Tailoring spin mixtures by ion-enhanced Maxwell magnetic coupling in colortunable organic electroluminescent devices

作     者：Junwei Xu Yue Cui Gregory M.Smith Peiyun Li Chaochao Dun Linqi Shao Yang Guo Hongzhi Wang Yonghua Chen David L.Carroll 

作者机构：Center for Nanotechnology and Molecular MaterialsWake Forest UniversityWinston-SalemNC 27109USA Department of PhysicsWake Forest UniversityWinston-SalemNC 27106USA Key Laboratory of Luminescence and Optical Information(Ministry of Education)Institute of Optoelectronics TechnologyBeijing Jiaotong University100044 BeijingP.R.China Department of Electro-OpticsSchool of EngineeringUniversity of DaytonDaytonOH 45469USA Department of MathematicsWake Forest UniversityWinston-SalemNC 27106USA State Key Laboratory for Modification of Chemical Fibers and Polymer Materials201620 ShanghaiP.R.China College of Materials Science and EngineeringDonghua University201620 Shanghai P.R.China Institute of Advanced MaterialsNanjing Tech University211816 NanjingJiangsuP.R.China Department of Physics and AstronomyCollege of CharlestonCharlestonSC 29424USA 

出 版 物：《Light(Science & Applications)》 (光（科学与应用)（英文版）)

年 卷 期：2018年第7卷第1期

页      面：629-640页

核心收录：

学科分类：0808[工学-电气工程] 080901[工学-物理电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：the financial support and use of equipment from the Center for Nanotechnology and Molecular Materials at Wake Forest University provided through NSF grant ECCS-1610641 

主　　题：temperature. coupling Maxwell 

摘      要：In this work,we show that the spin dynamics of excitons can be dramatically altered by Maxwell magnetic field coupling,together with an ion-enhanced,low-internal-splitting-energy organic semiconducting *** employing a unique,alternating current(AC)-driven organic electroluminescent(OEL)device architecture that optimizes this magnetic field coupling,almost complete control over the singlet-to-triplet ratio(from fluorescent to phosphorescent emission in a single device)is *** attribute this spin population control to magnetically sensitive polaron–spin pair intersystem crossings(ISCs)that can be directly manipulated through external driving *** an illustration of the utility of this approach to spin-tailoring,we demonstrate a simple hybrid(double-layer)fluorescence–phosphorescence(F–P)device using a polyfluorene-based emitter with a strong external Zeeman effect and ion-induced long carrier *** control over de-excitation pathways is achieved by controlling the device-driving frequency,resulting in complete emission blue–red color *** photoluminescence(PL)spectroscopy directly confirms that this color control derives from the magnetic manipulation of the singlet-totriplet *** results may pave the way to far more exotic organic devices with magnetic-field-coupled organic systems that are poised to usher in an era of dynamic spintronics at room temperature.