时间分辨荧光光谱研究铁电材料锶钡铌氧(SBN)及铬离子掺杂的锶钡铌氧(SBN：Cr(3＋))的荧光热猝灭和光猝灭  

The Research on Thermal and Light-Induced Photoluminescence Quenching Effectin Ferroelectric Pure and Cr^(3+) ion Doped SBN by Time-Resolved Photoluminescence Spectroscopy

作　　者：范大勇[1,2] 王秀丽[1] 冯兆池[1] 李灿[1] FAN Da-yong WANG Xiu-li FENG Zhao-chi LI Can(State Key Laboratory of Catalysisc-Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China University of Chinese Academy of Sciences, Beijing 100049, China)

机构地区：[1]中国科学院大连化学物理研究所,催化基础国家重点实验室&洁净能源国家实验室,大连116023 [2]中国科学院大学,北京100049

出　　处：《光散射学报》2016年第3期259-263,共5页The Journal of Light Scattering

基　　金：973项目基金(2014CB239400);国家自然科学基金(21203185)

摘　　要：本文使用稳态及时间分辨荧光光谱法对陶瓷相铁电材料Sr_xBa_(1-x)Nb_2O_6(SBN-x)及Cr^(3+)掺杂的Sr_xBa_(1-x)Nb_2O_6(SBN:Cr^(3+))的光生载流子的复合动力学进行了研究。带边激发条件下SBN-70非辐射复合过程在温度高于137K时已快于辐射复合,说明SBN在765nm处对应的发光中心极容易受到晶格振动影响,使激发态电子转而通过声子参与的无辐射跃迁回到基态。对于Cr^(3+)离子掺杂的SBN-70,使用395nm和480nm激发得到发光中心的热激活能分别为Ea=380.9±61.0meV和Ea=374.6±51.4meV。发现了SBN低温下很强的光致荧光猝灭性质,其产生原因可能归属为样品对激发光的吸收造成的捕获电子态对发光的二次吸收。The recombination dynamics of photo-excited carrier in ferroelectric ceramic Sr_xBa_（1-x）Nb_2O_6 was studied by steady state and time-resolved photoluminescence spectroscopy.Under excitation by 395 nm in the absorption edge region,the non-radiative process became faster than the radiative process when the measurement temperatures of Sr_（0.7）Ba_（0.3）Nb_2O_6（SBN-70）ceramic above 137 K.This result means that the fluorescence（765nm）in pure SBN can be easily quenched by phonon,resulting in the excited electrons de-excited to ground state mainly by phonon-assisted non-radiative process but not by photoluminescence.The thermal activation energy of the fluorescence center in Cr（3＋）ion doped SBN is 380.9±61.0meV and 374.6±51.4meV,excited at 395 nm and 480 nm respectively.We have found a strong light-induced luminescence quenching effect in SBN ceramic under low temperature,which may be due to the reabsorption of the photo-induced electron trap states.

关 键 词：SrxBa1-xNb2O6 荧光热猝灭 光致荧光猝灭 

分 类 号：O482.31[理学—固体物理]