基于ZnS增透膜的顶发射白光有机发光二极管  

Top-emitting white organic light-emitting diodes based on a ZnS light outcoupling layer

作　　者：陈淑芬[1] 邵茗[1] 郭旭[1] 钱妍[1] 石乃恩[1] 解令海[1] 杨洋[1] 黄维[1] 

机构地区：[1]南京邮电大学信息材料与纳米技术研究院,江苏省有机电子与信息显示重点实验室,南京210046

出　　处：《物理学报》2012年第8期432-439,共8页Acta Physica Sinica

基　　金：国家重点基础研究发展计划(批准号:2009CB930600);国家自然科学基金(批准号:60907047,60977024,21101095,20974046,21003076,51173081,61136003);高等学校博士学科点专项科研基金(批准号:20093223120003);江苏省自然科学基金(批准号:BK2009423);江苏省高等学校自然科学基金(批准号:SJ209003,09KJB150009,10KJB510013,TJ209035);江苏省“青蓝”工程和南京邮电大学攀登计划(批准号:NY210015)资助的课题;Project supported by the State Key Development Program for Basic Research of China(Grant No.2009CB930600);the National Natural Science Foundation of China(Grant Nos.60907047,60977024,21101095,20974046,21003076,51173081,61136003);the Specialized Research Foundation for the Doctoral Program of Higher Education of China(Grant No.20093223120003);the Natural Science Foundation of Jiangsu Province,China(Grant No.BK2009423);the Natural Science Foundation of Institution of Higher Education of Jiangsu Province,China(GrantNos.SJ209003,09KJB150009,10KJB510013,TJ209035);the "Qing Lan" Program of Jiangsu Province,China,and the Climbing Program of Nanjing University of Posts and Telecommunications,China(Grant No.NY210015)

摘　　要：顶发射白光有机发光二极管(TEWOLED)在白光照明和全彩显示中有着良好的应用前景,克服顶发射器件中的微腔效应是制备光电性能良好的TEWOLED的前提.使用具有高折射率的ZnS作为增透膜改善金属阴极在蓝光波段的透射率,降低其反射性,从而有效抑制了微腔的影响.同时利用转移矩阵理论和宽角干涉方法分别对阴极结构和蓝光发光层位置进行了优化,最终获得了高效、色纯度良好、色度随视角变化小的TEWOLED.最高亮度和效率分别达到9213 cd/m^2和3 cd/A,色坐标位于白光区且接近白光等能点,同时具有良好的视角稳定性,在0°-60°范围内色坐标仅变化(0.02,0).Top-emitting white organic light-emitting diode （TEWOLED） has potential applications in lighting and full color displays. Microcavity effect in TEWOLED restrains the realization of the white emission with excellent optical and electric performances. In this paper, a ZnS film with a high refractive index used as a light outcoupling layer is introduced into the metal cathode to enhance its transmittivity to a maximal value in the blue light wavelength region. In addition, transfer matrix theory is utilized to optimize the thicknesses of the cathode and the ZnS outcoupling layer and the wide-angle interference is used to design the position of the blue emission layer inside the organic light-emitting diode. Based on the above work, the white light with relatively high luminous efficiency, good color purity, and small CIE coordinate change is acquired. The corresponding luminance and current efficicency are 9213 cd/m2 and 3 cd/A, respectively. The CIE coordinates belong to the white emission and are near the white light equal-energy point. The white emission also shows stable spectra with respect to the observation angle, with a limited CIE coordinate change of （0.02, 0） for a large observation angle change from 0° to 60°.

关 键 词：白光有机发光二极管 顶发射 增透膜 转移矩阵理论 

分 类 号：TN312.8[电子电信—物理电子学]