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http://dx.doi.org/10.3740/MRSK.2005.15.6.408

Effect of NH4F Flux on the Characteristics of Barium Strontium Silicate Phosphor Particles  

Kang Hee Sang (Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology)
Koo Hye Young (Department of Chemical Engineering, Konkuk University)
Jung Dae Soo (Department of Chemical Engineering, Konkuk University)
Ju Seo Hee (Department of Chemical Engineering, Konkuk University)
Hong Seung Kwon (Department of Chemical Engineering, Konkuk University)
Kang Yun Chan (Department of Chemical Engineering, Konkuk University)
Jung Kyeong Youl (Advanced Materials Division, Korea Research Institute of Chemical Technology)
Park Seung Bin (Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology)
Publication Information
Korean Journal of Materials Research / v.15, no.6, 2005 , pp. 408-412 More about this Journal
Abstract
[ $Ba_{1.5}Sr_{0.5}SiO_4:Eu$ ] phosphor particles with high photoluminescence intensity under long wavelength ultraviolet were prepared by spray pyrolysis. We investigated the effect of $NH_4F$ flux added into starting solution on the morphology and photoluminescence intensity of $Ba_{1.5}Sr_{0.5}SiO_4:Eu$ phosphor prepared by spray pyrolysis. $Ba_{1.5}Sr_{0.5}SiO_4:Eu$ phosphor particles prepared from starting solution containing $NH_4F$ flux had the maximum photoluminescence intensity at the post-treatment temperature of $1200^{\circ}C$ and the maximum photoluminescence intensity of $Ba_{1.5}Sr_{0.5}SiO_4:Eu$ phosphor particles prepared from the starting solution containing $NH_4F$ flux was $137\%$ of that of the phosphor particles prepared from the starting solution without flux material. $Ba_{1.5}Sr_{0.5}SiO_4:Eu$ phosphor particles prepared from starting solution containing $NH_4F$ flux had larger size and more aggregated morphology than those prepared from starting solution without flux material. The photoluminescence intensity of $Ba_{1.5}Sr_{0.5}SiO_4:Eu$ phosphor particles prepared from starting solution containing $NH_4F$ flux above $3wt.\%$ had high photoluminescence intensities. The addition amount of $NH_4F$ flux showing the maximum photoluminescence intensity was $12wt.\%$. The optimum amount of $NH_4F$ flux was $5wt.\%$ when we considered the morphological and photoluminescence characteristics of $Ba_{1.5}Sr_{0.5}SiO_4:Eu$ ohosphor particles prepared by spray pyrolysis.
Keywords
phosphor; spray pyrolysis; LED; flux;
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