YAG:Ce<sup>3+</sup> Transparent Ceramic Phosphors Brighten the Next-Generation Laser-Driven Lighting.
basic_science · Level V
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- Record sourced from PubMed, PMID 32227397.
- Also identified by DOI 10.1002/adma.201907888.
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Abstract
Y<sub>3</sub> Al<sub>5</sub> O<sub>12</sub> :Ce<sup>3+</sup> (YAG:Ce<sup>3+</sup> ) transparent ceramic phosphors (TCPs) are regarded as the most promising luminescent converter for laser-driven (LD) lighting. High-quality YAG:Ce<sup>3+</sup> TCPs are still urgent for high efficiency LD lighting devices. YAG:Ce<sup>3+</sup> TCPs in a vacuum ambience by using nano-sized raw materials are prepared. Controlling defects by adding nano-sized MgO and SiO<sub>2</sub> simultaneously enables a high transmittance nearly 80%. After annealing in air furthermore, the luminous efficiency is enhanced greatly from 106 to 223 lm W<sup>-1</sup> , which is the best result reported now for LD lighting. These results demonstrate that the optimizing YAG:Ce<sup>3+</sup> TCPs in a fitting strategy will brighten once again in the next-generation LD lighting. Based on scanning electron microscopy (SEM) coupled with a cathodoluminescence system, defects and Ce<sup>3+</sup> distributions in grains are identified directly for the first time.