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《Chinese Journal of Luminescence》 2006-02
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Effect of Urea's Quantity on the Afterglow Characteristic of CaAl_2O_4 ∶Eu~(2+),Nd~(3+) Phosphor Prepared by Combustion Synthesis

YANG Zhi-ping~1,YANG Yong~1,LI Xing-min~1, LI Xu~2,LI Pan-lai~1(1.College of Physics Science and Technology;2.College of Eletronic and Informational Engineering,Hebei University,Baoding 071002,China)  
The afterglow phosphor CaAl_2O_4 ∶Eu~(2+),Nd~(3+) is prepared utilizing the redox reaction of respective metal nitrates and urea by combustion synthesis with ignition temperatures of 600 ℃.The X-ray diffraction(analysis) showed that it is coincident with the JCPDS Card(No.23-1036) and its crystal structure is CaAl_2O_4 which belongs to monoclinic phase and the crystal lattice constant is as follows: a=0.869 8 nm,b=0.809 2 nm,c=1.520 8 nm.With the invariable concentration of metallic ions nitrate,a series of phosphor samples were synthesized by altering the ratio of urea and nitrate.The emission spectra and excitation spectra of the phosphor were investigated.The excitation spectra of CaAl_2O_4 ∶Eu~(2+),Nd~(3+) showed a double peak broadband structure.The main peak located at 352 nm and a shoulder peak at 266 nm.The quantity of urea has obvious influence on the emission spectrum of CaAl_2O_4 ∶Eu~(2+),Nd~(3+).When the quantity of urea exceed double of theoretic quantity,adequate reducing gas produced in the process of combustion reaction benefit to the form of Eu~(2+) luminescent center,so emission spectra of CaAl_2O_4 ∶Eu~(2+),Nd~(3+) consist of characteristic broad band emission of Eu~(2+).Contrast this,inadequate reducing gas benefit to form of Eu~(3+) luminescent center,so when the quantity of urea less than double of theoretic quantity,the emission spectra exhibit characteristic narrowband emission of Eu~(3+).The samples are fired at 1 000 ℃ for 2 h in an active carbon atmosphere in order to deoxidize residual Eu~(3+) to Eu~(2+) and eliminate impurity brought by combustion synthesis.This is beneficial to promote the(performance) of luminescence.The decay curves of phosphor with different quantity of urea were measured.The change of urea's quantity affected on the afterglow character of CaAl_2O_4 ∶Eu~(2+),Nd~(3+) distinctly and the optimal quantity of urea is(5 times) of theoretic quantity.When more urea was used in the experiment,the luminescent intensity will(decrease) and the lasting time will be shorten.
【Fund】: 河北科学技术发展资助项目(51215103b)
【CateGory Index】: O482.31
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