Er^(3+)-Tm^(3+)-Yb^(3+)掺杂Bi_4Ti_3O_(12)薄膜的上转换白色荧光和铁电性能  

UPCONVERSION WHITE PHOTOLUMINESCENCE AND FERROELECTRIC PROPERTY FOR Er^(3+)-Tm^(3+)Yb^(3+) TRI-CODOPED Bi_4Ti_3O_(12) THIN FILM

作　　者：孙丽娜[1] 谭俊[2,3] 巴德纯[1] 原培新[1] 

机构地区：[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 [3]东北大学研究院,沈阳110819

出　　处：《金属学报》2014年第1期88-94,共7页Acta Metallurgica Sinica

基　　金：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;沈阳市科技计划项目F12-277-1-60资助~~

摘　　要：通过化学溶液沉积法制备了Er^(3+)-Tm^(3+)-Yb^(3+)共掺杂的Bi_4Ti_3O_(12)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岀4个发射带,分别是峰值为478 nm的蓝光发射带,对应Tm^(3+)的~1G_4→~3H_6能级跃迁;峰值为527和548 nm的绿光发射带,对应Er^(3+)的~2H_(11/2)→~4I_(15/2)和~4S1/2→~4I_(15/2)能级跃迁;峰值为657 nm的红光发射带,由Er^(3+)的~4F_(9/2)→~4I_(15/2)和Tm^(3-)的~1G_4→~3F_4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Er^(3-),Tm^(3+),Yb^(3+)离子的掺杂浓度加以调节.在固定Tm^(3+),Yb^(3-)浓度的Bi_(3.59-x)Er_xTm_(0.01)Yb_(0.4)Ti_3O_(12)(BEr,TYT)薄膜中,随着Er^(3+)浓度的增加,红、蓝光和绿、蓝光的强度比均增加,Er^(3+)离子的淬灭浓度为1.75‰(摩尔分数,下同);在固定Er^(3+),Yb^(3+)浓度的Bi_(3.593-y)Er_(0.007)Tm_yYb_(0.4)Ti_1O_(12)(BETm_yYT]薄膜中,随着Tm^(3+)浓度的增加,绿、蓝光和红、蓝光的强度比均降低,Tm^(3+)的淬灭浓度为2.5‰;在固定Er^(3-),Tm^(3+)浓度的Bi_(3.98-x)Er_(0.01)Tm_(0.01)Yb,Ti_3O_(12)(BETYb,T)薄膜中,随着Yb^(3+)浓度的增加,蓝、绿光和红、绿光的强度比均增加,Yb^(3-)对Er^(3-)发射的荧光淬灭浓度小于5%,而对Tm^(3-)发射的荧光淬灭浓度大于18%.Bi_(3.5#15)Er_(0.0045)Tm_(0.01)Yb_(0.4)Ti_3O_(12)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Er^(3+)向Tm^(3-)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有,当Er^(3+),Tm^(3+),Yb^(3+)掺杂的总浓度约为10%时(Bi_(3.5815)Er_(0.0085)Tm_(0.01)Yb_(0.4)Ti_3O_(12),薄膜的铁电剩余极化强度达到最大值,为27.8μC/cm^2.The Er3＋-Tm3＋-yb3＋ tri-codoped Bi4Ti3O12 thin films were prepared by chemical solution deposition method and its upconversion （UC） photoluminescence and ferroelectric properties were studied. There are four emission bands in the visible UC luminescence spectra excited by 980 nm infrared light at room temperature. The 478 nm blue emission band corresponds to 1G4→3H6 transition of Tm3＋, and the 527, 548 nm green emission bands correspond 2H11/2→4I15/2 and 4S3/2→4I15/2 transitions of Er3＋, and the 657 nm red emission band corresponds to 4F9/2→4I15/2 transition of Er3＋ and 1G4→3F4 transition of Tm3＋. The fluorescent color can be tuned by adjusting Er3＋, Tm3＋ and Yb3＋ concentrations. For Bi3.59-xErxTm0.01Yb0.4Ti3O12（BErxTYT） thin films with fixed Tm3＋ and Yb3＋ concentrations, the intensity ratio of green and red emissions to blue one gradually increased with the increase of Er3＋ concentrations, and the quenching concentration of Er3＋ is only about 1.75 ‰ （mole fraction）. For Bi3.593-yEr0.007TmyYb0.4Ti3O12（BETmyYT） thin films with fixed Er3＋ and Yb3＋ concentrations, the intensity ratio of green and red emissions to blue one decreased with the increase of Tm3＋ concentrations, and Tm3＋ quenching con- centration is about 2.5%0. For Bi3.98-xEr0.01Tm0.01YbzTi3O12（BETYbzT） thin films with fixed Er3＋ and Tm3＋ concentra- tions, the intensity ratio of blue or red emission to green one increase with increase of Yb3＋ concentrations, and Yb3＋ quenching concentration is less than 5 mol% for the luminescence from Er3＋ and lager than 18 mol% for the lumi- nescence from Tm3＋. The optimal color coordinate in these films is （0.31, 0.34）, close to standard white-light coordi- nate of （0.33, 0.33）, which appears in Bi3.5815Er0.0085Tm0.01Yb0.4Ti3O12 thin film. The color coordinate has only a little change with increasing pumping power, which suggests that luminescence from the thin films has good color stabil- ity. There exist significant energy transf

关 键 词：白色荧光 铁电性能 上转换 薄膜 

分 类 号：O484.4[理学—固体物理]