Ultra-Narrowband Green-Emitting Transparent Composite Ceramics for Laser-Driven Display.
basic_science · Level V
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- Record sourced from PubMed, PMID 39703033.
- Also identified by DOI 10.1002/adma.202414957.
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Abstract
Laser-driven projection displays face a critical challenge in developing laser-excitable and high-performance narrowband green emitters. Herein, new Al<sub>2</sub>O<sub>3</sub>-LaMgAl<sub>11</sub>O<sub>19</sub>: Mn<sup>2+</sup> (Al<sub>2</sub>O<sub>3</sub>-LMA: Mn<sup>2+</sup>) transparent composite ceramics are reported via high-temperature vacuum sintering, which produces a high-color-purity (95.4%) green emission with full width at half maximum of 24 nm and superior thermal and moisture and laser irradiation stability. These are attributed to low electron-phonon couple, weak crystal-field effect, an individual lattice location of Mn<sup>2+</sup> activators in high structural rigid host, and the incorporation of a high-thermal-conductivity Al<sub>2</sub>O<sub>3</sub> secondary phase. As a result, the composite ceramics are demonstrated as an attractive color converter with a high external quantum efficiency (38%) and absorption coefficient (53%), which ensures a luminous flux of 2012 lm @40.0 W, a luminous efficacy of 67.7 lm W<sup>-1</sup>, and a green light conversion efficiency of 20.3% upon blue laser irradiation. This enables to construct a brand-new laser-driven prototype display with a record color gamut beyond Rec.2020 standard (100.8%), outperforming commercial YAG: Ce<sup>3+</sup> and β-SiAlON: Eu<sup>2+</sup>. This exploration in ultra-narrowband green luminescent materials is poised to accelerate the development of "ideal displays" for laser-driven projection display technology.