Ce/Mn/Cr: Y3Al5O12 phosphor ceramics for white LED and LD lighting with a high color rendering index |
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| Affiliation: | 1. Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 1219 West Zhongguan Road, Ningbo, 315201, China;2. University of Nottingham Ningbo China, 199 Taikang East Road, Ningbo, 315201, China;3. Engineering Research Center of Optical Instrument and System, Ministry of Education and Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology, No. 516 Jungong Road, Shanghai, 200093, China |
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| Abstract: | Ce/Mn/Cr: Y3Al5O12 transparent ceramics with a pure garnet structure and a high color rendering index were prepared by a solid-state reaction method. Mn2+ and Cr3+ enhance the emission between 500 and 700 nm and expand the conventional Ce: YAG phosphors spectrum. The Ce3+ can work both, as activators and sensitizers, and the intense energy transfer from Ce3+ to Mn2+/Cr3+ is realized through the non-radiative and radiative processes. In the sample with the optimized doping concentration the high color rendering index (CRI) value of 75.3 can be achieved under a 450 nm laser diode excitation. The chromaticity coordinates can be tuned from (0.3125, 0.3232) to (0.2917,0.2851) by varying the doping concentration. With the increasing Mn2+/Cr3+ doping concentration, the lifetime of Ce3+, quantum efficiency and luminous efficiency are all gradually decreased. This work effectively offers a scheme for realizing the high color rendering performance of phosphor-converted transparent ceramics in white LEDs/LDs. |
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| Keywords: | Transparent ceramics Laser lighting Red light CRI Ce/Mn/Cr YAG |
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