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A series of LiY1-xEux(MoO4)2 red-emitting phosphors were synthesized by sol-gel technique. The phase impurity and spectroscopic properties were characterized by X-ray diffraction (XRD) and photo-luminescence (PL) spectra respectively. The effect of Eu3+ doping con-centration, annealing temperature and the molar ratio of citric acid to the total metal cations (C:M) on the optical properties of the red phos-phors were studied and optimized. It was found that all the samples could be excited efficiently by blue light (465 nm), which was well coin-cident with the emission of GaN based LED chips. The luminescent intensity reached maximum when annealing temperature was 750 ?C and Eu3+ doping concentration was 5% with C:M=3:1. 相似文献
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用溶胶凝胶法制备了一系列不同掺杂浓度的Y3Al5O12(YAG):Tb3+,Ce3+荧光粉,对其物相、光学性能和能量传递进行了研究。多晶粉末X-射线衍射结果表明,所有样品均为YAG晶相,没有其它杂相。当样品在Tb3+的特征激发峰273 nm激发时,除了Tb3+的特征发射外,还观察到位于467 nm的YAG基质的电荷迁移带、位于520 nm的Ce3+的2D3/2,5/2→2F5/2,7/2跃迁,这说明可能存在Tb3+到Ce3+的单向非辐射能量传递。通过监测共掺样品520 nm的发光,得到273 nm的激发峰,使得Tb3+(5D3)到Ce3+(2Di,i=5/2,3/2)的单向非辐射能量传递得到验证;并且随着掺杂Tb3+浓度的增大,273 nm激发峰增强。同时,Ce3+掺杂YAG:Tb3+并没有使Tb3+发光增强,相反YAG:Tb3+,Ce3+中Tb3+发光与YAG:Tb3+相比有1个数量级的减弱,造成这种情况的可能原因,一是Tb3+到Ce3+的单向非辐射能量传递,使得Tb3+发光减弱;二是Ce3+掺杂YAG:Tb3+后基质所多吸收的能量传给了Ce3+而非Tb3+。 相似文献
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