The development of extra-broadband visible emission phosphors is crucial to achieve next-generation illumination with better color experience.Herein,a defect engineering strategy mediated by the structural cationic su...The development of extra-broadband visible emission phosphors is crucial to achieve next-generation illumination with better color experience.Herein,a defect engineering strategy mediated by the structural cationic substitution is proposed and experimentally demonstrated for specific ultra-broadband emission in a garnet phosphor.The induced oxygen vacancies and interstitial cation through lattice distortion break the periodic potential field of the crystal and provide electronic levels in the band gap.As a result,excited by blue-light-emitting diodes,the novel Y_(3)Sc_(2)Al_(3)O_(12):B^(3+) shows an ultra-broad emission with a full width at half maximum(FWHM)of∼170 nm.Compared to general defect-emitting phosphors,the unique Y_(3)Sc_(2)Al_(3)O_(12):B^(3+) exhibits excellent thermal quenching resistance and superior internal quantum efficiency of up to 95%.These findings not only show great promise of Y_(3)Sc_(2)Al_(3)O_(12):B^(3+)as an extra-broadband emitter but also provide a new design strategy to achieve a full-visible-spectrum phosphor in a single-component material for white-light applications.展开更多
基金funded by the National Natural Science Foundation of China(No.62235014)the Fundamental Research Funds for the Central Universities(No.2023ZYGXZR002).
文摘The development of extra-broadband visible emission phosphors is crucial to achieve next-generation illumination with better color experience.Herein,a defect engineering strategy mediated by the structural cationic substitution is proposed and experimentally demonstrated for specific ultra-broadband emission in a garnet phosphor.The induced oxygen vacancies and interstitial cation through lattice distortion break the periodic potential field of the crystal and provide electronic levels in the band gap.As a result,excited by blue-light-emitting diodes,the novel Y_(3)Sc_(2)Al_(3)O_(12):B^(3+) shows an ultra-broad emission with a full width at half maximum(FWHM)of∼170 nm.Compared to general defect-emitting phosphors,the unique Y_(3)Sc_(2)Al_(3)O_(12):B^(3+) exhibits excellent thermal quenching resistance and superior internal quantum efficiency of up to 95%.These findings not only show great promise of Y_(3)Sc_(2)Al_(3)O_(12):B^(3+)as an extra-broadband emitter but also provide a new design strategy to achieve a full-visible-spectrum phosphor in a single-component material for white-light applications.
