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《Journal of Functional Materials and Devices》 2003-04
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Effect of Pr~(3+) molar ratio on CaTiO_3:Pr~(3+) red phosphor

YANG Zhi - ping , GUO Zhi , WANG Wen - jie, ZHU Sheng - chao (Physics Science and Technology College, Hebei University, Baoding 071002, China)  
Synthesis of CaTiO3:Pr3+ red long afterglow phosphor with different Pr3+ molar ratio by flux fusion method were presented. Their afterglow decay curves were measured. The afterglow time is over 40 min with Pr3+ 0. 1%. With the increase of Pr3+ molar ratio, the afterglow time deteriorates rapidly. The initial brightness is associated with Pr3+ molar ratio, with Pr3 + 0. 2%, the phosphor gets the highest initial brightness. The excitation spectra and emission spectra were measured. The emission peak is at 613nm which is ascribed to the energy transition of 1D2 -3H4. Due to the function of weak crystal field, the main emission divides into 612nm and 614nm. Besides the main emission peak, phosphor has a shoulder emission peak at 620 - 628nm. Alteration of Pr3 + molar ratio has little effect on the emission spectra, but with Pr3 + 0. 2%, phosphor gets a emission peak at 626nm. The excita -tion peak is at 342nm, with a shoulder peak at 400nm. The thermoluminescence glow curves of -phosphor were measured. The phosphor has three thermal peaks at 150K, 250K and 330K. With the increase of Pr3 + molar ratio, the thermal peak at 330K deteriorates distinctly. The afterglow charac -teristic of phosphor is associated with the thermal peak at 330K.
【Fund】: 河北科学技术发展项目(51215103b)
【CateGory Index】: TB39
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