Effects of composition and transparency on photo and radioluminescence of Y2O3:Eu complexes

Autor: Tai T. Pham, A. Alipour Skandani, C. C. Luhrs, Mohamed S. El-Genk, Marwan Al-Haik
Rok vydání: 2011
Předmět:
Zdroj: Radiation Effects and Defects in Solids. 166:501-512
ISSN: 1029-4953
1042-0150
DOI: 10.1080/10420150.2011.569720
Popis: A solid state-based method using a hot reaction chamber is applied to the synthesis of Y2O3:Eu particles containing Eu from 0 to 5 mol%. The produced powders are studied using X-ray diffraction (XRD), scanning electron microscopy and transmission electron microscopy (TEM), as well as photoluminescence (PL) and radioluminescence tests. TEM and XRD results revealed the powder to be mono-disperse and in the form of a solid solution. The PL of Y2O3:Eu powder depends on both the concentration quenching effect (due to an excess of Eu concentration) and the surface luminescence effect (depicted by a higher surface area induced by the large phosphor concentration in the solution or smaller particle sizes). A 22Na gamma source is used to compare the recorded count rates for four Y2O3:Eu scintillator materials with different concentrations of Eu. Each scintillator composition is examined in four forms: solid pellets with a high volume porosity and three aqueous solutions of Y2O3:Eu particles of the different scinti...
Databáze: OpenAIRE
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