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| 1 | Structural investigation and luminescent properties of BaZr(BO_3)_2:Eu^(3+) phosphors containing Si显示文摘Si4+-doped BaZr(BO3)2:Eu3+ phosphors are prepared by a conventional solid-state reaction.The influence of Si4+ addition on the charge transfer state of Eu3+-O2- and photoluminescence(PL) properties of BaZr(BO3)2:Eu3+ are discussed.Room temperature PL spectra indicated that efficient emission is obtained by Si doping.Increased values for the peak-peak ratio(PPR) of BaZr(BO3)2:Eu3+ at higher Si doping concentrations implied that the Eu3+ ion is located in a more asymmetric environment in BaZr0.8Si0.2(BO3)2:Eu3+ than in the undoped samples.The Judd-Ofelt parameters Ωλ(λ=2,4) were calculated from the PL data,giving results that were consistent with those from the PPR.The maximum radiative quantum efficiency was achieved at a Si doping concentration of 20 mol%. | ZHANG ZhongPeng LI GuangMin ZHANG XiaoSong XU ShengYan JI Ting LI Lan | 2010 | Chinese Science Bulletin2010，55，29： | 3 |
| 2 | Photoluminescence and cathodoluminescence properties of a novel CaLaGa_3O_7:Dy^(3+) phosphor显示文摘A single host white emitting phosphor, CaLaGa3O7:Dy3+, was synthesized by chemical co-precipitation. Field emission scanning electron microscopy, X-ray diffraction, laser particle size analysis, and photoluminescence and cathodoluminescence spectra were used to investigate the structural and optical properties of the phosphor. The phosphor particles were composed of microspheres with a slight tendency to agglomerate, and an average diameter was of about 1.0 μm. The Dy3+ ions acted as luminescent centers, and substituted La3+ ions in the single crystal lattice of CaLaGa3O7 where they were located in Cs sites. Under excitation with ultraviolet light and a low voltage electron beam, the CaLaGa3O7:Dy3+ phosphor exhibited the characteristic emission of Dy3+ (4F9/2-6H15/2 and 4F9/2-6H13/2 transitions) with intense yellow emission at about 573 nm. The chromaticity coordinates for the phosphor were in the white region. The relevant luminescence mechanisms of the phosphor are investigated. This phosphor may be applied in both field emission displays and white light-emitting diodes. | ZHAO WenYu1,2, AN ShengLi1, FAN Bin1, LI SongBo1 & DAI YaTang3 1 School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China 2 School of Chemistry and Chemical Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China 3 School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621000, China | 2012 | Chinese Science Bulletin2012，57，7： | 2 |
| 3 | CaLaGa_3O_7:Dy^(3+)荧光粉的光致和阴极射线发光性能显示文摘采用化学共沉淀法制备单一基质CaLaGa3O7:Dy3+白色荧光粉,借助场发射扫描电子显微镜(field emission scanning electron microscopy,FE-SEM),X-射线衍射(X-ray diffraction,XRD),激光粒度仪,光致发光(photoluminescence,PL)和阴极射线发光(cathodoluminescence,CL)光谱对其结构和光学性能进行研究.结果表明,样品由一些黏结在一起的近球形颗粒组成,有轻微的团聚现象,平均粒径约为1.0?m.Dy3+离子作为发光中心取代CaLaGa3O7晶格中的La3+离子,其对称格位为Cs.在紫外光和低压电子束的激发下,CaLaGa3O7:Dy3+荧光粉表现出Dy3+的特征发射(4F9/2-6H15/2跃迁和4F9/2-6H13/2跃迁),其最强发射峰为573nm(黄光).样品的色坐标均位于白光区域,并讨论了发光机理.此荧光粉可被应用于场发射显示器(field emission displays,FEDs)和白光发光二极管(light-emitting diodes,LED)中. | 赵文玉 安胜利 樊彬 李松波 戴亚堂 | 2012 | 科学通报2012，57，2： | 1 |
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