Abstract
The glass samples with composition TeO2–WO3–PbO–xEr2O3–yPr6O11 (x = 0,30%mol, y = 0,07%mol) were synthesized and studied with respect to the light emitting features. These glasses possess high photothermal stability and resistance against crystallization during reheating. The observed fluorescent spectra cover a wide visible spectral range. Due to simultaneous presence of both Er3+ and Pr3+ ions in the glass, nearly all absorption peaks are strongly overlapping. Careful analysis of the emission spectra allowed to assign all the observed peaks. From comparison of the Er3+ and Pr3+ ions’ energy level schemes, possible energy transfer processes were identified. The prepared glasses possess high quantum efficiency, which allow use them for white light emitting diodes.
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