Lasing potentialities and white light generation capabilities of Dy super(3+) doped oxy-fluoroborate glasses

Oxy-fluoroborate (OFB) glasses doped with different concentrations of Dy super(3+) ions were synthesized through melt quenching technique and characterized by using optical absorption, photoluminescence and decay analysis to understand the lasing potentialities and their utility for white light emit...

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Bibliographic Details
Published in:Journal of luminescence 2014-09, Vol.153, p.382-392
Main Authors: Mahamuda, Sk, Swapna, K, Packiyaraj, P, Rao, ASrinivasa, Prakash, GVijaya
Format: Article
Language:English
Subjects:
Chromaticity
Decay
Emission
Glass
Lasing
Photoluminescence
Stimulated emission
White light
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Summary:Oxy-fluoroborate (OFB) glasses doped with different concentrations of Dy super(3+) ions were synthesized through melt quenching technique and characterized by using optical absorption, photoluminescence and decay analysis to understand the lasing potentialities and their utility for white light emitting diodes (LEDs). The XRD spectrum recorded for undoped OFB glass confirms the amorphous nature of the prepared glasses. Judd-Ofelt theory has been applied to the recorded absorption spectra to measure the radiative properties such as transition probability (A sub(R)), radiative lifetimes ( tau sub(R)), branching ratios ( beta sub(R) beta R) and spectroscopic quality factor ( chi ) for the prominent fluorescent levels. The emission spectra recorded for these glasses gives four emission transitions super(4)F sub(9/2) arrow right super(6)H sub(15/2), super(6)H sub(13/2), super(6)H sub(11/2) and super(6)H sub(9/2) for which effective band widths ( Delta lambda sub(P) Delta lambda P), experimental branching ratios ( beta sub(exp) beta exp) and stimulated emission cross-sections ( sigma sub(se) sigma se) are evaluated. To know the lasing potentialities of these glasses, the quantum efficiency ( eta eta ) of these glasses are measured by recording the decay curves for the prominent emission levels super(4)F sub(9/2) arrow right super(6)H sub(15/2) and super(4)F sub(9/2) arrow right super(6)H sub(13/2). Among the observed emission transitions, a transition at 575 nm ( super(4)F sub(9/2) arrow right super(6)H sub(13/2)) indicates the lasing potentialities. The CIE chromaticity co-ordinates and the confocal photoluminescence images of these glasses further suggests the near white light generation capabilities in principle.
ISSN:0022-2313
DOI:10.1016/j.jlumin.2014.03.009