Erbium-to-dysprosium energy-transfer mechanism and visible luminescence in lead-cadmium-fluorogermanate glass excited at 405 nm

[Display omitted] •Observation and evaluation of Er-to-Dy energy-transfer in glass.•Generation of tunable light of low CCT.•New glassy host for LED-based white light emitting phosphor. Erbium-to-dysprosium energy-transfer and visible luminescence in the blue, green, yellow, red, and NIR is reported...

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Bibliographic Details
Published in:Chemical physics letters 2019-05, Vol.723, p.28-32
Main Authors: Sousa, J.F., Alves, R.T., Rego-Filho, F.G., Gouveia-Neto, A.S.
Format: Article
Language:English
Subjects:
Energy-transfer
Glass
Rare-earth
Visible-light
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Summary:[Display omitted] •Observation and evaluation of Er-to-Dy energy-transfer in glass.•Generation of tunable light of low CCT.•New glassy host for LED-based white light emitting phosphor. Erbium-to-dysprosium energy-transfer and visible luminescence in the blue, green, yellow, red, and NIR is reported in PbGeO3:PbF2:CdF2 glass under 405 nm excitation. Absorption and excitation spectra were examined in the UV–VIS-IR spectral region. Emission showed a decrease in the Er3+ emissions around 520 and 545 nm when Dy3+ was added to the host matrix, while the Dy3+ emission around 576 nm (4F9/2 – 6H13/2) increased concomitantly. The recorded lifetime for Er3+ emissions also decreased, as Dy3+ concentration was increased for fixed Er3+ content. No similar behavior was observed when Er3+ concentration varied, confirming a one-way Er3+-to-Dy3+ energy transfer mechanism.
ISSN:0009-2614
1873-4448
DOI:10.1016/j.cplett.2019.03.017