WCl_(6)掺杂PEDOT∶PSS作为空穴注入层的高效率近紫外有机发光器件  

Highly Efficient Near Ultraviolet Organic Light-emitting Device Based on WCl_(6) Doped PEDOT∶PSS as Hole Injection Layer

作　　者：王家兴 姚登莉 蔡平[1] 薛小刚[1] 刘黎明[2] 王立惠 卢宗柳 张小文[1] WANG Jia-xing;YAO Deng-li;CAI Ping;XUE Xiao-gang;LIU Li-ming;WANG Li-hui;LU Zong-liu;ZHANG Xiao-wen(Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, China;Zhongshan Branch of State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan 528402, China;Guilin Key Laboratory of Microelectronic Electrode Materials and Biological Nanomaterials, Guangxi Key Laboratory of Superhard Materials, China Monferrous Metal(Guilin) Geology and Mining Co., Ltd., Guilin 541004, China)

机构地区：[1]桂林电子科技大学广西电子信息材料构效关系重点实验室,广西桂林541004 [2]电子科技大学中山学院电子薄膜与集成器件国家重点实验室中山分室,广东中山528402 [3]中国有色桂林矿产地质研究院有限公司广西超硬材料重点实验室,桂林市微电子元件电极材料与生物纳米材料重点实验室,广西桂林541004

出　　处：《发光学报》2021年第12期1906-1913,共8页Chinese Journal of Luminescence

基　　金：国家自然科学基金(62065004,52063010,51762011);广西自然科学基金(2018GXNSFDA294002);中山市科技项目(2019B2018);广西重点研发计划(桂科AB19110032);广西研究生教育创新计划(YCSW2020162)资助项目。

摘　　要：紫外有机发光器件(OLED)的宽带隙发光分子限制了空穴注入效率,从而导致载流子复合低效,器件发展受限。可溶液处理工艺兼顾了低成本、高可控性及规模生产的时代特色。本文报道了利用溶液法制备的WCl_(6)及其与聚(3,4-乙烯二氧噻吩)-聚苯乙烯磺酸掺杂复合物(PEDOT∶PSS+WCl_(6))调控近紫外OLED的空穴注入特性,实现了高效率近紫外有机发光。X射线光电子能谱、紫外-可见光吸收光谱等分析表明,WCl_(6)和PEDOT∶PSS+WCl_(6)薄膜具有优异的电子特性和光透过性。伏安特性和阻抗谱分析表明,空穴注入能力按WCl_(6)、PEDOT∶PSS和PEDOT∶PSS+WCl_(6)的顺序依次增强。以PEDOT∶PSS+WCl_(6)作空穴注入层、2-(4-联苯)-5-(4-叔丁基苯基)-1,3,4-恶二唑(PBD)作发光层,获得了最大外量子效率为2.6%、最大辐照度为8.05 mW/cm2、半峰宽为45 nm、电致发光峰为405 nm的高效率近紫外OLED。器件寿命测试对比结果表明,WCl_(6)掺杂PEDOT∶PSS后器件的稳定性得到了增强。该研究结果拓展了WCl_(6)的应用领域,对于推进高效稳定近紫外OLED的进一步发展具有一定的借鉴意义。Wide bandgap of emissive molecule in ultraviolet organic light-emitting device(UV-OLED)restricts hole injection,which results in inefficient carrier recombination and counteracts performance promotion.Solution-processed techniques with low cost,fine tunability and high throughout production meet the current requirement of manufacture.Herein,solution-processed WCl_(6) and its doping composite of poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate)(PEDOT∶PSS)+WCl_(6) are employed for tailoring hole injection of near UV-OLED,and thus achieving high efficiency.X-ray photoelectron spectroscopy and UV-visible absorption analysis show that WCl_(6) and PEDOT∶PSS+WCl_(6) films behave exceptional electronic properties and superior optical transmittance.Current-voltage characteristics and impedance spectroscopy analysis confirm that the hole injection ability is enhanced in the order of WCl_(6),PEDOT∶PSS and PEDOT∶PSS+WCl_(6).Using PEDOT∶PSS+WCl_(6) as hole injection tailoring and 2-(4-biphenyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole(PBD)as emissive layer,the near UV-OLED reaches maximum external quantum efficiency of 2.6%,radiance of 8.05 mW/cm2,full width at half maximum of 45 nm and electroluminescent peak of 405 nm.Device aging tests indicate that WCl_(6) doped PEDOT∶PSS considerably enhances the stability of near UV-OLED.Our results expand the application of WCl_(6) and efficient stable near UV-OLED.

关 键 词：紫外有机发光器件 WCl_(6) 可溶液加工 空穴注入 阻抗谱 

分 类 号：TN383.1[电子电信—物理电子学]