Journal
OPTICAL MATERIALS
Volume 35, Issue 5, Pages 1013-1018Publisher
ELSEVIER
DOI: 10.1016/j.optmat.2012.12.014
Keywords
Silicate phosphor; White light emitting diodes; Rare earth
Categories
Funding
- National Basic Research Program of China (973 Program) [2007CB935502]
- National Natural Science Foundation of China [20771098]
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Single-phased Ca3Si2O7:Ce3+,Eu2+ phosphor has been successfully prepared by the high temperature solid-state method. The phosphor shows efficient excitation bands from 200 to 400 nm and adjustable emission bands through the energy transfer from the Ce3+ to Eu2+ ions. The color hues can change from blue towards white ultimately to orange by adjusting the percentage content of doping ions. The investigation reveals that an electric dipole-dipole reaction mechanism should be responsible for the energy transfer from the Ce3+ to Eu2+ ions. The critical distance was obtained from the spectral overlap in terms of Dexter's theory. The developed phosphor Ca3Si2O7:Ce3+,Eu2+ exhibits two bands at 440 and 625 nm, respectively, which reveling that it has a great potentiality to be an UV-convertible phosphor for white-light emitting diodes with low color temperature. Crown Copyright (C) 2013 Published by Elsevier B.V. All rights reserved.
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