Synthesis And Optical Spectroscopy Research Of Rare Earth Doped SrLaAlO₄Phosphor

Luminescent materials plays a very important role in modern production of life,Rare-earth luminescent materials are one important part of luminescent materials.White LED is a new generation of solid lighting source and has wide applications dueto their small volume, long life, environmental protection and energysaving.Aluminum fluorescent material with the properties, such as chemical stability,is one of an important part of white LED. In this thesis, the rare earth doped SrLaAlO₄luminescence materials were synthesized by high temperature solid-state reaction andits luminescence properties were investigated.The major research contents and the conclusions were as follows：Firstly, The SrLa_1-xAlO₄:xDy³⁺phosphor was investigated. The emissionspectrum shows several bands at484nm,578nm and669nm under the excitation ofthe352nm. CIE chromaticity coordinates of SrLa_1-xAlO₄:xDy³⁺indicate thatSrLa_1-xAlO₄:xDy³⁺could be a promising singer matrix white phosphor．The effects ofDy³⁺content on the luminescent intensity of484nm of the phosphor were investigatedunder the excitation of the365nm. The result shows that the optimum concentrationof Dy³⁺in SrLa_1-xAlO₄is x=3mol%. The concentration quenching mechanisms are thedipole-dipole interaction.Secondly, The SrLa_1-xAlO₄:xEu³⁺phosphor was investigated. The emissionspectrum shows several bands at537nm，558nm，593nm，621nm，702nm under theexcitation of the305nm.The intensity of SrLa_1-xAlO₄:xEu³⁺obviously improved asconcentration of Eu³⁺was increased and reach the maximum when x=0.09.Finally, The SrLa_1-xAlO₄:xSm³⁺phosphor was investigated. The emissionspectrum shows several bands at567nm，601nm，648nm，710nm under the excitationof the408nm.The effects of Sm³⁺content on the luminescent intensity of601nm ofthe phosphor were investigated under the excitation of the408nm. The result showsthat the optimum concentration of Sm³⁺in SrLa_1-xAlO₄is x=1mol%. Theconcentration quenching mechanisms are the dipole-dipole interaction.