Gd_2O_3中掺杂Eu^(3+)和Yb^(3+)荧光粉的制备及荧光性能

Preparation and Spectroscopic Characterization of Eu^(3+) and Yb^(3+) Doped Gd_2O_3 Phosphors

采用溶胶-凝胶法制备了Gd2O3∶Eu3+,Gd2O3∶Yb3+与Gd2O3∶Eu3+,Yb3+荧光粉,对制备条件进行了研究,且进行了样品的物相表征.结果表明,Yb3+在高掺杂浓度下存在浓度猝灭,Eu3+可以通过共合作能量传递过程和交叉弛豫过程有效地将能量传递给临近的一对Yb3+离子.Gd2O3∶Eu3+,Yb3+在Eu3+的特征激发峰314 nm激发时,可以产生550~750 nm的Eu3+的特征发射和900~1100 nm的Yb3+近红外特征发射两个波段光谱.制备的Gd2O3∶Eu3+,Yb3+荧光粉可以将硅太阳能电池吸收较弱的300~550 nm的高能光子转换为两个响应较好的近红外光子.

Gd2O3∶ Eu^3＋,Gd2O3∶ Yb^3 ＋and Gd2O3∶ Eu^3＋,Yb^3 ＋phosphors were prepared by sol-gel method. The influence of preparing condition was studied,and their structures were characterized. The results showed that the concentration quenching phenomenon should take place if the concentration of Yb^3 ＋is high. Eu^3＋could transfer energy to adjacent Yb3 ＋ions effectively through cooperative energy transfer process and the cross relaxation process. Upon excitation of the characteristic excitation of Eu^3＋at 314 nm,the characteristic emission of Eu^3＋from 550 - 750 nm and NIR emissions of Yb^3 ＋characteristic emission from 900 - 1100 nm were obtained. The obtained Gd2O3∶ Eu^3＋,Yb^3 ＋phosphors could transfer 300 - 550 nm high-energy photon which was weaker to NIR photon which was obsorbed strongly,which could improve the photovoltaic efficiency of the Si-solar cell.