UV and VUV characteristics of (YGd)2O3:Eu phosphor particles prepared by spray pyrolysis from polymeric precursors |
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Authors: | EJ Kim YC Kang HD ParkSK Ryu |
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Affiliation: | a Advanced Materials Division, Korea Research Institute of Chemical Technology, P.O. Box 107, Yuseong-gu, Daejeon 305-600, South Korea b Department of Chemical Engineering, Chungnam National University, 220 Gung-dong, Yuseong-gu, Daejeon 305-764, South Korea |
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Abstract: | Red-emitting (YGd)2O3:Eu phosphor particles, with high luminescence efficiency under vacuum ultraviolet (VUV) and ultraviolet (UV) excitation, were prepared by a large-scale spray pyrolysis process. To control the morphology of phosphor particles under severe preparation conditions, spray solution with polymeric precursors were introduced in spray pyrolysis. The prepared (YGd)2O3:Eu phosphor particles had spherical shape and filled morphology even after post-treatment irrespective of Gd/Y ratio. In the case of solution with polymeric precursors, long polymeric chains formed by esterification reaction in a hot tubular reactor; the droplets turned into viscous gel, which retarded the precipitation of nitrate salts and promoted the volume precipitation of droplets. The brightness of (YGd)2O3:Eu phosphor particles increased with increasing gadolinium content, and the Gd2O3:Eu phosphor had the highest luminescence intensity under UV and VUV excitation. The maximum peak intensity of Gd2O3:Eu phosphor particles under UV and VUV were 118 and 110% of the commercial Y2O3:Eu phosphor particles, respectively. |
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Keywords: | Optical materials Ceramics Luminescence |
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