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第七届全国稀土发光材料学术研讨会

作者： zhongxian qiu,chunying rong,liping yu and shixun lian~* (key laboratory of chemical biology & traditional chinese medicine research(Ministiy of Education) key Laboratoiy of Sustainable Resources Processing and Advanced Materials of Hunan Province,Hunan Normal University,Changsha,Hunan 410081,China)

The color-tunable phosphors Mn -activated ZnS emitting from yellow to red have drawn significant attention and are expected to apply for electroluminescent(EL) devices as novel electrical-to-light converters in recent *** no report is about the promising application for solar cells as a spectral converter yet. Powder samples of ZnS:Mn,Tm were prepared by a solid-state *** raw materials were ZnS,

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To tune europium valence by controlling the composition in diphase silicate phosphors

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Journal of Rare Earths 2018年第10期36卷 1015-1023页

作者： Yiting Lin Jukui Zhou zhongxian qiu Wenli Zhou Jilin Zhang Chengzhi Li liping yu shixun lian key laboratory of chemical biology & traditional chinese medicine research (Ministry of Education) Key Laboratory of Sustainable Resources Processing and Advanced Materials of Hunan ProvinceCollege of Chemistry and Chemical EngineeringHunan Normal University

Commercial phosphors always require fewer impurities and higher crystallinity, but sometimes it is difficult or strict to synthesize a pure phase compound. Indeed, if the practical application is not influenced, it is acceptable to synthesize a kind of phosphors with diphase matrix that have similar structure and photoluminescence properties. In present work, we designed and synthesized a series of（1-x）BaMSiO4·xBa2 MSi2 O7：Eu（M = Zn2＋, Mg2＋） diphase phosphors which contained two phases BaMSiO4（hexagonal, P63） and Ba2 MSi2 O7（monoclinic, C2/c） by a high temperature solid-state reaction in air condition. The structures and luminescence properties related to the phase transform from BaMSiO4 to Ba2 MSi2 O7 were analyzed carefully. The results show that the self-reduction ability of Eu3＋ is not the best in above four compounds, respectively. But it reaches the maximum and gets the green emission under the UV lamp when the matrix is in a proper ratio of two phases, which suggests that the heterostructure between the two crystals（BaMSiO4 and Ba2 MSi2 O7） improves the self-reduction process of the *** possible mechanism of the tunable europium valence and the luminescent properties in（1-x）BaMSiO4·xBa2 MSi2 O7：Eu phosphors were discussed in detail.

关键词： Diphase phosphors Silicate Heterostructure Eu Self-reduction Rare earths

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Fine controllable blue emission and its mechanism in Ce^(3+)-doped orthosilicate solid solution phosphors for different plant growths

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Journal of Rare Earths 2018年第11期36卷 1150-1156页

作者： Yaru Yang Yiting Lin yue Han zhongxian qiu Wenli Zhou Jilin Zhang Chengzhi Li liping yu shixun lian key laboratory of chemical biology & traditional chinese medicine research (Ministry of Education) Key Laboratory of Sustainable Resources Processing and Advanced Materials of Hunan ProvinceCollege of Chemistry and Chemical EngineeringHunan Normal University

The designed Ce^3＋-doped alkaline-earth silicate phosphors CamSr2 m-nBanSiO4：Ce^3＋,Li^＋（CSBS：Ce^3＋） were synthesized by a high temperature solid-state reaction. The crystal field splitting and the centroid shift from the flee ion energy of 5d configuration were approximated from the spectrum for Ca2SiO4, Sr2SiO4 and Ba2SiO4 phosphors. The single-phase purity was checked by means of X-ray diffraction. Here, when the doped concentration of Ca2. is less than 80% （m 〈 1.6）, we report the structural phase transformation from monoclinic system [3-Ca2Si04 to orthorhombic system α′-Ca2SiO4. The phosphors excited by near-ultraviolet （NUV） light at wavelengths ranging from 200 to 400 nm demonstrate a broad asymmetric blue emission band. The emission peak wavelength redshifts firstly from 417 nm of Ca2SiO4 to 438 nm of Sro.3Cal.6SiO4, and then blueshifts to 411 nm of Sr2SiO4, and the end of 401 nm of Ba2SiOa. These results indicate that the tunable blue-emission of the phosphors can he realized through changing the solid solution components, which has a potential use as a blue component for fabricated precision modulation LEDs light sources and auxiliaries of SSC plastics films for different plant growths. We discuss in detail the possible mechanism and energy diagram of the tunable blue luminescence in CamSr2-M-nBaNSiO4：Ce^3＋.Li^＋ phosphors.

关键词： Ce^3+ Controllable blue emission Alkaline-earth silicate Solid solution Plant growth Rare earths

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