Jian Li,Jia-chun Deng,Qi-fei Lu,Da-jian Wang.Direct white-light from core-shell-like sphere with Sr3Mg-Si2O8: Eu2+, Mn2+ coated on Sr2SiO4:Eu2+[J].Optoelectronics Letters,2013,9(4):293-296 Direct white-light from core-shell-like sphere with Sr3Mg-Si2O8: Eu2+, Mn2+ coated on Sr2SiO4:Eu2+ Author Name Affiliation E-mail Jian Li  Key Lab. of Display Materials & Photoelectronic Devices, Ministry of Education, Tianjin University of Technology, Tianjin, 300384, China School of Science, Tianjin University of Technology, Tianjin, 300384, China Institute of Materials Physics, Tianjin University of Technology, Tianjin, 300384, China    Jia-chun Deng  Key Lab. of Display Materials & Photoelectronic Devices, Ministry of Education, Tianjin University of Technology, Tianjin, 300384, China School of Science, Tianjin University of Technology, Tianjin, 300384, China Institute of Materials Physics, Tianjin University of Technology, Tianjin, 300384, China  jcdeng@tjut.edu.cn  Qi-fei Lu  Key Lab. of Display Materials & Photoelectronic Devices, Ministry of Education, Tianjin University of Technology, Tianjin, 300384, China School of Science, Tianjin University of Technology, Tianjin, 300384, China Institute of Materials Physics, Tianjin University of Technology, Tianjin, 300384, China    Da-jian Wang  Key Lab. of Display Materials & Photoelectronic Devices, Ministry of Education, Tianjin University of Technology, Tianjin, 300384, China School of Science, Tianjin University of Technology, Tianjin, 300384, China Institute of Materials Physics, Tianjin University of Technology, Tianjin, 300384, China  djwang@tjut.edu.cn  Abstract:       A method of color mixture for white light is presented with Sr3MgSi2O8:Eu2+, Mn2+ shell coated on Sr2SiO4:Eu2+ core by spray pyrolysis procedure. Upon near ultraviolet (NUV) excitation, a 550 nm band emission of Eu2+ from core host combines with the simultaneous emissions of Eu2+ at 457 nm and Mn2+ at 683 nm based on energy transfer in the shell lattice to generate warm white light with color rendering index (CRI) of 91. With such a core-shell-like structure, the re-absorption of blue light from shell layer can be effectively suppressed, and the chemical stability of the phosphor is verified experimentally to be superior to that of the Sr2SiO4:Eu2+. This new proposed phosphor provides great potential in the color mixture of blending-free phosphor converted white NUV light emitting diode (LED) devices. Hits: 4224 Download times: 90 View Full Text    Download reader