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Interphase layers luminescent probing in bismuth-containing phosphate-molybdate glass-ceramics
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DOI：10.1016/j.jnoncrysol.2026.124086.png)
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Abstract
En 中文
Two types of glass-ceramics prepared by adding the micro/nanoscale powders of luminescent crystalline EuPO4 and KBi(MoO4)2:Eu fillers to the pre-manufactured glass of 27.18P2O5-36.24MoO3-31.71K2O-4.86Bi2O3 composition have been studied. An additional glass was prepared by incorporating 0.1 wt. % Eu2O3 into the glass of composition above, and it was used for a proper comparison of the spectral characteristics of the glass and the composites. All samples were characterized using scanning electron microscopy (SEM), X-ray diffraction phase analysis (XRD), diffuse light reflectance (DR), and photoluminescence (PL) spectroscopy. SEM, XRD, and hardness measurements showed the presence of the noted crystalline fillers in the composition of the glass-ceramics. Electronic band gaps, evaluated from the DR data, are in the 3.6-3.72 eV (direct) and 2.94-3.12 eV energy ranges (indirect). In addition to luminescence of the glass and filler crystallites, the PL spectra of glass-ceramics reveal specific details attributed to the emission of Eu3+ ions located in the intermediate regions (interphase layers) between the crystallites and the glass matrix. The color characteristics of the samples (color coordinates, correlated color temperature, and color purity) can be tuned by varying the type and content of crystalline fillers, thereby confirming the potential application of the studied materials as luminescent transformers in WLEDs.
Keywords:
Oxide glass
Glass-ceramics
Interphase
RE ions
Luminescence
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