Photoluminiscence and absorption of emission by phonons of indirect transitions in layered GaS single crystals

IF 3.8 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Optical Materials Pub Date : 2024-11-01 DOI:10.1016/j.optmat.2024.116395

E. Cristea , A.V. Tiron , E.V. Rusu , A.V. Dorogan , V.V. Zalamai

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Abstract

Absorption in E||b and E⊥c polarizations and photoluminescence at the absorption edge were studied at temperatures range 10–300 K. It was found that the smallest indirect transitions take place from the minimum of conduction band C₁ (point M) to the maximum of valence band V₁ in the Brillouin zone center (point Γ or nearby). A distance between these extrema is 2.4484 eV at 10 K. In addition, the magnitude of indirect transitions from the second band C₂ (point M) to valence band V₁ (Brillouin zone center) is 2.4912 eV at 10 K. The splitting of C₁–C₂ bands in M point of the Brillouin zone is equal to ∼43 meV. The indirect transitions from third conduction band C₃ (point K) to valence band V₁ in the nearby of Γ point are equal to 2.7683 eV at 10 K. The splitting of conduction bands C₂ (point M) and C₃ (point K) is higher than one for the splitting C₁–C₂. It was observed bands associated with self-absorption of photoluminescence emission by phonons with symmetries E_1g¹+A_1g², A_1g²+A_1g¹ and A_1g²+E_2g² involved in indirect transitions.

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层状 GaS 单晶中间接跃迁声子的光致发光和发射吸收

研究发现，从导带 C1 的最小值（M 点）到布里渊区中心（Γ 点或附近）价带 V1 的最大值之间的间接跃迁最小。此外，在 10 K 时，从第二导带 C2（M 点）到价带 V1（布里渊区中心）的间接跃迁幅度为 2.4912 eV。在 10 K 时，从第三导带 C3（K 点）到价带 V1 的间接跃迁在 Γ 点附近等于 2.7683 eV。观察到的带与声子对光致发光发射的自吸收有关，其对称性为 E1g1+A1g2、A1g2+A1g1 和 A1g2+E2g2 参与间接跃迁。

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来源期刊

Optical Materials 工程技术-材料科学：综合

CiteScore

6.60

自引率

12.80%

发文量

1265

审稿时长

38 days

期刊介绍： Optical Materials has an open access mirror journal Optical Materials: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The purpose of Optical Materials is to provide a means of communication and technology transfer between researchers who are interested in materials for potential device applications. The journal publishes original papers and review articles on the design, synthesis, characterisation and applications of optical materials. OPTICAL MATERIALS focuses on: • Optical Properties of Material Systems; • The Materials Aspects of Optical Phenomena; • The Materials Aspects of Devices and Applications. Authors can submit separate research elements describing their data to Data in Brief and methods to Methods X.