金纳米粒子修饰氧化铟锡阳极的高效率红光钙钛矿发光二极管  

Gold nanoparticals modified indium tin oxide anode for high performance red perovskite light emitting diodes

作　　者：许青林 项婷 徐伟 李婷 吴小龑 李巍 邱学军 陈平[1] Xu Qing-Lin;Xiang Ting;Xu Wei;Li Ting;Wu Xiao-Yan;Li Wei;Qiu Xue-Jun;Chen Ping(School of Physical Science and Technology,Southwest University,Chongqing 400715,China;Key Laboratory of Science and Technology on High Energy Laser,Institute of Fluid Physics,China Academy of Engineering Physics,Mianyang 621900,China;Guangdong Engineering Research Center for Light and Health,Guangdong Pharmaceutical University,Guangzhou 510315,China)

机构地区：[1]西南大学物理科学与技术学院,重庆400715 [2]中国工程物理研究院流体物理研究所,高能激光科学与技术重点实验室,绵阳621900 [3]广东药科大学,广东省光与健康工程技术研究中心,广州510315

出　　处：《物理学报》2021年第20期342-352,共11页Acta Physica Sinica

基　　金：重庆市自然科学基金(批准号:cstc2019jcyj-msxmX0015);重庆市大学生创新创业训练计划(批准号:S202010635022)资助的课题。

摘　　要：金纳米颗粒对提升钙钛矿发光二极管的外量子效率有重要作用.为了避免金纳米颗粒与发光层直接接触,先前工作合成的Au NPs@SiO_(2)影响器件电荷传输且不易合成;而将金纳米颗粒共混在聚(3,4-乙烯二氧噻吩):聚(苯乙烯磺酸酯)中时,金纳米密度又不易控制,不适合做理想的空穴传输层.于是,本文采用静电吸附的方法将粒径约20 nm的金纳米颗粒均匀地修饰在氧化铟锡阳极上,并采用聚(9-乙烯基咔唑)作为空穴传输层,使红光(NMA)_(2)Cs_(n–1)Pb_(n)I3_(n+1)钙钛矿发光二极管的最大发光亮度从未修饰金纳米颗粒前的约5.2上升到约83.2 cd/m^(2),最大外量子效率从约0.255%上升到约6.98%.机理研究表明,金纳米颗粒修饰的氧化铟锡电极与铝电极之间可以形成光学微腔.利用微腔中的透射光与反射光相互作用,可以增强器件整体的耦合出光效率.金纳米颗粒修饰的(NMA)_(2)Cs_(n–1)Pb_(n) I_(3n+1)钙钛矿器件荧光光谱和荧光强度随角度关系,证明了该微腔效应是导致(NMA)_(2)Cs_(n–1)Pb_(n)I_(3n+1)钙钛矿荧光增强的主要机制.其次,对金纳米颗粒密度对器件发光特性进行探究,发现约15 min吸附时间的器件性能最优.最后,本文论证了金纳米颗粒对钙钛矿薄膜形貌、结晶、电学性能的影响和金纳米颗粒等离子体共振效应不是主要机制.本工作将金纳米颗粒成功应用于红光钙钛矿发光二极管,为将来进一步探索低成本、高效率的钙钛矿发光二极管提供了一种可行的研究思路.Gold nanoparticles(Au NPs)play an important role in improving the external quantum efficiency of perovskite light emitting diodes(PeLED).To avoid direct contact between the Au NPs and the light emitting layer,the Au NPs@SiO_(2) structure and blending the Au NPs into the hole transport layer(HTL)or electron transport layer(ETL)have been proposed previously.However,the Au NPs@SiO2 is difficult to obtain and affects the charge transport.When the Au NPs is blended in poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate)(PEDOT:PSS),the density of Au NPs is not easily controlled and the PEDOT:PSS is not an ideal HTL for PeLED.Therefore,the electrostatic adsorption is used in this work to uniformly disperse the~20 nmsize Au NPs on the top of the ITO anode,and the Poly(9-vinylcarbazole)(PVK)is spin-coated as the HTL to achieve the high performance red PeLED based on the(NMA)_(2) Cs_(n–1)Pb_(n)I_(3n+1).After the Au NPs modification,the maximum luminous brightness rises from~5.2 to~83.2 cd/m^(2).Meanwhile,the maximum external quantum efficiency rises from~0.255%to~6.98%.Mechanism studies show that microcavity can be formed between the Au NPs-modified ITO anode and the Al cathode,and the transmitted light and the reflected light interfere with each other to improve the output couple efficiency of the PeLED.The photoluminescence(PL)spectrum and angle dependent PL intensity of the Au NPs-modified PeLED prove that the fluorescence enhancement of the(NMA)_(2) Cs_(n–1)Pb_(n)I3_(n+1) perovskite is attributed mainly to the microcavity effect.Furthermore,the effects of Au NPs density on the performance of the PeLED are investigated,which reveals that the device with~15 min adsorption is optimal.Finally,we rule out the contributions of Au NPs to the morphology,crystallization,electrical properties and localized surface plasmon resonance(LSPR)effects of(NMA)_(2)Cs_(n–1)Pb_(n)I_(3n+1) perovskite films.In this work,the Au NPs are successfully applied to red PeLED for the first time,providing a feasible way of developing the l

关 键 词：金纳米颗粒 静电吸附 微腔效应 钙钛矿发光二极管 

分 类 号：TN312.8[电子电信—物理电子学] TB383.1[一般工业技术—材料科学与工程]