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采用高温固相法制备了Ca9Al(PO4)7∶Eu2+蓝色荧光粉,研究了Ca9Al(PO4)7∶Eu2+的发光、浓度猝灭及温度稳定性.Ca9Al(PO4)7∶Eu2+的激发光谱覆盖200~350 nm紫外区;发射光谱为一主峰位于445 nm的宽谱,对应Eu2+的4f6 5d1--→4f特征跃迁.研究发现,随Eu2+掺杂量的增大,Ca9Al(PO4)7∶Eu2+的发射强度呈现先增大、后减小的变化趋势,最大发射强度对应的Eu2+掺杂量为0.01,即存在浓度猝灭效应,对应的机理为电偶极-电偶极相互作用;依据晶格常数,得出临界距离为2.297 nm.在25~300℃范围内改变光谱测量温度,发现温度升高到150℃时,Ca9Al(PO4)7∶Eu2+的发射强度变为25℃时的81.0%,对应的激活能为0.268 eV,说明材料具有较好的温度稳定性. 相似文献
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A blue emitting phosphor Sr3Bi(PO4)3:Eu2+ is synthesized luminescent property is investigated. Sr3Bi(PO4 )3 :Eu^2+ can by a high-temperature solid state method, and its create blue emission under the 332 radiation excitation, and the prominent luminescence in blue (423nm) due to the 4fSd^1→4f^7 transition of the Eu^2+ ion. The crystallographic sites of the Eu^2+ ion in Sr3Bi(PO4)3 are analyzed, and the 420 and 440 nm emission peaks of the Eu^2+ ion are assigned to the nine-coordination and eight-coordination, respectively. The emission intensity of Sr3Bi(PO4)3:Eu^2+ is influenced by the Eu^2+ doping content, and the concentration quenching effect is observed. The quenching mechanism is the dipole-dipole interaction, and the critical distance of energy transfer is calculated by the concentration quenching method to be approximately 1.72nm. 相似文献
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