Luminescence Properties and Application of Ce3+Doped Ba3 Y2(BO3)4 Phosphor
Ce3+doped Ba3Y2(BO3)4 phosphors were synthesized by the solid-state reaction technique.The crystal structure was analyzed by the X-ray diffraction patterns.The photoluminescence excitation and emission spectra,photoluminescence decay curves,the CIE coordinates and temperature dependent emission spectra were studied.The bright blue emission of Ba3Y2(BO3)4∶Ce3+phosphors peaks around 420 nm was observed under the UV excita-tion,the full width at half maximum is over 83 nm.The integrated luminescence intensities increase first and then decrease with increasing Ce3+concentration.The CIE coordinates of the samples with the increasing of Ce3+concen-tration change slightly,indicating that the color stability of the samples was excellent.With the temperature increas-ing the emission intensity of samples decreased,the thermal stability of the sample needs to be improved.A white LED was fabricated by using a 365 nm LED chip combined with Ba3Y2(BO3)4∶Ce3+phosphor and commercial phos-phor,the CIE was(0.33,0.39),CCT was 5 570 K,and Ra was 92.6.These results indicated that Ba3Y2(BO3)4∶Ce3+phosphor could be as a blue broad emission band LED phosphor.
万方数据
