Optical band gaps and spectroscopy properties of Bi m+/Eu n+/Yb3+ co-doped (m = 0, 2, 3; and n = 2, 3) zinc calcium silicate glasses

Ho Kim Dan; Nguyen Dinh Trung; Nguyen Minh Tam; L T Ha; C V Ha; Dacheng Zhou; Jianbei Qiu

doi:10.1039/d2ra07310b

Optical band gaps and spectroscopy properties of Bi ^m+/Eu ⁿ⁺/Yb³⁺ co-doped (m = 0, 2, 3; and n = 2, 3) zinc calcium silicate glasses

RSC Adv. 2023 Mar 1;13(10):6861-6871. doi: 10.1039/d2ra07310b. eCollection 2023 Feb 21.

Authors

Ho Kim Dan^{1

2}, Nguyen Dinh Trung^{3

4}, Nguyen Minh Tam⁵, L T Ha⁶, C V Ha⁷, Dacheng Zhou⁸, Jianbei Qiu⁸

Affiliations

¹ Optical Materials Research Group, Science and Technology Advanced Institute, Van Lang University Ho Chi Minh City Vietnam.
² Faculty of Applied Technology, School of Technology, Van Lang University Ho Chi Minh City Vietnam hokimdan@vlu.edu.vn.
³ Center for Analysis and Testing, Dalat University Lam Dong Vietnam.
⁴ Faculty of Chemistry and Environment, Dalat University Lam Dong Vietnam.
⁵ Faculty of Basic Sciences, University of Phan Thiet 225 Nguyen Thong Phan Thiet City Binh Thuan Vietnam.
⁶ Institute of Science and Technology, TNU-University of Sciences Thai Nguyen 250000 Vietnam.
⁷ Faculty of Physics, TNU-University of Education Thai Nguyen 250000 Vietnam.
⁸ Key Laboratory of Advanced Materials of Yunnan Province, School of Materials Science and Engineering, Kunming University of Science and Technology Kunming 650093 China.

Abstract

In this study, the indirect/direct optical band gaps and spectroscopy properties of Bi ^m+/Eu ⁿ⁺/Yb³⁺ co-doped (m = 0, 2, 3; and n = 2, 3) zinc calcium silicate glasses under different excitation wavelengths were investigated. Zinc calcium silicate glasses with the main compositions of SiO₂-ZnO-CaF₂-LaF₃-TiO₂ were prepared by the conventional melting method. EDS analysis was performed to determine the elemental composition existing in the zinc calcium silicate glasses. Visible (VIS)-, upconversion (UC)-, and near-infrared (NIR)-emission spectra of Bi ^m+/Eu ⁿ⁺/Yb³⁺ co-doped glasses were also investigated. Indirect optical band gaps and direct optical band gaps of Bi ^m+-, Eu ⁿ⁺- single-doped, and Bi ^m+-Eu ⁿ⁺ co-doped SiO₂-ZnO-CaF₂-LaF₃-TiO₂-Bi₂O₃-EuF₃-YbF₃ zinc calcium silicate glasses were calculated and analyzed. CIE 1931(x, y) color coordinates for VIS and UC emission spectra of Bi ^m+/Eu ⁿ⁺/Yb³⁺ co-doped glasses were determined. Besides, the mechanism of VIS-, UC-, NIR-emissions, and energy transfer (ET) processes between Bi ^m+ and Eu ⁿ⁺ ions were also proposed and discussed.