Eu3+掺杂CaMoO4柿子饼形貌荧光粉的可控发光以及能量传递研究

Controllable Luminescence and Energy Transfer of Eu3+ Doped CaMoO4 Persimmon Cake-like Phosphors

由于水热法在纳米晶合成方面具有优势,因此以硝酸钙、硝酸铕和钼酸铵为原料,采用水热法合成了Eu^3+掺杂CaMoO4的红色荧光粉。利用XRD、SEM和PL进行表征,研究Eu^3+掺杂摩尔分数对样品的结晶性、尺寸与形貌以及发光性能的影响。XRD分析表明,所合成样品CaMoO4:Eu^3+都为纯相白钨矿结构的CaMoO4。激发和发射谱图的测试结果表明CaMoO4:Eu^3+可以被近紫外光有效激发,实现高色纯度的红光发射。在掺杂摩尔分数范围内可以观察到从CaMoO4基质到Eu^3+离子的能量转移及浓度猝灭效应。当掺杂摩尔分数为5%时,CaMoO4:Eu^3+表现出最佳的发光性能,可以作为一种性能优良的红色荧光粉材料应用于白光LED领域。

Using Ca(NO 3 ) 2 ,Eu(NO 3 ) 3 and (NH 4 ) 6 Mo 7 O 24 as raw materials,persimmon cake-like CaMoO 4 :Eu ^3+ red phosphors were synthesized through hydrothermal method by changing the doping concentration of Eu ^3+.The crystallinity,size,morphology,and luminescent properties of the samples were systematically characterized by XRD,SEM and PL.The results indicated that the CaMoO 4 :Eu^ 3+ red phosphors are scheelite structure.Excitation and emission spectra show that CaMoO 4 :Eu^ 3+ can be efficiently excited by near-ultraviolet light to achieve high color purity red emission.Within the range of doping concentration,the energy transfer from CaMoO 4 matrix to Eu ^3+ ions and the concentration quenching effect can be observed.The experimental results show that CaMoO 4 :Eu^3+ with 5% doping shows excellent luminescence properties,which could be a good red phosphor material and potential applications in white light-emitting diodes (LEDs).