首页|Cr3+activated Na3RESi3O9(RE=Y,Lu,Sc)silicate broadband near-infrared phosphors for luminescence towards NIR-Ⅱ region via a multi-site occupancy strategy
Cr3+activated Na3RESi3O9(RE=Y,Lu,Sc)silicate broadband near-infrared phosphors for luminescence towards NIR-Ⅱ region via a multi-site occupancy strategy
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Phosphor-converted near-infrared light-emitting diodes(NIR pc-LEDs)are finding applications in various fields including food quality analysis,biomedical imaging,night vision,and biomedicine.The crucial factor in the development of NIR pc-LEDs devices lies in the advancement of high-performance broad-band NIR phosphors.In this work,novel Cr3+-activated silicate phosphors NaRESi3O9(RE=Y,Lu,Sc)are reported.This silicate has a special 3D network structure in which RE has four different sites,forming four octahedrons and providing suitable occupation sites for Cr3+.The phosphors demonstrate a wide emission spectrum ranging from 750 to 1450 nm when excited by light at 468 nm.The full width at half maximum(FWHM),which benefits from the presence of Cr3+ions occupying multiple sites,is measured to be 203 nm.Notably,the strongest emission peak is observed at a longer wavelength of 984 nm compared to most other systems activated by Cr3+.The Na3ScSi3O9 lattice provides a weak crystal field(Dq/B=1.97)and weak phonon-photon coupling for Cr3+,and the integrated emission intensity of Na3ScSi3O9∶0.03Cr3+is 4.66 times stronger than that of Na3YSi3O9∶0.03Cr3+.
Jiantong Wang、Changshuai Gong、Sihan Yang、Qi Zhu、Xuejiao Wang、Ji-Guang Li
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College of Chemistry and Materials Engineering,Bohai University,Jinzhou,121007,China
Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education),School of Materials Science and Engineering,Northeastern University,Shenyang,110819,China
Research Center for Electronic and Optical Materials,National Institute for Materials Science,Tsukuba,Ibaraki 305-0044,Japan
Natural Science Foundation of The Educational Department of Liaoning ProvinceNatural Science Foundation of Liaoning Province
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