Er3+-Tm3+-Yb3+掺杂Bi4Ti3O12薄膜的上转换白色荧光和铁电性能

金属学报, 2014, 50(1): 88-94. doi: 10.3724/SP.J.1037.2013.00503

Er3+-Tm3+-Yb3+掺杂Bi4Ti3O12薄膜的上转换白色荧光和铁电性能

1.东北大学机械工程与自动化学院,沈阳,110819

2.东北大学理学院,沈阳110819;东北大学研究院,沈阳110819

3.东北大学机械工程与自动化学院,沈阳,110819

4.东北大学机械工程与自动化学院,沈阳,110819

基金项目: Programs for Science and Technology Development of Liaoning Province(2012216033) Fundamental Research Funds for the Central Universities(N120403013) 辽宁省科技攻关计划项目2012216033,中央高校基本科研业务费资助项目N120403013,沈阳市科技攻关计划项目F11-174-9-00和沈阳市科技计划项目F12-277-1-60资助 Science and Technology Plan Project of Shenyang(F12-277-1-60) Programs for Science and Technology Development of Shenyang(Fll-174-9-00)

关键词：白色荧光 , 铁电性能 , 上转换 , 薄膜

UPCONVERSION WHITE PHOTOLUMINESCENCE AND FERROELECTRIC PROPERTY FOR Er3+-Tm3+-Yb3+ TRI-CODOPED Bi4Ti3O12 THIN FILM

Keywords： white photoluminescence , ferroelectric property , upconversion , thin film

通过化学溶液沉积法制备了Er3-Tm3+-Yb3+共掺杂的Bi4Ti3O12薄膜,并研究了薄膜的上转换荧光和铁电性能.在980 nm红外光的激发下,薄膜的室温发射光谱在可见光区域显示出4个发射带,分别是峰值为478 nm的蓝光发射带,对应Tm3+的1G4→3H6能级跃迁;峰值为527和548 nm的绿光发射带,对应Er3+的2H11/2→4I15/2和4S3/2→4I15/2能级跃迁;峰值为657 nm的红光发射带,由Er3+的4F9/2→4I15/2和Tm3+的1G4→3F4能级跃迁产生的发射带复合而成.荧光的颜色可以通过改变Er3+,Tm3+,Yb3+离子的掺杂浓度加以调节.在固定Tm3+,Yb3+浓度的Bi3.59-xErxTm001Yb04Ti3O12(BErxTYT)薄膜中,随着Er3+浓度的增加,红、蓝光和绿、蓝光的强度比均增加,Er3+离子的淬灭浓度为1.75‰(摩尔分数,下同);在固定Er3+,Yb3+浓度的Bi3.593-yEr0.007TmyYb0.4Ti3O12(BETmyYT)薄膜中,随着Tm3+浓度的增加,绿、蓝光和红、蓝光的强度比均降低,Tm3+的淬灭浓度为2.5‰;在固定Er3+,Tm3+浓度的Bi3.98-zEr0.01Tm0.01YbzTi3O12(BETYbzT)薄膜中,随着Yb3+浓度的增加,蓝、绿光和红、绿光的强度比均增加,Yb3+对Er3+发射的荧光淬灭浓度小于5％,而对Tm3+发射的荧光淬灭浓度大于18％.Bi3.5815Er0.0085Tm0.01Yb0.4Ti3O12薄膜上转换荧光值为(0.31,0.34),最接近标准白光的色度坐标(0.33,0.33).在不同功率的红外激光激发下,薄膜荧光的色度坐标变化幅度很小,说明薄膜具有较好的颜色稳定性.通过分析薄膜荧光的上转换机制,从Er3+向Tm3+有明显的能量传递发生,使光谱中红、绿、蓝光的相对强度和稀土离子的淬灭浓度发生明显变化.薄膜的铁电性能测试表明,当Er3+,Tm3-,Yb3+掺杂的总浓度约为10％时(Bi3.5815Er0.0085Tm0.01Yb0.4Ti3O12),薄膜的铁电剩余极化强度达到最大值,为27.8 μC/cm2.

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