溶胶-凝胶法制备Zn3Ga2Ge2O10:Cr3+0.01,Pr3+0.03,Yb3+0.3纳米长余辉材料及其表面修饰的研究

以Ga(NO3)3·8H2O、Zn(NO3)2·6H2O、Pr(NO3)2·6H2O、GeO2、Yb(NO3)3·5H2O、Cr(NO3)2·9H2O为原料,采用溶胶-凝胶法合成了Cr3+,Pr3+,Yb3+共掺杂的Zn3Ga2Ge2O10长余辉纳米材料(PLNPs).利用XRD,SEM,激发发射图谱,余辉曲线测试确定1000℃煅烧,保温3 h时,基质Zn3 Ga2 Ge2 O10已形成.Yb3+掺杂百分比为0.3时,样品的发光性能最好.Zn3 Ga2 Ge2 O10:Cr3+0.01,Pr3+0.03,Yb3+0.3纳米长余辉材料在波长为267 nm的紫外线激发下发射出中心波长为745 nm的深樱桃红色光,此时晶粒粒径约为150 nm;随着Yb3+掺杂百分比的增加,晶粒粒径逐渐变小.通过FT-IR,Zeta电势,激光粒度测试,TEM及悬浮实验测试表明,PEG修饰PLNPs后,可观察到明显的核壳结构,水合粒径约为155 nm;水溶性大大增加,0.3 mg/mL的浓度下其悬浮时间超过48 h,这表明PEG包裹PLNPs成功.

Preparation of Long-afterglow Nano-Zn3Ga2Ge2O10:Cr3 +0.01 , Pr3+0.03 , Yb3+0.3 by Sol-gel Method and Its Surface Modification

Cr3+, Pr3+, Yb3+co-doped Zn3 Ga2 Ge2 O10 long afterglow nanophase powders were synthesized by sol-gel method from Ga(NO3)3· 8H2O, Zn(NO3)2· 6H2O, GeO2, Pr(NO3)2· 6H2O, Cr(NO3)2 · 9H2O, Yb(NO3)3· 5H2O and C3H8O7· H2O.Through XRD, SEM, excitation and emission decay curve, Zn3 Ga2 Ge2 O10 was formed after sintering at 1000 ℃ for 3 h.Samples have the best luminescent properties when the doping amount of Yb 3+is 0.3.Zn3Ga2Ge2O10:Cr3+0.01,Pr3 +0.03,Yb3+0.3 can emit deep cherry red light of 745 nm in the motivation of 267 nm UV excitation and the grain size is about 150 nm. With the increase of Yb3+ content, the grain size gradually becomes smaller .Through FT-IR, Zate potential , particle size TEM and suspension experiments , it is indicated that there is obvious core-shell structure after PEG modified PLNPs .Hydrated particle size of PEG-PLNPs is about 155 nm and the water solubility increases greatly which can suspense more than 48 h at the concentration of 0.3 mg/mL.The above shows that the PEG package PLNPs successfully .