基于深亚波长双层媒质的钙钛矿量子点荧光增强  

Photoluminescence Enhancement of CsPbBr_(3) Perovskite Quantum Dots Based on Deep-subwavelength Bilayer Media

作　　者：赵文超 文政绩 周子骥 谈冲 李世民 孙艳[1] 戴宁[1,4] 郝加明 ZHAO Wen-chao;WEN Zheng-ji;ZHOU Zi-ji;TAN Chong;LI Shi-min;SUN Yan;DAI Ning;HAO Jia-ming(State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China;Department of Electronics and Information, Huzhou University, Huzhou 313000, China;University of Chinese Academy of Sciences, Beijing 100049, China;College of Physics and Optoelectronic Engineering, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China;School of Physics Science and Engineering, Tongji University, Shanghai 200092, China)

机构地区：[1]中国科学院上海技术物理研究所红外物理国家重点实验室,上海200083 [2]湖州学院电子与信息系,浙江湖州313000 [3]中国科学院大学,北京100049 [4]国科大杭州高等研究院物理与光电工程学院,浙江杭州310024 [5]同济大学物理科学与工程学院,上海200092

出　　处：《发光学报》2021年第9期1403-1411,共9页Chinese Journal of Luminescence

基　　金：国家重点研发计划(2017YFA0205800);国家自然科学基金(62075231,61471345);上海市科技委员会基金项目(20JC1414603)资助。

摘　　要：近年来,利用金属纳米结构表面等离激元共振提高半导体材料的发光效率取得了重要进展,但是相关结构体系面临着加工技术复杂、重复性差等缺点。本文报道了一种新型超薄、大面积、共振可调的平面双层纳米媒质用于增强量子点发光,其结构由深亚波长厚度、高吸收率特性的氧化铜(CuO)薄膜和金(Au)薄膜构成。实验结果显示,通过改变CuO薄膜厚度可以灵活调节CuO/Au双层堆栈结构的反射光谱,以其为基底旋涂CsPbBr_(3)钙钛矿量子点后与裸石英旋涂CsPbBr_(3)量子点参考样品相比实现了最大7倍的荧光发光增强。理论分析表明,荧光增强效应与强光学非对称法布里-珀罗薄膜干涉引起的高效光吸收和局域场增强导致的自发辐射速率加快相关。In recent years,great strides have been made in improving the luminous efficiency of semiconductor materials by using surface plasmon resonance.However,there still exist some disadvantages,such as sophisticated nanofabrication techniques,poor repeatability and so on.Here,a novel ultra-thin,large-area and tunable planar bilayer media is reported,which is composed of deep-subwavelength and high absorptive CuO thin films and Au substrate.Experimental results show that reflectance spectra of CuO/Au bilayer can be sensitively tuned by changing the thickness of CuO film.Compared with the bare quartz based reference sample,photoluminescence(PL)enhancement factor of quantum dots/CuO/Au trilayer can be achieved by up to 7 times.Theoretical analysis shows that PL enhancement effect is attributed to the high efficient absorption caused by Fabry-Perot thin film interference and the accelerated spontaneous emission rate resulted from local field enhancement.

关 键 词：荧光增强 CsPbBr_(3)量子点 深亚波长 F-P干涉 自发辐射速率 

分 类 号：O482.31[理学—固体物理] O433[理学—物理]