Dual effect synergistically triggered Ce:(Y,Tb)3(Al,Mn)5O12 transparent ceramics enabling a high color-rendering index and excellent thermal stability for white LEDs

Ce:Y3Al5O12 transparent ceramics (TCs) with appropriate emission light proportion and high thermal stability are significant to construct white light emitting diode devices with excellent chromaticity parameters. In this work, strategies of controlling crystal-field splitting around Ce3+ ion and doping orange-red emitting ion, were adopted to fabricate Ce:(Y,Tb)(3)(Al,Mn)(5)O-12 TCs via vacuum sintering technique. Notably, 85.4 % of the room temperature luminescence intensity of the TC was retained at 150 degrees C, and the color rendering index was as high as 79.8. Furthermore, a 12 nm red shift and a 16.2 % increase of full width at half maximum were achieved owing to the synergistic effects of Tb3+ and Mn2+ ions. By combining TCs with a 460 nm blue chip, a warm white light with a low correlated color temperature of 4155 K was acquired. Meanwhile, the action mechanism of Tb3+ ion and the energy transfer between Ce3+ and Mn2+ ions were verified in prepared TCs.

Automated summary

In this study, strategies of controlling crystal-field splitting and ion doping were adopted to fabricate Ce:(Y,Tb)(3)(Al,Mn)(5)O-12 transparent ceramics with high thermal stability and excellent chromaticity parameters. The synergistic effects of Tb3+ and Mn2+ ions significantly improved the color rendering index and achieved a warm white light with low correlated color temperature. The action mechanism of Tb3+ ion and energy transfer between Ce3+ and Mn2+ ions in prepared TCs were verified.