Sodium Carbonate Flux Effects on the Luminescence Characteristics of (Y0.5Gd0.5)2O3:Eu Phosphor Particles Prepared by Spray Pyrolysis |
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Authors: | Yun Chan Kang Hyun Sook Roh Seung Bin Park |
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Affiliation: | Department of Chemical Engineering, Korea Advanced Institute of Science and Technology, Taejon 305-701, Korea |
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Abstract: | Na2CO3 flux was introduced in the preparation of phosphor particles by spray pyrolysis to improve the photoluminescence (PL) characteristics of (Y0.5Gd0.5)2O3:Eu phosphor particles. The phosphor particles directly prepared by spray pyrolysis at 1300°C from solutions with 20 wt% Na2CO3 flux had the highest PL intensity, which corresponded to 130% of that of particles prepared from solution without flux. On the other hand, the maximum PL intensity of the annealed particles, which were as-prepared at 900°C and posttreated at 1200°C for 3 h, was obtained from a solution with 5 wt% Na2CO3 flux. The maximum PL intensity of particles directly prepared by spray pyrolysis without posttreatment was 86% of that of posttreated phosphor particles. Na2CO3 flux was also important in control of morphology of (Y0.5Gd0.5)2O3:Eu phosphor particles. |
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Keywords: | luminescence spray pyrolysis carbonate |
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