Sol-Gel Synthesis Of SrAl_2O4: Eu～(2+), Dy～(3+) Nano-Particle Phosphor

Since the new long persistent phosphorescent SrAl2O4. Eu2+, Dy3+ phosphor was invented in the 1990s, it takes the place of the conventional long persistent phosphorescent ZnS: Cu2+ phosphor, and it is followed with interest at home and abroad. In recent years, SrAl2O4: Eu2+, Dy3+ phosphor with excellent physical-chemical properties has can be synthesized successfully. But, as far as the method of synthesis is concerned, it still mainly focuses on the conventional high temperature solid state reaction method. In present, few research work has been carried out to prepare SrAl2O4:Eu2+,Dy3+ through other methods. Sol-Gel method has some advantages over the conventional method. For example, the synthesis is done at the molecular leval producing very pure products and the synthesis temperature can be lower. In this paper, SrAl2O4:Eu2+,Dy3+ phosphor with good photoluminescence properties was synthesized successfully through Sol-Gel method. Be compared with conventional solid state method, the reaction temperature can be greatly decreased. The grain size of the sample is small- and well distributed. As we know now, SrAl2O4:Eu2+,Dy3+ nano-particle phosphor through Sol-Gel method hasn't been reported yet. This paper firstly puts forward that SrAl2O4:Eu2+Dy3+ nano-particle phosphor can be prepared through Sol-Gel method.In this paper, a series of preparation conditions with Sol-Gel method were systematically studied. It is concerned with the effect of pH on the sol and gel formation and quality and the effect of sintering temperature and time on the luminescence properties and grain size of the samples. At the same time, the phosphorescent mechanism was discussed.XRD patterns, SEM and TEM photos, excitation spectrum, emission spectrum, decay curves and TG-DTA curves have been measured on the sample. SrAl2O4:Eu2+,Dy3+ nano-particle phosphor synthesized is withmonoclinic SrAl2O4 crystal structure. Excitation spectumn is a broad band peaking at 240,330,378 and 425nm. Emission spectrum is also a broad band peaking at 523nm. The samples show afterglow luminescence for a verylong time. The grain size is small and well distributed. The sintering temperature is lower. The SrAl2O4:Eu2+,Dy3+ nano-particle phosphor was successfully prepared by the Sol-Gel method. This will not only develop a new synthesis technology but also begin a new field of studying various properties of SrAl2O4:Eu2+,Dy3+ on nanometer size particles.