Photoluminescence Properties of Efficient Blue-Emitting Phosphor α-Ca1.65Sr0.35SiO4:Ce3+: Color Tuning via the Substitutions of Si by Al/Ga/B
Photoluminescence Properties of Efficient Blue-Emitting Phosphor α-Ca1.65Sr0.35SiO4:Ce3+: Color Tuning via the Substitutions of Si by Al/Ga/B
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高效蓝光荧光粉 α-Ca1.65Sr0.35SiO4:Ce3 的光致发光特性：通过 Al/Ga/B 取代 Si 进行颜色调节
DOI：
10.1021/acs.inorgchem.5b01197
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发表时间：
2015-08-17
影响因子：
4.6
通讯作者：
Lin, Jun
中科院分区：
文献类型：
--
作者：
Li, Kai;Shang, Mengmeng;Lin, Jun
采用高温固相反应法制备了Al/Ga/B取代和未掺杂Ce~(3+)掺杂的α-Ca1.65Sr0.35SiO_4(CSSO)荧光粉。用X射线衍射谱和Rietveld精修证明了Al/Ga/B成功地掺入到CSSO：Ce3+中。在没有Al/Ga/B的情况下，Ce~(3+)单掺CSSO荧光粉在350 nm激发下表现出强烈的蓝光发射，对应于360~580 nm的可见光带。CSSO：0.05Ce(3+)样品具有最佳发射强度，发射峰值波长为436 nm。在CSSO：0.05Ce(3+)中引入Al/Ga/B后，在365 nm激发下，发射峰分别从436 nm移至457/465/446 nm。Ce3+发射的红移归因于阳离子的多面体扭曲，导致相邻的(Al/Ga/B，Si)O-4多面体的变化导致晶场分裂增强。此外，Al/Ga/B的引入对CSSO：Ce~(3+)的光致发光也有一定的光影响，这对于丰富Ce~(3+)激活的荧光粉的发光颜色是有益的。
A series of Ce3+-doped alpha-Ca1.65Sr0.35SiO4 (CSSO) phosphors without and with the substitutions of Si by Al/Ga/B were synthesized via the high-temperature solid-state reaction process. X-ray diffraction patterns and Rietveld refinements were used to demonstrate the successful incorporations of Al/Ga/B into CSSO:Ce3+. Without Al/Ga/B, the Ce3+ singly doped CSSO phosphors present intense blue emission, which correspond to the broad emission bands in visible region with the wavelength range from 360 to 580 nm upon 350 nm excitation. The optimal emission intensity occurs in CSSO:0.05Ce(3+) sample with the emission peak wavelength at 436 nm. With the introduction of Al/Ga/B into the CSSO:0.05Ce(3+), the emission peak shifts from 436 to 457/465/446 nm under 365 nm excitation, respectively. The red shift of Ce3+ emission is attributed to the polyhedral distortion of the cations, resulting in the enhancement of crystal field spitting due to the variations of the adjacent (Al/Ga/B,Si)O-4 polyhedron. Moreover, the temperature-dependent photoluminescence was determined to be of light impact to CSSO:Ce3+ with the introduction of Al/Ga/B. This research is useful for enriching the emission colors of Ce3+-activated phosphors.