly attractive for its potential in advanced applications such as optical cooling, sub-energy band detection and optoelectronic devices. While transition metal dichalcogenides (TMDCs), among the most studied vdW semiconductors for ASPL, exhibit a direct bandgap exclusively in their monolayer form. This characteristic results in a short light-matter interaction distance and thus low ASPL emission efficiency, which seriously impedes the advancement of ASPL in vdW layered materials. In contrast, transition metal halide lead iodide (PbI₂), a vdW semiconductor with a direct bandgap in a wide range of thicknesses (⩾3 layers) superior to TMDCs, has shown promise for ASPL. However, the reported ASPL emission efficiency of PbI₂ is notably low. Moreover, scant research has focused on the rich ASPL emission states in PbI₂, particularly concerning the assignment of these emission states. Here, through a designed thickness selection, we observed more detailed ASPL emissions in submicrometer-thick PbI₂ at room temperature, in addition to a series of previously unreported ASPL emission peaks that emerge at low temperatures. Importantly, the low-temperature ASPL of PbI₂ exhibits an approximate 1000-fold enhancement compared to that observed at room temperature. This significant enhancement is attributed to the transition from phonon-assisted one-photon absorption to two-step photon absorption induced by resonance absorption effect, as well as substantially reduced nonradiative decays at low temperatures. Our findings enhance the comprehensive understanding of ASPL in PbI₂, holding great significance for the development of ASPL applications.

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来源期刊

Science China Materials Materials Science-General Materials Science

CiteScore

11.40

自引率

7.40%

发文量

949

期刊介绍： Science China Materials (SCM) is a globally peer-reviewed journal that covers all facets of materials science. It is supervised by the Chinese Academy of Sciences and co-sponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China. The journal is jointly published monthly in both printed and electronic forms by Science China Press and Springer. The aim of SCM is to encourage communication of high-quality, innovative research results at the cutting-edge interface of materials science with chemistry, physics, biology, and engineering. It focuses on breakthroughs from around the world and aims to become a world-leading academic journal for materials science.