采用高温固相法在1 150 ℃下经二次煅烧合成了双钙钛矿型的红色荧光粉Sr2ZnTeO6∶xEu3+(x=0.05-0.40), 并进行了相组成、发光性质和热稳定性的研究。结果表明, 所合成的Sr2ZnTeO6与Sr2ZnWO6具有相同的结构, 掺杂离子的加入没有改变相结构。样品的激发光谱由电荷迁移带和Eu3+离子的特征激发峰组成, 主激发峰位于464 nm(7F0→5L6)。样品的发射光谱位于614 nm(5D0→7F2)。Sr2ZnTeO6∶xEu3+荧光粉的发光强度随着Eu3+离子的掺杂, 先增大后减小, 在x≥0.25时, 发生浓度猝灭现象。通过变温荧光发现它具有非常好的热稳定性。由于荧光粉的最佳激发位于464 nm, 因而可以用于蓝光激发下的白光LED的红色荧光粉。

A series of novel double perovskite tellurate red-emitting phosphors Sr2ZnTeO6∶xEu3+(x=0.05-0.40) were successfully synthesized by a high-temperature solid-state reaction method at 1 150 ℃. The phase structure, photoluminescence properties and thermal stability of the phosphor were investigated in detail. The phosphor shows dominant emission peak at 614 nm belonging to the 5D0→7F2 electric dipole transition under 464 nm excitation. The luminescence intensity keeps increasing with increasing the content of Eu3+ to 25%, and the critical transfer distance of Eu3+ was calculated to be 1.2 nm. The quenching temperature for Sr2ZnTeO6∶0.25Eu3+was estimated to be above 500 K. This spectral feature reveals high color purity and excellent chromaticity coordinate characteristics. Therefore, Eu3+-doped Sr2ZnTeO6 phosphors are potential red phosphors for blue chip-based white light-emitting diode and display devices.