THE PHYSICAL AND LUMINESCENT PROPERTIES OF DY3+ DOPED PHOSPHATE GLASSES FOR SOLID STATES LIGHTING APPLICATIONS
Keywords:
Phosphate glass, JO theory, transition probability, branching ratioAbstract
Oxyfluoride phosphate glass samples doped with Dy3+ ions were prepared by melt quenching technique and study through physical, optical and luminescent characterization. The density and refractive index increase with Dy2O3 concentration while molar volume decreases. The UV-Vis-NIR absorption spectra were recorded in the 200 to 2,000 nm wavelength range. Eight clear absorption peaks were observed in UV-Vis-NIR spectra. Photoluminescence excitation and emission spectra have been recorded under 573 and 350 nm wavelength respectively. The intensity of the peaks in the excitation and emission spectra increase with increasing concentration of Dy3+ ions up to 1mol% and then decrease. The JO theory is applied to find the JO intensity parameters Ωλ(λ=2,4,6) and radiative properties JO intensity Parameters show Ω2>Ω4 Ω6 trend. The. The decay time, CIE coordinates and CCT values were also investigated.
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