Journal
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
Volume 4, Issue 2, Pages 137-142Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1016/S1468-6996(03)00025-1
Keywords
Red-emitting phosphor; Phosphorescence; Manganese ions; Germanate compounds; Point defect; Photo-oxidation
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Funding
- Japan Society for the Promotion of Science [14103009]
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Red phosphorescence properties on Mn ions doped MgO-GeO2 compounds, Mg4GeO6, Mg2GeO4, and MgGeO3, were investigated. The red phosphorescence was observed in MgGeO3: Mn2+. The red phosphorescence intensity of MgGeO3: Mn2+ increased with adding the MgF2 and Yb2O3. The red phosphorescence duration time of sample with a batch composition of 44 mol%-MgO, 6 mol%-MgF2, 50 mol%-GeO2, 0.1 mol%-MnO, and 0.05 mol%-Yb2O3 is approximately 30 min. The mechanism of red phosphorescence in MgGeO3: Mn2+ is discussed in terms of the relationship between valency state of manganese ions and point defects in matrix compound. (C) 2003 Elsevier Science Ltd. All rights reserved.
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