Blue-emitting CsI thin films

IF 3.3 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence Pub Date : 2025-02-07 DOI:10.1016/j.jlumin.2025.121126

Xuan Huang , Xiaobing Tang , Xiyu Wen , Saurabh Singh , Y. Charles Lu , Fuqian Yang

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引用次数: 0

Abstract

Cesium iodide (CsI) with a blue emission is a promising material for applications in optoelectronic and biomedical fields. However, the low-cost fabrication for CsI with a blue emission remains a challenge. In this work, a facile and green approach to prepare CsI thin films is demonstrated, in which deionized (DI) water makes it possible for non-luminescent CsI powder to form thin films with a blue emission of 415 nm at room temperature. The CsI crystals undergo a crystallization process during the evaporation of the aqueous solution, thus resulting in tensile lattice strain and reducing the bandgap of the CsI crystals. The density functional theory (DFT) calculation reveals that hydrostatic-tensile lattice strain leads to the decrease of the bandgap of CsI crystal. The as-prepared CsI thin films exhibit excellent optical stability that the photoluminescence intensity retains 85 % of initial one after one month in the air. This work is expected to move a step forward for the low-cost manufacturing of CsI films with low energy consumption for blue-emitting devices.

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来源期刊

Journal of Luminescence 物理-光学

CiteScore

6.70

自引率

13.90%

发文量

850

审稿时长

3.8 months

期刊介绍： The purpose of the Journal of Luminescence is to provide a means of communication between scientists in different disciplines who share a common interest in the electronic excited states of molecular, ionic and covalent systems, whether crystalline, amorphous, or liquid. We invite original papers and reviews on such subjects as: exciton and polariton dynamics, dynamics of localized excited states, energy and charge transport in ordered and disordered systems, radiative and non-radiative recombination, relaxation processes, vibronic interactions in electronic excited states, photochemistry in condensed systems, excited state resonance, double resonance, spin dynamics, selective excitation spectroscopy, hole burning, coherent processes in excited states, (e.g. coherent optical transients, photon echoes, transient gratings), multiphoton processes, optical bistability, photochromism, and new techniques for the study of excited states. This list is not intended to be exhaustive. Papers in the traditional areas of optical spectroscopy (absorption, MCD, luminescence, Raman scattering) are welcome. Papers on applications (phosphors, scintillators, electro- and cathodo-luminescence, radiography, bioimaging, solar energy, energy conversion, etc.) are also welcome if they present results of scientific, rather than only technological interest. However, papers containing purely theoretical results, not related to phenomena in the excited states, as well as papers using luminescence spectroscopy to perform routine analytical chemistry or biochemistry procedures, are outside the scope of the journal. Some exceptions will be possible at the discretion of the editors.