For efficient near-infrared(NIR)emitters,tuning their luminescence properties is important for their extended optical applications.A fundamental study of garnet-type inorganics has led to the development of a new NIR ...For efficient near-infrared(NIR)emitters,tuning their luminescence properties is important for their extended optical applications.A fundamental study of garnet-type inorganics has led to the development of a new NIR phosphor Y_(3)ScAl4O12:Cr^(3+)(YSAO:Cr^(3+)),exhibiting emission in the range of 600 to 950 nm,an internal quantum efficiency(IQE)of 84.01%,and good thermal stability at 423 K(89.7%of that at room temperature).Doping with Yb^(3+)/Nd^(3+)ions helps achieve an efficient energy transfer from the Cr^(3+)to Yb^(3+)/Nd^(3+)ions with excellent thermal stability.NIR pc-LED devices prepared using YSAO:Cr^(3+),Yb^(3+)and YSAO:Cr^(3+),Nd^(3+)can achieve high NIR output powers of 46.37 and 42.82 mW at 100 mA and photoconversion efficiencies of 20.27 and 18.84%at a driving current of 20 mA,respectively.Furthermore,the NIR pc-LED package demonstrated excellent capability for penetrating biological tissues,effectively distinguishing between pork,chicken,and beef.These results suggest that the phosphors can be utilized for non-destructive monitoring applications.展开更多
基金supported by the National Key Research and Development Program(grant no.2022YFC2905201)the National Natural Science Foundation of China(grant no.52072363 and 22305250)the research fund of the Key Laboratory of Rare Earths,Chinese Academy of Sciences.
文摘For efficient near-infrared(NIR)emitters,tuning their luminescence properties is important for their extended optical applications.A fundamental study of garnet-type inorganics has led to the development of a new NIR phosphor Y_(3)ScAl4O12:Cr^(3+)(YSAO:Cr^(3+)),exhibiting emission in the range of 600 to 950 nm,an internal quantum efficiency(IQE)of 84.01%,and good thermal stability at 423 K(89.7%of that at room temperature).Doping with Yb^(3+)/Nd^(3+)ions helps achieve an efficient energy transfer from the Cr^(3+)to Yb^(3+)/Nd^(3+)ions with excellent thermal stability.NIR pc-LED devices prepared using YSAO:Cr^(3+),Yb^(3+)and YSAO:Cr^(3+),Nd^(3+)can achieve high NIR output powers of 46.37 and 42.82 mW at 100 mA and photoconversion efficiencies of 20.27 and 18.84%at a driving current of 20 mA,respectively.Furthermore,the NIR pc-LED package demonstrated excellent capability for penetrating biological tissues,effectively distinguishing between pork,chicken,and beef.These results suggest that the phosphors can be utilized for non-destructive monitoring applications.
