Upconversion luminescence in transparent glass ceramics containing beta-PbF2 nanocrystals doped with erbium
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Data
2004-07-28
Autores
Neto, A. S.
da Costa, E. B.
Bueno, L. A.
Ribeiro, SJL
Título da Revista
ISSN da Revista
Título de Volume
Editor
Elsevier B.V.
Resumo
Frequency upconversion luminescence in erbium-doped PbGeO3-PbF2-CdF2-based transparent glass ceramics (TGC) under 980 nm infrared excitation is investigated. Upconversion emission signals around 410, 525, 550, 660, and 850 nm were generated and identified as due to the H-2(9/2) H-2(11/2), S-4(3/2), and F-4(9/2) transitions to the I-4(15/2) ground-state, and S-4(3/2)-I-4(13/2), respectively. The erbium ions excited-state emitting levels were populated via a combination of stepwise ground-state absorption (GSA), excited-state absorption (ESA), and cross-relaxation processes. The results also disclosed that both blue (410 nm) and red (660 nm) upconversion emission signals in the transparent glass ceramic sample presented twice as much intensity as compared to its vitreous counterpart. (C) 2003 Elsevier B.V. All rights reserved.
Descrição
Palavras-chave
upconversion, vitroceramics, rare-earth, luminescence
Como citar
Journal of Alloys and Compounds. Lausanne: Elsevier B.V. Sa, v. 375, n. 1-2, p. 224-228, 2004.