| With the development of lighting technology, more efforts have been done onimproving the lifetime, brightness and color richness of the light source during thepast decades. Rare earth metal doped borophosphates absorb more eyes as newluminescence materials in recent years because of their larger color coordinate values,higher luminescent intensity and low heat quenching.Rare earth borophosphates have been considered as a potential mass forluminescence materials. In previous study of our group, the first rare-earthborophosphate K6Lu3B2P7O28has been synthesized under boric acid flux conditions.Here, we try to prepare its isostructural compound Na6Lu3B2P7O28by using solid statemethod. And then, further study on their luminescence of samples doped with variousrare earth will carry on, which purposes to look for new luminescent materials. Thehigh temperature treatment includes two stages: preheating at low temperature andsintering at high temperature. The experimental conditions such as mole ratio of rawmaterials and the heating temperature have been discussed and the phase compositionof the product has been analysized by XRD. The results showed that Na6Lu3B2P7O28can be prepared under the high-temperature solid state conditions, but LuPO4asimpurity is also existed in the product. The effect of NaF as flux is investigated in theexperimental process, and find that Na6Lu3B2P7O28pure phase can be obtainedsuccessfully by adding4%NaF. The optimum experiment conditions are as follows:preheating temperature is400℃, sintering temperature is630℃, the mole ratio of rawmaterials is NaLuF4:H3BO3:NaNO3: NH4H2PO4=3.3:3.5:2.5:8and the mass fractionof NaF is4%.The luminescent property of Na6Lu3B2P7O28doped by Ce3+, Dy3+, Tb3+have beenresearched by the luminescent spectra. The results showed that Na6Lu3B2P7O2:Ce3+can emit a broad band from350nm to450nm when excited by325nm. The mainpeak is located at360nm. Na6Lu3B2P7O2:Dy3+has blue emission (483nm) and yeloow emission (575nm), which is corresponding to the electric transfer of4F9/2→6H15/2and4F9/2→6H13/2of Dy3+, respectively. Na6Lu3B2P7O2:Tb3+can emitstrong blue light as excited by UV light。Based on the luminescent results of dopingamount of rare earth ions, the optimum mole ratios of Ce3+, Dy3+, Tb3+are0.01mol,0.07mol,0.09mol. |
