Tunable greenish-to-reddish light generation via energy transfer in Tb3+/Sm3+-codoped PbGeO3:PbF2:CdF2 glass under UV excitation

Rafaela T. Alves; Luciano A. Bueno; Artur Da S. Gouveia-Neto

doi:10.1117/1.OE.58.1.017105

23 January 2019 Tunable greenish-to-reddish light generation via energy transfer in Tb³⁺/Sm³⁺-codoped PbGeO₃:PbF₂:CdF₂ glass under UV excitation

Rafaela T. Alves, Luciano A. Bueno, Artur Da S. Gouveia-Neto

Author Affiliations +

Funded by: National Council for Scientific and Technological Development (CNPq), Ministry of Science, Technology and Innovation | Conselho Nacional de Desenvolvimento Científico e Tecnológico (National Council for Scientific and Technological Development), CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico), Financiadora de Estudos e Projetos, Coordination for the Improvement of Higher Education Personnel, Coordenação de Aperfeiçoamento de Pessoal de Ensino Superior (CAPES)

Optical Engineering, Vol. 58, Issue 1, 017105 (January 2019). https://doi.org/10.1117/1.OE.58.1.017105

Abstract

Generation of tunable greenish–yellowish–reddish luminescence mediated by energy transfer in Tb^3 + / Sm^3 +-codoped fluorogermanate glass under UV light excitation is reported. Fluorescence emissions around 487, 542, 561, 582, 600, 620, 645, 650, and 706 nm were obtained in double-doped samples under 355- and 375-nm excitation wavelengths. The relative intensity of the Sm^3 + and Tb^3 + ions’ individual distinctive emissions depends upon the excitation wavelength, relative ions concentration, and the energy transfer of Tb^3 + to Sm^3 + mechanism, which lead to the tonality tunable overall luminescent color. The CIE-1931 chromaticity coordinates of the overall luminescence resided in the range (0.31; 0.59) to (0.62; 0.37). Time decay measurements indicated efficient Tb^3 + to Sm^3 + energy-transfer process with a substantial decrease (1.65 to 0.85 ms) of Tb^3 + emitting levels due to the presence of Sm^3 + ions in the host matrix.

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Rafaela T. Alves, Luciano A. Bueno, and Artur Da S. Gouveia-Neto "Tunable greenish-to-reddish light generation via energy transfer in Tb³⁺/Sm³⁺-codoped PbGeO₃:PbF₂:CdF₂ glass under UV excitation," Optical Engineering 58(1), 017105 (23 January 2019). https://doi.org/10.1117/1.OE.58.1.017105

Received: 24 October 2018; Accepted: 27 December 2018; Published: 23 January 2019

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KEYWORDS

Samarium

Terbium

Ions

Luminescence

Energy transfer

Glasses

Ultraviolet radiation

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