Abstract
SnO2:Eu powder phosphor was examined concerning to its synthesis, physcochemical properties and luminescent characteristics for the purpose of practical use in low-energy-election excitation. The oxalate coprecipitate of Sn and Eu composed of large particles with clear crystal facets was found to give bright SnO2:Eu powder phosphor. The solubility limit of Eu into SnO2 was 0.05∼0.06 at.%, and smaller mean diameter, higher resistivity (order of 106Ω·cm) and more intensive diffused reflectance were observed with increasing Eu addition.Although the same emission spectra by f-f transition (5D0-7F1 main emission) were observed in UV, high and low-energy-electron excitation, the intrinsic emission from SnO2 matrix was different in each excitation method. The Optimum addition of 0.1 at.% Eu, 5.9msec decay (1/10), and the efficiency of 2lm/W at 9-10V were obtained at low-energy-electron excitation. Efficiency increased at lower voltage and current excitation due to sublinearities of brightness-voltage and current dependences.
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