TY - JOUR

T1 - Bismuth-doped gadolinium oxide films for UV-Vis multicolor conversion: Combined XPS, DFT and photoluminescence study

AU - Zatsepin, Anatoly F.

AU - Kuznetsova, Yulia A.

AU - Zatsepin, Dmitry A.

AU - Wong, Chi-Ho

AU - Law, Wing-cheung

AU - Tang, Chak-Yin

AU - Gavrilov, Nikolay V.

AU - Boukhwalov, Danil V.

N1 - This work was supported by the Russian Science Foundation (Project No. 21-12-00392 ).

PY - 2023/7/1

Y1 - 2023/7/1

N2 - Results of XPS characterization, theoretical modeling and photoluminescence study of bismuth-implanted gadolinium oxide (Gd2O3:Bi) films are presented. Scenarios for the introduction of bismuth ions into amorphous-crystalline Gd2O3 host and mechanisms for the formation of optically active centers are considered. It has been demonstrated that the optical properties of Gd2O3:Bi films are guided by the interplay of a quite complex system of single Bi2+ ions, (Bi3+–Bi3+) pairs and single Bi3+-ions, oxygen vacancies and "defective" gadolinium ions. Photoinduced excitation-relaxation processes involving various Bi-related centers and defect states of the host are observed. Due to the multicolor emission (red, green and blue) of single Bi2+ ions, (Bi3+- Bi3+) pairs and single Bi3+ ions excited in the ultraviolet spectral range, the UV–VIS energy conversion in a wide spectral range is realized. The advantage of Gd2O3:Bi as a material for energy conversion lies in the fact that due to the polyvalence of bismuth and the variety of different optical centers, a wide range of both absorbed UV light and emitted VIS light is involved in the conversion. This indicates the prospects for practical use of Gd2O3:Bi films as multifunctional material for energy conversion and photo-detection systems.

AB - Results of XPS characterization, theoretical modeling and photoluminescence study of bismuth-implanted gadolinium oxide (Gd2O3:Bi) films are presented. Scenarios for the introduction of bismuth ions into amorphous-crystalline Gd2O3 host and mechanisms for the formation of optically active centers are considered. It has been demonstrated that the optical properties of Gd2O3:Bi films are guided by the interplay of a quite complex system of single Bi2+ ions, (Bi3+–Bi3+) pairs and single Bi3+-ions, oxygen vacancies and "defective" gadolinium ions. Photoinduced excitation-relaxation processes involving various Bi-related centers and defect states of the host are observed. Due to the multicolor emission (red, green and blue) of single Bi2+ ions, (Bi3+- Bi3+) pairs and single Bi3+ ions excited in the ultraviolet spectral range, the UV–VIS energy conversion in a wide spectral range is realized. The advantage of Gd2O3:Bi as a material for energy conversion lies in the fact that due to the polyvalence of bismuth and the variety of different optical centers, a wide range of both absorbed UV light and emitted VIS light is involved in the conversion. This indicates the prospects for practical use of Gd2O3:Bi films as multifunctional material for energy conversion and photo-detection systems.

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U2 - 10.1016/j.jallcom.2023.169815

DO - 10.1016/j.jallcom.2023.169815

M3 - Article

VL - 949

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

SN - 0925-8388

M1 - 169815

ER -