期刊文献+
共找到3篇文章
< 1 >
每页显示 20 50 100
双掺Eu^(3+)和Tb^(3+)的下转换β-NaYF_4的合成与发光性能 被引量:5
1
作者 蒋晨飞 黄文娟 +4 位作者 丁明烨 宋艳 倪亚茹 陆春华 许仲梓 《发光学报》 EI CAS CSCD 北大核心 2012年第7期683-687,共5页
采用高温溶剂热法合成了下转换发光材料NaYF4∶Eu3+和NaYF4∶Eu3+,Tb3+,采用X射线衍射(XRD)、场发射扫描电镜(FESEM)、激发(PLE)谱和光致发光(PL)谱对材料的物相结构、形貌特征和发光性质进行了表征和研究,并分析了其发光原理。结果表明... 采用高温溶剂热法合成了下转换发光材料NaYF4∶Eu3+和NaYF4∶Eu3+,Tb3+,采用X射线衍射(XRD)、场发射扫描电镜(FESEM)、激发(PLE)谱和光致发光(PL)谱对材料的物相结构、形貌特征和发光性质进行了表征和研究,并分析了其发光原理。结果表明:所合成的NaYF4∶Eu3+和NaYF4∶Eu3+,Tb3+为纯六方相晶体,尺寸在100 nm左右;改变Eu3+和Tb3+的掺杂浓度后晶格结构没有发生明显变化,说明Eu3+和Tb3+取代的是Y3+的晶格位置;在394 nm光的激发下,检测到Eu3+在5D0→7F1和5D0→7F2跃迁处的特征发射光,并且可见光强度随着Eu3+离子掺杂浓度的变化而变化。另外Tb3+离子浓度对NaYF4∶Eu3+晶体结构产生了一定的影响,说明掺杂Tb3+离子改变了Eu3+离子所处的配位环境,导致红色发光带增强,而这主要源于电偶极子跃迁的贡献。 展开更多
关键词 下转换 β-NaYF4 高温溶剂热法 偶极子跃迁
下载PDF
Ab Initio Calculation on Spectroscopic Properties and Radiative Lifetimes of Low-Lying Excited States of NaK
2
作者 Shi-yang Zhang Feng Xie +5 位作者 Feng-dong Jia Xiao-kang Li Ru-quan Wang Rui Li Yong Wu Zhi-ping Zhong 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2019年第6期667-673,I0002,共8页
We performed high-level ab initio calculations on electronic structure of Na K. The potential energy curves (PECs) of 10 Λ-S states correlated with the three lowest dissociation limits have been calculated. On the ba... We performed high-level ab initio calculations on electronic structure of Na K. The potential energy curves (PECs) of 10 Λ-S states correlated with the three lowest dissociation limits have been calculated. On the basis of the calculated PECs, the spectroscopic constants of the boundΛ-S states are obtained, which are in good agreement with experimental results. The maximum vibrational quantum numbers of the singlet ground state X^1Σ^+ and the triplet ground state a^3Σ^+ have been analyzed with the semiclassical scattering theory. Transition properties including transition dipole moments, Franck-Condon factors, and radiative lifetimes have been investigated. The research results indicate that such calculations can provide fairly reliable estimation of parameters for the ultracold alkali diatomic molecular experiment. 展开更多
关键词 Ultracold dipolar molecule Transition dipole moment Spectroscopic constants Potential curves
下载PDF
Photon retention in coherently excited nitrogen ions 被引量:4
3
作者 Jinping Yao Luojia Wang +12 位作者 Jinming Chen Yuexin Wan Zhihao Zhang Fangbo Zhang Lingling Qiao Shupeng Yu Botao Fu Zengxiu Zhao Chengyin Wu Vladislav VYakovlev Luqi Yuan Xianfeng Chen Ya Cheng 《Science Bulletin》 SCIE EI CSCD 2021年第15期1511-1517,M0003,共8页
Quantum coherence in quantum optics is an essential part of optical information processing and light manipulation.Alkali metal vapors,despite the numerous shortcomings,are traditionally used in quantum optics as a wor... Quantum coherence in quantum optics is an essential part of optical information processing and light manipulation.Alkali metal vapors,despite the numerous shortcomings,are traditionally used in quantum optics as a working medium due to convenient near-infrared excitation,strong dipole transitions and long-lived coherence.Here,we proposed and experimentally demonstrated photon retention and subsequent re-emittance with the quantum coherence in a system of coherently excited molecular nitrogen ions(N_(2)^(+))which are produced using a strong 800 nm femtosecond laser pulse.Such photon retention,facilitated by quantum coherence,keeps releasing directly-unmeasurable coherent photons for tens of picoseconds,but is able to be read out by a time-delayed femtosecond pulse centered at 1580 nm via two-photon resonant absorption,resulting in a strong radiation at 329.3 nm.We reveal a pivotal role of the excited-state population to transmit such extremely weak re-emitted photons in this system.This new finding unveils the nature of the coherent quantum control in N_(2)^(+)for the potential platform for optical information storage in the remote atmosphere,and facilitates further exploration of fundamental interactions in the quantum optical platform with strong-field ionized molecules. 展开更多
关键词 Quantum coherence Photon retention Coherent quantum control Strong-field ionized molecules
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部