Fe(NH_(2)trz)_(3)·(BF_(4))_(2)掺杂聚芴的有机电致发光器件  

Research on Fe(NH_(2)trz)_(3)·(BF_(4))_(2)doped polyfluorene organic light-emitting devices

作　　者：徐冲 牛连斌[1] 钱雅翠 文林[1] 熊元强 彭浩南 关云霞[1] Xu Chong;Niu Lian-Bin;Qian Ya-Cui;Wen Lin;Xiong Yuan-Qiang;Peng Hao-Nan;Guan Yun-Xia(College of Physics and Electronic Engineering,Chongqing Normal University,Chongqing 401331,China;School of Chemistry and Chemical Engineering,Shaanxi Normal University,Xi’an 710119,China)

机构地区：[1]重庆师范大学物理与电子工程学院,重庆401331 [2]陕西师范大学化学化工学院,西安710119

出　　处：《物理学报》2021年第7期300-308,共9页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:61874016,11875010);重庆市自然科学基金(批准号:CSTC 2020jcyj-msxmX0282,CSTC 2019jcyjmsxmX0148);重庆市特殊人才支持计划(批准号:CSTC 2018kjcxljrc0050)资助的课题.

摘　　要：对于RGB有机电致发光器件(OLEDs),蓝光非常重要.在现有各种蓝光材料中,聚芴(PFO)非常稳定且荧光量子效率可达80%,但它有一个非常大的缺点:电致发光会产生异常绿光带.这严重影响了PFO相关器件的饱和色纯度.本文使用分子基磁性材料Fe(NH_(2)trz)_(3)·(BF_(4))_(2)掺杂PFO方法,解决了这一难题.以ITO为衬底,制作了结构为ITO/PEDOT:PSS/PFO:Fe(NH_(2)trz)_(3)·(BF_(4))_(2)/CsCl/Al的器件.报道了利用Fe(NH_(2)trz)_(3)·(BF_(4))_(2)特殊的电子自旋态调制PFO的光电特性,实现了PFO的强烈纯正蓝光发射.详细研究了Fe(NH_(2)trz)_(3)·(BF_(4))_(2)对PFO光电特性的影响.在4 V至9 V电压的偏置下,没有Fe(NH_(2)trz)_(3)·(BF_(4))_(2)的器件,发出特别异常的绿光.然而,与此形成明显对照的是:Fe(NH_(2)trz)_(3)·(BF_(4))_(2)掺杂的器件发出强烈的本征蓝光;PFO绿色发光带被成功压制;随着电压的变化,器件光谱的蓝光部分在整个EL谱所占比例没有改变.运用光电磁一体化测量技术,进一步研究了PFO掺杂Fe(NH_(2)trz)_(3)·(BF_(4))_(2)器件的磁发光(MEL)和磁电导(MC)效应.发现PFO:Fe(NH_(2)trz)_(3)·(BF_(4))_(2)和纯PFO薄膜内都没有激基缔合物产生.运用发光动力学理论,分析了Fe(NH_(2)trz)_(3)·(BF_(4))_(2)阻断PFO异常绿光发射的机理.Since the breakthrough by Tang et al.in 1987,organic light-emitting devices(OLEDs)have attracted extensive attention in the industries and academic research communities.OLEDs have many promising characteristics,such as self-illumination,lower power consumption,easy fabrication and so on.It has a broad development prospect in high resolution display and other fields.For RGB color OLED display technology,blue light organic material is very important.Polyfluorene(PFO)is a kind of rigid planar biphenyl structure compound in all kinds of OLEDs blue light materials.However,PFO has a very big disadvantage:the long wave shift of the light-emitting peak of the electroluminescent device will produce the green light-emitting band that should not have appeared.This seriously affects the saturation color purity of PFO devices,and also seriously restricts the industrialization process.In this paper,the molecular magnetic material[Fe(NH_(2)trz)_(3)·(BF_(4))_(2)]is used to solve this problem.ITO/PEDOT:PSS(30 nm)/PFO:Fe(NH_(2)trz)_(3)·(BF_(4))_(2)(65 nm)/CsCl(0.6 nm)/Al(120 nm)devices were fabricated on ITO glass substrate.It is the first time to report the strong pure blue emission of PFO by using the special electronic spin state modulation of Fe(NH_(2)trz)_(3)·(BF_(4))_(2).The influence of Fe(NH_(2)trz)_(3)·(BF_(4))_(2)on the photoelectric properties of PFO was studied in detail by analyzing the PL and EL characteristics of PFO and PFO:Fe(NH_(2)trz)_(3)·(BF_(4))_(2).Under the bias voltage of 4 V to 9 V,the device without doping Fe(NH_(2)trz)_(3)·(BF_(4))_(2)emits very strong green light.The central peak wavelength is 553 nm,and the color coordinates are(0.33,0.45).Moreover,with the constant change of voltage,the green lightemitting band is always much larger than the blue light-emitting band.However,the obvious difference is that Fe(NH_(2)trz)_(3)·(BF_(4))_(2)doped device emits strong blue light,the peak wavelength is 438 nm,and the color coordinates(0.23,0.22),which is completely consistent with the peak wavelength of

关 键 词：有机电致发光器件 聚芴 分子基磁性材料 磁发光和磁电导 

分 类 号：TB34[一般工业技术—材料科学与工程] TN383.1[电子电信—物理电子学]