Characteristics of Halophosphate Phosphor for Long-wavelength UV Prepared by Spray Pyrolysis

Abstract

Blue-emitting <TEX>$Sr_{10}$</TEX>(<TEX>$PO$</TEX>)<TEX>$_{6}$</TEX> <TEX>$Cl_2$</TEX>:<TEX>$Eu^{2+}$</TEX> and <TEX>$_{(Sr,Mg) }$</TEX> 10/(<TEX>$PO_4$</TEX>)<TEX>$_{6}$</TEX> <TEX>$Cl_2$</TEX>:<TEX>$Eu^{2+}$</TEX> phosphor particles for application of long-wavelength UV LED were prepared by ultrasonic spray pyrolysis. The luminescence characteristics under long- wave-length ultraviolet of the <TEX>$Sr_{10}$</TEX> (<TEX>$PO_4$</TEX>)<TEX>$_{6}$</TEX> <TEX>$Cl_2$</TEX>:<TEX>$Eu^{2+}$</TEX> and (Sr,Mg)<TEX>$_{10}$</TEX> (<TEX>$PO_4$</TEX>)<TEX>$_{6}$</TEX> <TEX>$Cl_2$</TEX>:<TEX>$^Eu{2+}$</TEX> phosphor particles prepared by the spray pyrolysis were compared with that of the commercial product. The PL intensity of the <TEX>$Sr_{10}$</TEX> (<TEX>$PO_4$</TEX>)<TEX>$_{6}$</TEX> <TEX>$Cl_2$</TEX>:<TEX>$Eu^{2+}$</TEX> particles prepared by the spray pyrolysis was lower than that of the commercial <TEX>$Sr_{10}$</TEX> (<TEX>$PO_4$</TEX>)<TEX>$_{6}$</TEX> <TEX>$Cl_2$</TEX>:<TEX>$Eu^{2+}$</TEX> particles because prepared <TEX>$Sr_{10}$</TEX> (<TEX>$PO_4$</TEX>)<TEX>$_{6}$</TEX> <TEX>$Cl_2$</TEX>:<TEX>$Eu^{2+}$</TEX> phosphor particles had porous structure and hollow morphology. However, the PL intensity of the (Sr,Mg)<TEX>$_{10}$</TEX>(<TEX>$PO_4$</TEX>)<TEX>$_{6}$</TEX> <TEX>$Cl_2$</TEX>:<TEX>$Eu^{2+}$</TEX> phosphor particles prepared by the spray pyrolysis was 8% higher than that of the commercial one. The high brightness of <TEX>$(Sr,Mg)_{10}$</TEX> (<TEX>$PO_4$</TEX>)<TEX>$_{6}$</TEX> <TEX>$Cl_2$</TEX>:Eu<TEX>$^{2+}$</TEX> phosphor particles prepared by spray pyrolysis is due to the dense structure and high crystallinity of particles. The TEX>$(Sr,Mg)<_{10}$</TEX> (<TEX>$PO_4$</TEX>)<TEX>$_{6}$</TEX> /<TEX>$Cl_2$</TEX>:<TEX>$Eu^{ 2+}$</TEX> phosphor particles had main emission peak t 448 nm under long- wavelength ultraviolet.