Luminescence properties of Ca3Si2O7: Dy3+ phosphor for white light-emitting diodes
Luminescence properties of Ca3Si2O7: Dy3+ phosphor for white light-emitting diodes
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白光发光二极管用Ca3Si2O7:Dy3荧光粉的发光性能
DOI：
10.1016/j.matlet.2012.04.049
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发表时间：
2012-07
影响因子：
3
通讯作者：
Meng, Fanbin
中科院分区：
文献类型：
--
作者：
Zhang, Xinghua;Lu, Zunming;Meng, Fanbin
制备了具有不同Dy3+浓度的Ca3−xSi2O7: xDy3+(x=0.03, 0.05, 0.07, 0.10)白色荧光粉，并对其光致发光性能进行了研究。XRD结果表明，当x≤0.10时，Ca2+被Dy3+取代不会改变Ca3Si2O7host的结构。SEM图像显示磷光体聚集明显，磷光体颗粒形状不规则。EDX结果表明，该荧光粉由Ca、Si、O和Dy元素组成。350nm激发下的发光光谱由两条特征蓝带和黄带组成，分别对应于Dy3+的4f9 /2→6h15 /2和4f9 /2→6h13 /2跃迁。在350nm激发下，随着Dy3+浓度的升高，黄蓝发射强度比增大，样品的评价色坐标落在白光区域。高浓度掺杂的ca3si2o7荧光粉中Dy3+离子之间的能量传递方式为偶极-偶极相互作用。x=0.05样品在365nm激发下的量子效率为15.16%。
A new white Ca3−xSi2O7: xDy3+(x=0.03, 0.05, 0.07, 0.10) phosphor with various Dy3+concentrations was prepared and its photoluminescent properties were investigated. The XRD results show that the Dy3+substitution of Ca2+does not change the structure of Ca3Si2O7host for x≤0.10. The SEM image displays that phosphors aggregate obviously, and the shape of the phosphor particle is irregular. The EDX results reveal that the phosphors consist of Ca, Si, O and Dy elements. Luminescence spectra excited by 350nm consist of two characteristic blue and yellow bands, which correspond to4F9/2→6H15/2and4F9/2→6H13/2transitions of Dy3+, respectively. The yellow-to-blue emission intensity ratio under excitation of 350nm increases with the elevated Dy3+concentrations, and the evaluated color coordinates of the investigated samples fall in the white light region. The energy transfer style between Dy3+ions is dipole–dipole interaction for higher concentration Dy3+doped Ca3Si2O7phosphor. The quantum efficiency for x=0.05 sample excited by 365nm is 15.16%.
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