Efficient Yellow Self-Trapped Exciton Emission in Sb-Doped RbCdCl Metal Halides.

Inorg Chem

Guangxi Key Lab of Processing for Nonferrous Metals and Featured Materials and Key Lab of New Processing Technology for Nonferrous Metals and Materials, Ministry of Education; School of Resources, Environments and Materials, Guangxi University, Nanning 530004, China.

Published: May 2022

AI Article Synopsis

  • * The study focused on Sb-doped RbCdCl crystalline powder, which was created using a simple hydrothermal method, revealing it emits efficient yellow light at around 596 nm with a high quantum yield of 91.7%.
  • * The emission properties are influenced by temperature and involve transitions between self-trapped exciton states, resulting in a shift to white light at lower temperatures, suggesting potential applications in temperature sensing.

Article Abstract

Metal halide perovskites have flexible crystal and electronic structures and adjustable emission characteristics, which have very broad applications in the optoelectronic field. Among them, all-inorganic perovskites have attracted more attention than others in recent years because of their characteristics of large diffusion length, high luminescence efficiency, and good stability. In this work, Sb-doped RbCdCl crystalline powder was synthesized by a simple hydrothermal method, and its luminescence properties were studied, which showed a broad emission band with a large Stokes shift and efficient yellow light emission at about 596 nm at room temperature with a photoluminescence quantum yield of 91.7%. The emission came from the transition of the self-trapped exciton 1 (STE1) out of P ( = 0, 1, and 2) to S due to strong electron-phonon coupling, which scaled with increasing temperature. Moreover, its emission color became white at low temperatures due to the occurrence of transition of other self-trapped exciton 0 (STE0) state emission out of the S states of Sb ions to S in the lattice. These emission color changes may be used for temperature sensing, and this Sb-doped RbCdCl material expands the knowledge of the efficient luminescent inorganic material family for further applications of all-inorganic perovskites.

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Source
http://dx.doi.org/10.1021/acs.inorgchem.2c00667DOI Listing

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