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Novel yellowish white-emitting Eu2+-activated phosphate phosphor based on Rb2Ba3P4O14
Kazuma Sugimoto,Takuya Hasegawa,김선욱,Kazuyoshi Uematsu,Kenji Toda,Mineo Sato 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.5
Eu2+-doped Rb2Ba3P4O14 phosphors were synthesized in a single phase form by a conventional solid state reaction method andtheir optical properties were characterized. These phosphors showed broad optical absorption bands that can cover the UVand near-UV region, and exhibited a narrow deep-blue emission and broad reddish-yellow emission with peaks at 423 nm and550 nm, respectively. The highest reddish-yellow emission intensity was obtained for Rb2(Ba0.99Eu0.01)3P4O14.
High thermal stable blue-emitting alkali silicate phosphor, Eu2+-activated Na2Mg2Si6O15
Masato Iwaki,Kazuma Sugimoto,Masaru Watanabe,Kazuyoshi Uematsu,Kenji Toda,Mineo Sato 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.3
White LEDs based on near ultraviolet LED and red/green/blue phosphors have been attracted in terms of outstanding colorrendering index. In particular, we focus on the blue emitting phosphors because the commercial BaMgAl10O17:Eu2+ needs hightemperature in order to be obtained. In this study, we succeeded in synthesizing Eu2+-activated Na2Mg2Si6O15 phosphors asa single phase by the conventional solid state reaction. Eu2+-doped Na2Mg2Si6O15 phosphors showed the broad blue emissionfrom 400-550 nm due to the 4f-5d allowed transition of Eu2+ under the ultraviolet light excitation. Moreover, the emissionintensity of Eu2+-activated Na2Mg2Si6O15 phosphor at high temperature kept about 85% at 423 K, which indicated the thermalstability of Na2Mg2Si6O15:Eu2+ was extremely higher than that of other Eu2+-activated silicate phosphors. Thus, Eu2+-activatedNa2Mg2Si6O15 phosphor is able to become the novel luminescent material for White LED based on the near-ultraviolet LED.
Improved luminescence properties of Na2TiSiO5 phosphor by the Ge4+ doping in the crystal lattice
Young Ji Park,Sun Woog Kim,Kazuma Sugimoto,Takuya Hasegawa,Koudai Tanima,Kazuyoshi Uematsu,Kenji Toda,Mineo Satod 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.5
Rare earth free white emitting Na2TiSi1−xGexO5 phosphors were synthesized by a conventional solid-state reaction method, and the photoluminescence properties were characterized. The phosphors obtained in the present study showed broad bluish-white emission with a peak at 485 nm due to the charge transfer transition between O2− and Ti4+ and the emission peak intensity was effectively enhanced by the Ge4+ doping in the Na2TiSiO5 crystal lattice. The emission peak intensity of Na2TiSi0.5Ge0.5O5 was 1.35 times higher than that of Na2TiSiO5 and the CIE chromaticity coordinate values for the phosphor were x = 0.29 and y = 0.38.