荧光粉
材料科学
光致发光
动力学
降水
胶体
化学工程
溶剂
有机化学
光电子学
化学
物理
气象学
工程类
量子力学
作者
Ji-Guang Li,Qi Zhu,Xin Li,Xudong Sun,Yoshio Sakka
出处
期刊:Acta Materialia
[Elsevier]
日期:2011-05-01
卷期号:59 (9): 3688-3696
被引量:60
标识
DOI:10.1016/j.actamat.2011.03.004
摘要
Abstract The synthesis of basic carbonate monospheres was attempted for the Gd/Eu binary system via urea-based homogeneous precipitation, with emphases on particle size and cation distribution control. It was demonstrated that the use of water/organic-solvent mixture as the reaction medium not only allows facile particle size control in the wide range of ∼50–500 nm but also effectively alleviates the detrimental sequential precipitation between the Gd and Eu components. The results are discussed from the mechanism of carbonate precipitation and the dielectric constant and surface tension of the organic co-solvent. Annealing the basic carbonate monosheres at 800 °C for 12 h yields well-dispersed (Gd 1− x Eu x ) 2 O 3 phosphor particles that exhibit sharp red emissions at 610 nm under 259 nm charge transfer excitation. The phosphor spheres show a luminescence quenching concentration of 7–9 at.% for Eu 3+ and clearly size-dependent luminescent behavior. Both the intensity of the 610 nm emission and the asymmetry factor of luminescence [ I ( 5 D 0 → 7 F 2 )/ I ( 5 D 0 → 7 F 1 )] steadily increase with smaller particle size—findings that have been ascribed to decreased grain-boundary density and enhanced surface/volume effects, respectively. With their excellent morphological uniformity and close-packing ability, the (Gd 1− x Eu x ) 2 O 3 phosphor spheres synthesized in this work may find potential applications in various lighting and display devices.
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