基于空穴传输层与发光层成膜调控的钙钛矿发光二极管在空气中的制备及其性能研究  

Study on preparation and properties of perovskite light emitting diodes in air based on modulation of hole transport layer and light emitting layer film formation

作　　者：刘国栋 高修安 王银凤 张方辉[3] LIU Guo-dong;GAO Xiu-an;WANG Yin-feng;ZHANG Fang-hui(College of Bioresources Chemical and Materials Engineering,National Demonstration Center for Experimental Light Chemistry Engineering Education,Shaanxi Province Key laboratory of Papermaking Technology and Specialty Paper,Key laboratory of Functional Printing and Transport Packaging of China National Light Industry,Key laboratory of Paper based Functional Materials of China National Light Industry,Shaanxi University of Science&Technology,Xi′an 710021,China;Shanghai Publishing and Printing College,Shanghai 200093,China;School of Electronic Information and Artificial Intelligence,Shaanxi University of Science&Technology,Xi′an 710021,China)

机构地区：[1]陕西科技大学轻工科学与工程学院轻化工程国家级实验教学示范中心陕西省造纸技术及特种纸品开发重点实验室中国轻工业功能印刷与运输包装重点实验室中国轻工业纸基功能材料重点实验室,陕西西安710021 [2]上海出版印刷高等专科学校,上海200093 [3]陕西科技大学电子信息与人工智能学院,陕西西安710021

出　　处：《陕西科技大学学报》2022年第6期18-27,共10页Journal of Shaanxi University of Science & Technology

基　　金：国家自然科学基金项目(22078186);陕西省科技厅重点研发计划项目(2020GY-320);国家新闻出版署智能与绿色柔版印刷重点实验室项目(ZBKT202106)。

摘　　要：有机-无机杂化金属卤化物钙钛矿具备色纯度高、可溶液加工、带隙可调节等诸多优点,在光电领域得到了广泛的关注.钙钛矿作为发光器件的发光功能层材料,对空气中的水氧较为敏感,同时钙钛矿晶体之间的孔洞,也会对发光器件的性能造成影响.通过异丙醇(IPA)对空穴传输功能层(聚(3,4-乙烯二氧噻吩)-聚苯乙烯磺酸(PEDOT∶PSS))进行调控成膜效果,同时通过聚氧化乙烯(PEO)对甲基胺溴化铅(CH_(3)NH_(3)PbBr_(3))的前驱体溶液进行掺杂,共同提高钙钛矿发光功能层的均匀度及覆盖率,通过全溶液法在空气中制备了低启亮电压的钙钛矿发光二极管并对PEO修饰的钙钛矿发光功能层均匀成膜的内在原因进行了分析.研究表明,IPA的掺杂改善了空穴传输层的均匀度,为发光层的成膜提供了良好的基础,同时减小了PEDOT∶PSS与CH_(3)NH_(3)PbBr_(3)的能级差,降低了器件的启亮电压;PEO的使用提高了钙钛矿发光层对空气中水氧的抵抗能力,并限制了钙钛矿晶体的尺寸,提高了钙钛矿薄膜的覆盖率.制备的器件在空气中测试启亮电压为2.4 V,最高亮度为3126 cd m^(-2),最大电流效率为0.65 cd A^(-1).Organic-inorganic hybrid metal halide perovskite have many advantages such as high color purity,a tenability of the band gap,and easy solution processing,which have gained wide attention in the field of optoelectronics.Perovskite,as the light-emitting functional layer material of light-emitting devices,is sensitive to water and oxygen in the air,while the holes between the calcium titanite crystals,but also on the performance of light-emitting devices.In this paper,the doping of the hole transport layer(poly(3,4-ethylenedioxythiophene)-polystyrene sulfonic acid(PEDOT∶PSS))by isopropyl alcohol(IPA)to regulate its film formation effect,and the doping of the precursor solution of methylammonium lead bromide(CH_(3)NH_(3)PbBr_(3))by polyethylene oxide(PEO)to jointly improve the uniformity and coverage of the perovskite luminescent functional layer.Perovskite light-emitting diodes with low start-up voltage were prepared in air by the total solution method,and the intrinsic reasons for the uniform film formation of PEO-modified chalcogenide functional layers were analyzed.It is shown that the doping of IPA improves the uniformity of the hole transport layer and provides a good basis for the film formation of the luminescent layer,and also reduces the energy level difference between PEDOT∶PSS and CH_(3)NH_(3)PbBr_(3),which reduces the turn-on voltage of the device;the use of PEO improves the resistance of the perovskite luminescent layer to water and oxygen in air and limits the size of the perovskite crystal,which improves the coverage of perovskite films.The prepared devices were tested in air with a turn-on voltage of 2.4 V,a maximum brightness of 3126 cd m^(-2),and a maximum current efficiency of 0.65 cd A^(-1).

关 键 词：钙钛矿 发光二极管 复合薄膜 成膜 

分 类 号：TN312.8[电子电信—物理电子学]