Research On Relationship Of Structure And Luminescence Properties Of YAG: Eu³⁺

White light—emitting diode(LED) is commonly considered as the leading and valuable light source in the 21st century owing to its excellent advantages than others,it will replace incandescent lamp and fluorescent bulb,so it has attracted much attention and becomes one of the objects many researchers are seeking.Yttrium aluminum garnet (Y₃Al₅O₁₂,YAG) is a very important fluorescence material.In this thesis,the synthesis and relationship between the structure and luminous properties of(Y_1-xEu)x)3Al₅O₁₂(x= 0.00～0.10) is discussed.Compared the methods of synthesizing phosphors at present day,the(Y_1-xEu)x)3Al₅O₁₂ phosphor was synthesized by gel-combustion method.The XRD structure of phosphors was analysis which made at different sintering temperatures and different Eu³⁺ doped. (Y_1-xEu)x)3Al₅O₁₂ phosphor is single phase of cubic(Ia3d) which sintered at 900℃,and the higher sintering temperature,the better crystallinity of the phosphor;then the XRD data was refined by Rietveld method of whole pattem fitting by using the computer progress of FullProf,the lattice parameters increase with increasing of x.Fluorescence spectroscopy shows that,the main peak of(Y_1-xEu)x)3Al₅O₁₂ phosphor excitation spectra is around 394nm which is ⁷F₀-⁵L₆ transition,it is characteristic absorption lines of Eu³⁺.Its emission band is at 591nm which belongs to ⁵D₀-⁷F₁ transition.It reveals that crystal structure and fluorescence emission intensity changes in same trends after compared them, in addition to x = 0.10 which appear the concentration quenching,the structures and the luminous properties of other samples change in similar trend.The relationship between the structure and luminous properties of(Y_1-xEu)x)3Al₅O₁₂ is discussed.