Abstract
We reported on a new white light emission phosphor from γ-irradiated Ag/Eu co-doped phosphate glass 65NaPO3–30Al (PO3)3–5SiO2. Absorption and EPR results confirm the appearance of Eu2+ and silver aggregates (Ag2+ and Ag32+) after γ-irradiation. Ag2+ and Ag32+ show strong absorption in near ultra-violet (NUV) range with a maximum at 320 and 370nm, respectively. Energy transfers of silver aggregates→Eu2+, silver aggregates→Eu3+ and Eu2+→Eu3+ greatly enhanced luminescence intensity of Eu2+ and Eu3+ after γ-irradiation. The white light emission can be tuned simply by changing excitation wavelength. Pure white light emission close to standard white light (x=0.333, y=0.333) in CIE chromaticity diagram was obtained under 337–385nm excitation. Pure white emission, broad excitation bands and easy fabrication suggest its potential application in white LEDs.
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