Abstract
Eu2+-activated Ca2Y2Si2O9 phosphors with different Eu2+ concentrations have been prepared by a solid-state reaction method at high temperature and their photoluminescence (PL) properties were investigated. Photoluminescence results show that Eu2+-doped Ca2Y2Si2O9 can be efficiently excited by UV–visible light from 300 to 425 nm. Ca2Y2Si2O9: Eu2+ exhibits broad band emission in the wavelength range of 425–700 nm, due to the 4f65d1 ¿ 4f75d0 transition of the Eu2+ ions located at two different sites ((Ca/Y)1 and (Ca/Y)2) in Ca2Y2Si2O9. The effect of the Eu2+ concentration in Ca2Y2Si2O9 on the PL properties was investigated in detail. The results showed that the relative PL intensity reaches a maximum at 1 mol% of Eu2+, and a red-shift of the emission bands from these two different sites was observed with increasing Eu2+ concentration. Also there exists energy transfer between these two Eu2+ sites. The potential applications of Ca2Y2Si2O9: Eu2+ have been pointed out.
Original language | English |
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Pages (from-to) | 2040-2044 |
Number of pages | 5 |
Journal | Materials Research Bulletin |
Volume | 47 |
Issue number | 8 |
DOIs | |
Publication status | Published - 2012 |