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Improved luminescent properties of red-emitting Ca0.54Sr0.16Eu0.08Gd0.12(MoO4)0.2(WO4)0.8 phosphor for LED application by charge compensation |
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| Authors: | Yong Yan Yan-wen Tian |
| Affiliation: | a School of Materials Science and Engineering, Anhui University of Technology, Maanshan, Anhui 243002, PR China b Key Lab of Education Ministry for Metallurgical Engineering & Resources Recycling (Anhui University of Technology), Maanshan, Anhui 243002, PR China c School of Materials and Metallurgy, Northeastern University, Shenyang 110004, PR China |
| Abstract: | The red-emitting Ca0.54Sr0.16Eu0.08Gd0.12(MoO4)0.2(WO4)0.8 phosphor is improved in the emission charateristics by charge compensation, of which chromaticity coordinates (CIE) are x=0.66 and y=0.33. Three approaches to charge compensation are investigated, namely (a) 3Ca2+/Sr2+→2Eu3+/Gd3++vacancy, (b) 2Ca2+/Sr2+→Eu3+/Gd3++M+(M+ is a monovalent cation like Li+, Na+ and K+ employed as a charge compensator) and (c) Ca2+/Sr2+→Eu3+/Gd3++N− (N− is a monovalent anion like F−, Cl−, Br− and I− employed as charge compensation ions). Through photoluminescent spectra analyzing the radiative and non-radiative relaxation mechanisms of luminescent system are obtained. Under 20 mA forward-bias current, one red-emitting LED is made by combining 390-405 nm-emitting LED chip and the phosphor. The red-emitting phosphor has broad prospects in LED application field. |
| Keywords: | Charge compensators Charge compensation Red-emitting phosphors LED |
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