White light generation from Dy3+ doped tellurite glass

• Published in: Journal of quantitative spectroscopy & radiative transfer Vol. 134; pp. 55 - 63
• Main Authors: Damak, Kamel, Yousef, El Sayed, Rüssel, Christian, Maâlej, Ramzi
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.02.2014
• Subjects: Absorption spectra; Differential thermal analysis; Dy2O3; Energy gaps (solid state); Excitation; Glass; Luminescence; Mathematical analysis; Rare earth metals; Spectroscopic Properties; Tellurite glass; White light; White light generation; Tellurite glass; White light generation; Spectroscopic Properties; Dy2O3; Luminescence
• ISSN: 0022-4073; 1879-1352
• DOI: 10.1016/j.jqsrt.2013.10.013

This paper reports on the spectral results of Dy3+ (1.0mol%) ions-doped TeO2–ZnO–PbO–PbF2–Na2O (TZPPN) glass. Raman spectrum measurements, differential thermal analysis (DTA) profiles of this rare-earth ion-doped glass were carried out. From the DTA thermogram, glass transition (Tg), crystallization (Tc) and melting (Tm) temperatures were evaluated. Direct and indirect optical band gaps were calculated based on the glasses UV absorption spectra. From the absorption spectra, Judd–Ofelt (J–O) intensity parameters, Ωk, were calculated. Using J–O intensity parameters, several radiative properties such as spontaneous transition probabilities (AR), radiative branching ratios (βR) and radiative lifetimes (τR) were determined for the excitation level 4F9/2. From the emission spectra, a strong yellow emission at 574nm (4F9/2→6H13/2) was observed and it also showed a combination of blue and red emission bands for this glass. The stimulated emission cross-section σ(λp) was also evaluated for the 4F9/2→6HJ (J=11/2, 13/2, and 15/2) transitions. This study indicates that 1mol% Dy2O3-doped tellurite glass can be considered for white light generation with the excitation of blue light (454nm). •This glass has a high thermal stability (ΔT=164°C), which can be used in optical application.•The value of σ(λp) for the 4F9/2→6H13/2 transition is higher and it is equal to 40.7×1022cm2.•The luminescence quantum efficiency η for the 4F9/2 level of Dy3+ ions is found to be 90%.•The prepared glass can be used for white light generation with the excitation of blue light (454nm).