Photoluminescence and nonlinear transmission of GaSe thin films

IF 3.3 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence Pub Date : 2025-05-13 DOI:10.1016/j.jlumin.2025.121293

M.A. Samsonov , A. Hasan , D.M. Zhigunov , V.N. Mantsevich , A.M. Smirnov

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Abstract

We present the analysis of linear and nonlinear optical properties of gallium selenide (GaSe) films measured by means of pump and probe technique. GaSe films with different thickness were obtained by mechanical exfoliation approach. The exciton transition bleaching was observed under excitation of 10 ns pulses centered at 360 nm and 540 nm, which was explained by the exciton phase space filling effect. The main mechanisms of recombination of excited charge carriers at room temperature were established and their kinetic properties were studied. Three bands were identified within the measured photoluminescence (PL) spectra of GaSe films. The detuning of the maxima of these PL bands was shown to be stable across different samples, different excitation energies, and different excitation wavelengths. This consistency of relative peak positions indicates their physical nature. We were able to identify the contribution to PL signal from direct excitons, indirect excitons and electron-hole pairs with the participation of optical phonons. The theoretical model was proposed, which allowed to analyze electron, hole and exciton kinetics measured by time-resolved PL.

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GaSe薄膜的光致发光和非线性透射

本文用泵浦和探针技术对硒化镓薄膜的线性和非线性光学特性进行了分析。采用机械剥离法制备了不同厚度的GaSe薄膜。在以360 nm和540 nm为中心的10 ns脉冲激发下，发现了激子跃迁漂白现象，这与激子相空间填充效应有关。建立了室温下激发态载流子复合的主要机理，研究了其动力学性质。在测量的GaSe薄膜的光致发光（PL）光谱中鉴定出三个波段。在不同的样品、不同的激发能和不同的激发波长中，这些PL波段的最大值失谐是稳定的。这种相对峰位的一致性表明了它们的物理性质。我们能够确定直接激子、间接激子和有光学声子参与的电子空穴对PL信号的贡献。建立了理论模型，对时间分辨PL测量的电子、空穴和激子动力学进行了分析。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.