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OALib Journal期刊
ISSN: 2333-9721
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Er3+-Tm3+-Yb3+掺杂Bi4Ti3O12薄膜的上转换白色荧光和铁电性能*
DOI: 10.3724/SP.J.1037.2013.00503, PP. 88-94
Keywords: 白色荧光,铁电性能,上转换,薄膜
Abstract:
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980nm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478nm的蓝光发射带,对应Tm3+的1G4→3H6能级跃迁;峰值为527和548nm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657nm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-xErxTm0.01Yb0.4Ti3O12(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27.8μC/cm2.
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