Ultra‐Narrowband Green‐Emitting Transparent Composite Ceramics for Laser‐Driven Display,Advanced Materials

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Ultra‐Narrowband Green‐Emitting Transparent Composite Ceramics for Laser‐Driven Display
Advanced Materials ( IF 27.4 ) Pub Date : 2024-12-20 , DOI: 10.1002/adma.202414957
Dahai Hu, Shisheng Lin, Tao Pang, Lingwei Zeng, Guoyu Xi, Fengluan You, TianShuo Wu, Xiaoshuang Li, Bo Wang, Lei Lei, Feng Huang, Daqin Chen

Laser‐driven projection displays face a critical challenge in developing laser‐excitable and high‐performance narrowband green emitters. Herein, new Al2O3‐LaMgAl11O19: Mn2+ (Al2O3‐LMA: Mn2+) 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 Mn2+ activators in high structural rigid host, and the incorporation of a high‐thermal‐conductivity Al2O3 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−1, 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: Ce3+ and β‐SiAlON: Eu2+. This exploration in ultra‐narrowband green luminescent materials is poised to accelerate the development of “ideal displays” for laser‐driven projection display technology.

更新日期：2024-12-20

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