Synthesis Of Rare Earth Doped Aluminate Phosphors Via Co-Precipitation Method With Metal Chloride

Rare earth doped aluminates have emerged as a new class of luminescence materials,showing merits of high stability,brightness,and flexible industrial processing ability that are suitable for lighting and dispiay devices. To meet the requirements of the development of more high-tech devices, carry out the research on efficient and refinement luminescent material has very important significance.BAM powders have been rapidly prepared at1250℃by the chemical coprecipitation, with metal chloride and rare earth solution. Obtained the pure phase and small particles phosphor materials. BAM show high quantum efficiency and luminescent properties under the excitation of ultraviolet (UV) light.The emission spectrum of (?) BAM consists of a wide band with the peak at450nm,belong to the blue emission.The use of H3BO3as flux can help to crystallize the phosphor, and enhances the intensities of excitation and emission spectra of BAM. The optimum content of H3BO3is about3.0wt.%, which increased the relative emission intensity of BAM over25%.In appropriate Eu2+doping concentration range, the intensity of the fluorescence of BAM is increased obviously with increasing the Eu2+doping concentration, owing to adding the number of luminescent centers and enhancing the energy transfer between Eu2+ions. The maximum emission intensity is reached when Eu2+molar concentration is0.16;In the same way,prepared the CaAl2O4:Eu3+red phosphors at1200℃. The results of XRD and TEM analysis show the sample is monophasic and well-crystallized, in which displace as well as twin crystal do not exist.Study the common doping mechanism of Li+and Eu3+in CaAl2O4mainly, found that the charge compensation effect of Li+makes the structure more stable,and the luminous intensity increased by10%.