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Photoluminescence Characteristics of (Ca, Sr)2MgSi2O7:Eu2+ Phosphor Particles Prepared by Spray Pyrolysis  

Lee, Ho Min (Department of Advanced Materials Engineering, Korea University)
Jung, Kyeong Youl (Department of Chemical Engineering, Kongju National University)
Jung, Ha-Kyun (Advanced Materials Division, Korea Research Institute of Chemical Technology)
Lee, Jong Heun (Department of Advanced Materials Engineering, Korea University)
Publication Information
Korean Chemical Engineering Research / v.44, no.3, 2006 , pp. 284-288 More about this Journal
Abstract
$(Ca,Sr)_{2-y}MgSi_2O_7:Eu^{2+}{_y}$ (CMS) phosphor particles were prepared by using a spray pyrolysis process. The luminescent property was optimized by changing the content of Eu and the post-treatment temperature. The luminescence characteristics were also monitored with changing the ratio of Ca to Sr. The pure tetragonal $Ca_2MgSi_2O_7$ or $Sr_2MgSi_2O_7$ particles were obtained when the post-treatment temperature was over $1,000^{\circ}C$. The highest emission intensity of CMS particles were achieved when the concentration (y) of Eu and the treatment temperature were 0.05 and $1,250^{\circ}C$,respectively. The emission wavelength $({\lambda}_{max})$ of ${(Ca_{1-x},Sr_x)}_{1.95}MgSi_2O_7:{Eu^{2+}}_{0.05}$ was gradually shifted from 524 nm to 456 nm with increasing the content of Sr due to the reduction of crystal field strength. The emission intensity and its width of $Sr_2MgSi_2O_7:Eu$ was greatly enhanced by substituting Ca of less than 10 mol％ for Sr without any significant peak shift. The morphology of as-prepared particles was spherical, but changed to irregular-shaped one after the post treatment at the temperature range from 900 at $1,300^{\circ}C$.
Keywords
Phosphor; Spray Pyrolysis; Light Emitting Diode; Silicate;
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