Eu^(3+)掺杂Sr_(3)Y_(2)TeO_(9)的红色荧光粉

Red-Emitting Eu^(3+)-Doped Sr_(3)Y_(2)TeO_(9) Phosphors

采用高温固相法制备了一系列Sr_(3)Y_(2-x)TeO_(9)∶xEu^(3+)新型红色荧光粉,研究了Sr_(3)Y_(2-x)TeO_(9)∶xEu^(3+)的物相结构、发光性能、衰减寿命以及热稳定性。研究结果表明新型红色荧光粉Sr_(3)Y_(2-x)TeO_(9)∶xEu^(3+)能在近紫外光或蓝光激发下发出强烈的红光,并确定了Sr_(3)Y_(2-x)TeO_(9)∶xEu^(3+)的浓度猝灭机制是电偶极-电偶极之间相互作用。其色坐标结果表明,随着掺杂浓度的增加该荧光粉的色坐标均在红色区域。温度相关荧光发射光谱揭示了该荧光粉具有良好的热稳定性。荧光衰减曲线显示在Sr_(3)Y_(2-x)TeO_(9)∶xEu^(3+)荧光粉中当x=0.34时为最佳掺杂浓度,其平均荧光寿命为0.619 ms。综合以上研究结果表明新型红色荧光粉Sr_(3)Y_(2-x)TeO_(9)∶xEu^(3+)在荧光转换近紫外激发白光二极管中具有良好的应用前景。

A series of new red-emitting Sr_(3)Y_(2-x)TeO_(9)∶xEu^(3+)phosphors were prepared by high temperature solid-state method,and the phase structure,luminescent performances,decay life and thermal stability of Sr_(3)Y_(2-x)TeO_(9)∶xEu^(3+)were studied.The results show that new red-emitting Sr_(3)Y_(2-x)TeO_(9)∶xEu^(3+)phosphors can emit intensive red light under near-ultraviolet or blue light excitation,and it demonstrate that the concentration quenching mechanism is attributed to the dipole-dipole interaction between Eu3+ions.The color coordinates of these phosphors with different Eu3+concentrations are in the red spectral region.The temperature-dependent luminescences emission spectra reveal that these phosphors show good thermal stability.The optimal doping concentration of Eu^(3+)is x=0.34 for Sr_(3)Y_(2-x)TeO_(9)∶xEu^(3+)phosphor,and its fluorescence decay lifetime is deduced to be 0.619 ms.These overall results show that new red-emitting Sr_(3)Y_(2-x)TeO_(9)∶xEu^(3+)is promising phosphor applied in phosphor-converted near UV-excited white light-emitting diodes.