Photoluminescence characterization of Ce3+ and Dy3+ doped Li2CaGeO4 phosphors
Photoluminescence characterization of Ce3+ and Dy3+ doped Li2CaGeO4 phosphors
复制标题
DOI：
10.1016/j.jlumin.2010.02.047
复制
发表时间：
2010-07
影响因子：
3.6
通讯作者：
Meng Jian-xin;Yang Chuang-tao;Chen Qing-qing
中科院分区：
文献类型：
--
作者：
Meng Jian-xin;Yang Chuang-tao;Chen Qing-qing
采用固相反应法制备了Ce3+和DySuP3+激活的LiSub2}CaGeOsub4}荧光粉，并用X射线衍射仪和光致发光技术对其进行了表征。在Li{sub2}CaGeO{sub4}：Dy{sup 3+}的发射光谱中检测到了由{sup 4}F{sub9/2}->；{sup 6}H{sub15/2}(蓝色)和{sup 4}F{sub9/2}->；{sup 6}H{sub13/2}(黄色)跃迁引起的Dy{sup 3+}的特征发射带。在Li{sub2}CaGeO{sub4}：Ce{sup3+}荧光粉中，当激发波长为353 nm时，由于5d-gt；4f跃迁，在372 nm和400 nm处观察到了Ce{sup3+}宽带发射。Ce~(3+)共掺杂显著增强了Dy~(3+)的发光，当Dy~(3+)的摩尔分数大于0.04mol%时发生浓度猝灭。通过调节荧光粉中Dy{SuP3+}的浓度可以实现不同色调的白光。
Ce{sup 3+} and Dy{sup 3+} activated Li{sub 2}CaGeO{sub 4} phosphors were prepared by a solid-state reaction method, and characterized by XRD (X-ray diffraction) and photoluminescence techniques. The characteristic emission bands of Dy{sup 3+} due to {sup 4}F{sub 9/2}->{sup 6}H{sub 15/2} (blue) and {sup 4}F{sub 9/2}->{sup 6}H{sub 13/2} (yellow) transitions were detected in the emission spectra of Li{sub 2}CaGeO{sub 4}:Dy{sup 3+}. Ce{sup 3+} broad band emission was observed in Li{sub 2}CaGeO{sub 4}:Ce{sup 3+} phosphors at 372 and 400 nm due to 5d->4f transition when excited at 353 nm. Co-doping of Ce{sup 3+} enhanced the luminescence of Dy{sup 3+} significantly and concentration quenching occurs when Dy{sup 3+} is beyond 0.04 mol%. White-light with different hues can be realized by tuning Dy{sup 3+} concentration in the phosphors.