Mn2+ activated MgAlON transparent ceramic: A new green-emitting transparent ceramic phosphor for high-power white LED |
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| Affiliation: | 1. College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China;2. State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China;1. School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China;2. Key Laboratory of Transparent Opto-functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;3. Shanghai Normal University, Shanghai 200234, China;1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. Henan Rongjin High Temperature Materials Co., Ltd., Weihui, Henan Province 453100, China;3. School of Architecture and Construction, Hebei University of Architecture, Hebei Province 075000, China |
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| Abstract: | A novel Mn2+ activated green-emitting MgAlON transparent ceramic phosphor was synthesized from Mg0.21Al2.57O3.80N0.20:0.03Mn2+ (MgAlON:Mn) phosphor powder by pressureless sintering combining with hot isostatic pressing. By crystalline structure refinement and cathodoluminescence (CL) characterization, it is demonstrated that Mn2+ was dissolved in the spinel lattice and occupied the tetrahedral site. The ceramic, retaining high transmittance in UV–vis region (up to 82% at 800 nm) and excellent thermal-mechanical properties of MgAlON transparent ceramic-matrix, shows a strong green emission at 513 nm under 445 nm light excitation. Compared with its powder counterpart, the ceramic phosphor exhibits higher green color purity, higher internal quantum efficiency (47%) and lower thermal quenching. It is suggested that this novel green solid phosphor could be applied in high color rendering and high-power white light-emitting diodes when combined with a red solid phosphor and a blue LED chip. |
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| Keywords: | MgAlON Transparent ceramic Green-emitting Photoluminescence |
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