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Luminescence properties of (Sr0.95−x−yMgxYy)Si2O2−yN2+y:Eu2+ 0.05 for novel LED conversion phosphors

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Abstract

By incorporating Mg and Y into SrSi2O2N2:Eu2+ phosphor, we intended to improve the relatively high thermal quenching and poor efficiency of emission in conventionalSrSi2O2N2:Eu2+ phosphors. MSi2O2N2:Eu2+ 0.05 (M = Sr, Mg, Y) compounds were synthesized by ahigh-temperature solid-state reactionand were characterized using X-ray power diffraction as well as excitation and emission spectroscopy. As compared to the pure SrSi2O2N2:Eu2+ 0.05, the emission intensity of the new MSi2O2N2:Eu2+ 0.05 (M = Sr, Mg, Y) compound was increased by 65 %. Meanwhile, it was also possible to improve the ratio of thermal quenching up to 88 % by substituting the Sr with Mg and/or Y in the SrSi2O2N2:Eu2+ 0.05 crystal structure. This improvement was mainly due to the intrinsic electronic negativity and size effect of Y3+, which leads to the shrinkage of the O/N ratioand the relaxation of local strain around the Eu2+ ion in the (Sr0.95−x−yMgxYy)Si2O2−yN2+y:Eu2+ 0.05 structure. Consequently, the (Sr0.68Mg0.27)Si2O2N2:Eu2+ 0.05 phosphor is expected to be useful as a novel conversion phosphor with high thermal stability for white-light LEDs.

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Authors and Affiliations

  1. Hwadong Middle School, Sangju-si, Gyeongbuk, 742-882, Korea

    Soon Duk Jee

  2. Advanced Materials Division, Korea Research Institute of Chemical Technology, Daejeon, 305-600, Korea

    Kang Sik Choi

  3. School of Nano & Advanced Materials Engineering, Kyungpook National University, Gyeongbuk, 742-711, Korea

    Ji Sik Kim

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  1. Soon Duk Jee
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  2. Kang Sik Choi
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  3. Ji Sik Kim
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Correspondence to Ji Sik Kim.

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Jee, S.D., Choi, K.S. & Kim, J.S. Luminescence properties of (Sr0.95−x−yMgxYy)Si2O2−yN2+y:Eu2+ 0.05 for novel LED conversion phosphors. Met. Mater. Int. 17, 655–660 (2011). https://doi.org/10.1007/s12540-011-0821-9

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  • DOI: https://doi.org/10.1007/s12540-011-0821-9

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