Synthesis and photoluminescence properties of Ce3+ and Eu2+-activated Ca7Mg(SiO4)4 phosphors for solid state lighting
Synthesis and photoluminescence properties of Ce3+ and Eu2+-activated Ca7Mg(SiO4)4 phosphors for solid state lighting
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DOI：
10.1039/c2cp23343f
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发表时间：
2012-01-01
影响因子：
3.3
通讯作者：
You, Hongpeng
中科院分区：
文献类型：
--
作者：
Jia, Yongchao;Qiao, Hui;You, Hongpeng
采用常规固相反应合成了Ce3+和Eu2+单掺杂以及Ce3+/Eu2+共掺杂Ca7Mg(SiO4)(4)荧光粉。 Ce3+激活的样品在350 nm激发下表现出强烈的蓝色发射，成分优化的Ca7Mg(SiO4)(4):4% Ce3+显示出比商用蓝色荧光粉BaMgAl10O17:Eu2+ (BAM:Eu2+)更好的色纯度，并表现出优异的外量子效率(65%)。 Ca7Mg(SiO4)4:Eu2+ 粉末在 400-600 nm 波长范围内显示出宽发射带，最大值约为 500 nm。 Ca7Mg(SiO4)(4):Eu2+在250-450 nm波长范围内的强激发带是作为发光二极管转换荧光粉应用的有利特性。此外，在共掺杂样品中观察到从Ce3+离子到Eu2+离子的能量转移，确定共振型能量转移是由于偶极-偶极相互作用机制，并通过光谱重叠法和浓度猝灭法获得了临界距离。
Ce3+ and Eu2+ singly doped and Ce3+/Eu2+-codoped Ca7Mg(SiO4)(4) phosphors are synthesized by the conventional solid state reaction. The Ce3+ activated sample exhibits intense blue emission under 350 nm excitation, the composition-optimized Ca7Mg(SiO4)(4):4% Ce3+ shows better color purity than the commercial blue phosphor, BaMgAl10O17:Eu2+ (BAM:Eu2+) and exhibits superior external quantum efficiency (65%). The Ca7Mg(SiO4)4:Eu2+ powder shows a broad emission band in the wavelength range of 400-600 nm with a maximum at about 500 nm. The strong excitation bands of the Ca7Mg(SiO4)(4):Eu2+ in the wavelength range of 250-450 nm are favorable properties for applications as light-emitting-diode conversion phosphors. Furthermore, the energy transfer from the Ce3+ to Eu2+ ions is observed in the codoped samples, the resonance-type energy transfer is determined to be due to the dipole-dipole interaction mechanism and the critical distance is obtained through the spectral overlap approach and concentration quenching method.