Abstract
The authors report on the correlation between the photoluminescence (PL) property and the SnO amount in SnO-ZnO-P2O5 (SZP) glass. In the PL excitation (PLE) spectra of the SZP glass containing Sn2+ emission center, two S1 states, one of which is strongly affected by SnO amount, are assumed to exist. The PLE band closely correlates with the optical band edge originating from Sn2+ species, and they both largely red-shifts with increasing amount of SnO. The emission decay time of the SZP glass decreased with increasing amount of SnO and the internal quantum efficiencies of the SZP glasses containing 1~5 mol% of SnO are comparable to that of MgWO4. It is expected that the composition-dependent S1 state (the lower energy excitation band) governs the quantum efficiency of the SZP glasses.
Highlights
White light emitting device using light emitting diode (LED) is strongly desired as a nextgeneration light source because of the low electrical power consumption, the long lifespan and so on
We have proposed a novel white LED device consisting of inorganic glass phosphor and LED source, and selected SnO-ZnO-P2O5 glass system as a potential candidate [1,2,3,4,5]
We examined the emission property of the SnO-ZnO-P2O5 glasses prepared by melt-quenching method, and reported that substitution of ZnO by SnO significantly affects the PL excitation (PLE) peak in the SnO-ZnO-P2O5 glasses [1]
Summary
White light emitting device using light emitting diode (LED) is strongly desired as a nextgeneration light source because of the low electrical power consumption, the long lifespan and so on. Received 11 Oct 2012; revised 6 Nov 2012; accepted 13 Nov 2012; published 20 Nov 2012 to emphasize that low-melting inorganic glass can be applied as sealant for high intensity and shorter wavelength excitation white LED. Based on such background, we have proposed a novel white LED device consisting of inorganic glass phosphor and LED source, and selected SnO-ZnO-P2O5 glass system as a potential candidate [1,2,3,4,5]. RE-free amorphous phosphors with high efficient and broad emission
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