MZnPO4：RE(M=Li,Na,K;RE=Eu^3＋,La^3＋,Ce^3＋)的高温固相合成及其发光性质

High-Temperature Solid-State Synthesis and Luminescent Properties of MZnPO_4: RE( M = Li,Na,K; RE = Eu^(3+),La^(3+),Ce^(3+))

采用高温固相反应合成MZn PO4:RE(M=Li,Na,K;RE=Eu3+,La3+,Ce3+),用X射线衍射(XRD)、扫描电镜(SEM)和能谱分析(EDS)等方法对产物进行了表征,并对产物的发光性能进行研究。结果表明:掺杂三价稀土离子Eu3+,La3+,Ce3+没有改变MZn PO4(M=Li,Na,K)的晶体结构和颗粒形貌;在紫外光(260 nm)激发下,Eu3+掺杂的MZn PO4:Eu3+(M=Li,Na,K)改变了MZn PO4(M=Li,Na,K)原有的发光波长,发射橙红色光,主峰位于595 nm附近,为Eu3+的5D0→7F1跃迁发射;La3+,Ce3+掺杂的MZn PO4:RE(M=Li,Na,K,RE=La3+,Ce3+)则发射蓝色光,最高峰对应波长为400~500 nm,没有改变MZn PO4(M=Li,Na,K)的发光波长,但提高了强度,La3+掺杂的强度大于Ce3+掺杂;除了基质本身对发光的贡献外,Ce3+有很弱的5d1→4f1的跃迁发射,而非荧光稀土离子La3+作为添加剂可提高基质材料的荧光性能。

Samples of MZn PO4： RE（ M = Li,Na,K; RE = Eu^3＋,La^3＋,Ce^3＋） were synthesized by high temperature solid-state reaction,and characterized by X-ray diffraction（ XRD）,scanning electron microscope（ SEM） and energy dispersed spectrometer（ EDS）. The luminescent properties were investigated using luminescence spectra. The results showed that the crystal structure and particle morphology of MZn PO4（ M = Li,Na,K） did not change after being doped with Eu^3＋,La^3＋,Ce^3＋. However,under the ultraviolet（ 260 μm） radiation,Eu^3＋doped MZn PO4： Eu^3＋（ M = Li,Na,K） changed the luminescence wavelength of MZn PO4（ M = Li,Na,K）,which emitted orange-red light showing a dominant peak at 595 nm,which was the5D0→7F1transition of Eu^3＋. La^3＋,Ce^3＋doped MZn PO4： RE（ M = Li,Na,K,RE = La^3＋,Ce^3＋） emitted blue light showing a dominant peak at 400 － 500 nm without changing the luminescence wavelength of MZn PO4（ M = Li,Na,K）,but the luminescence intensity was improved. In addition to the contribution of the matrix material to this emission spectrum,the non-fluorescence rare earth ions La^3＋as additives could improve the fluorescent properties of the substrate material,which was greatly enhanced compared with that of the weaker 5d1→4f1transition of Ce^3＋.