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Chao K.-F.,Inner Mongolia Normal University | Chao K.-F.,Dalian Luminglighting Science and Technology CO. | Na R.-S.,Inner Mongolia Normal University | Sang S.-Y.,Dalian Luminglighting Science and Technology CO. | And 2 more authors.
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2011

YAG:Ce phosphors coated with ZnO nanoparticles were prepared based on a liquid chemical method in ethanol solution at low temperature. The level of the luminescence of ZnO@YAG was studied with different concentrations of acetic zinc, and the surface morphology was characterized by Scanning Electron Microscopy(SEM). The room-temperature photoluminescence were analyzed. Results show that the surface of the YAG:Ce is coated with 25 nm of ZnO nanoparticles. Photoluminescence brightness of the coating phoshors increases by a maximum at 12% compared with that of the uncoated YAG:Ce phosphors. The enhancement of photoluminescence brightness depends on the concentration of coating nano ZnO. Finally, ZnO@YAG were used for white LED package, the luminescent intensity increases 6.8 percent and phosphor usage decreases 1 percent. It is significant for lighting products that can improve the intensity of white LEDs and decrease the cost of package. Source


Chao K.F.,Dalian University of Technology | Chao K.F.,Dalian Luminglighting Science and Technology CO. | Xiao Z.G.,Dalian Luminglighting Science and Technology CO. | Zhang H.W.,Dalian Luminglighting Science and Technology CO. | And 7 more authors.
Materials Science Forum | Year: 2011

In this work, YAG: Ce phosphors coated with ZnO nanoparticles were prepared based on the wet chemical method in ethanol solution at low temperature. The surface character was characterized by XPS and SEM. The XPS spectra showed that the peak positions corresponding to the Zn 2p3/2, Zn 2p1/2 and O 1s are 1022.08 eV, 1044.88 eV and 530. 8 eV, respectively. The SEM images showed that the surface of YAG:Ce were coated with ZnO nanoparticles. The thickness is about 25 nm. The luminescence properties of YAG:Ce phosphors coated with ZnO nanoparticles were studied. It is found that the photoluminescence intensity of coated phoshors increases a maximum at 12% compared with that of the uncoaed YAG: Ce phosphors and the enhancement of photoluminescence intensity depends on the consistency of ZnO nanoparticles. Finally, the YAG: Ce phosphors coated with ZnO nanoparticles were used for LED package. The results show that the luminescent intensity increases 6.8 % and the quantity of phosphors decreases 1 %. It is important for the lighting product to improve the luminescence intensity of white LED and decrease the cost of package. © (2011) Trans Tech Publications. Source

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