近紫外激发Ba2ZnW1-xMoxO6:Eu3+,Li+红色荧光粉的制备及其荧光性能

Synthesis and Luminescence Properties of Red-emitting Phosphor Ba2ZnW1-xMoxO6:Eu3+,Li+ under Near-UV Light Excitation

通过高温固相法制备了系列Ba2ZnW1-xMoxO6：Eu3＋，Li＋红色荧光粉，研究了Mo6＋离子掺杂对样品的晶体结构以及荧光性能的影响。结果表明：部分Mo6＋离子取代W6＋离子后，样品的激发波长发生红移，最大激发波长从316nm转移到373nm，使得样品能有效地被近紫外光（350～420nm）激发。Ba2ZnW1-xMoxO6：Eu3＋，Li＋在373nm波长的激发下，所得的荧光强度最强。Eu3＋离子的特征跃迁仍以5D0→7F1（598nm）跃迁为主，但5D0→7F2（615nm）跃迁得以加强。通过其发射光谱计算所得色坐标为（0．6385，0．3611），接近标准红色色坐标。Ba2ZnW1-xMoxO6：Eu3＋，Li＋作为红色荧光粉在被近紫外激发的白光LED中具有很好的应用前景。

A series of red phosphorsBa2ZnW1-xMoxO6：Eu3＋,Li＋ （BZWM） were prepared by a high-temperature solid-state method. The effects of Mo6＋ ions doping on the crystal structure, and photoluminescence properties, morphology and size of the phosphor powders were investigated. The results show that the fluorescence excitation wavelength is red-shifted, and the largest wavelength is changed from 316 nm to 373 nm when W6＋ ions are substituted by Mo6＋ ions, thus leading to that the phosphors can be excited more efficiently by near-UV （350--420 nm）. Ba2ZnW1-xMoxO6：Eu3＋,Li＋ has the maximum emission intensity under the excitation wavelength of 373 nm. Although the emission intensity varies with Mo content, the 5D0→7F1 emission dominates in all the spectra. The CIE chromaticity coordinates ofBa2ZnW1-xMoxO6：Eu3＋,Li＋ （0.6385, 0.3611） are similar to the standard coordinates of red phosphor. The results indicate that the BZWM phosphor could be a promising red phosphor for near-UV excited WLEDs.