Experimental proof of Joule heating-induced switched-back regions in OLEDs
作者机构：Dresden Integrated Center for Applied Physics and Photonic Materials(IAPP)and Institute of Applied PhysicsTechnische Universitat DresdenNothnitzer StraBe 6101187 DresdenGermany Weierstrass Institute BerlinMohrenstraBe 3910117 BerlinGermany
出 版 物：《Light(Science & Applications)》 (光（科学与应用)（英文版）)
年 卷 期：2020年第9卷第1期
页 面：1951-1960页
核心收录：
基 金：supported in part by the German Research Foundation(DFG)within the Cluster of Excellence Center for Advancing Electronics Dresden(cfaed)and the DFG project EFOD(Grant No.RE3198/6-1) supported by the DFG under Germany's Excellence Strategy-MATH+:The Berlin Mathematics Research Center(EXC-2046/1-project ID:390685689)via projects AA2-1 and AA2-6 Open Access Funding by the Publication Fund of the TU Dresden funding from the Cusanuswerk Foundation
摘 要：Organic light-emitting diodes(OLEDs)have become a major pixel technology in the display sector,with products spanning the entire range of current panel *** ability to freely scale the active area to large and random surfaces paired with flexible substrates provides additional application scenarios for OLEDs in the general lighting,automotive,and signage *** applications require higher brightness and,thus,current density operation compared to the specifications needed for general *** extended transparent electrodes pose a significant ohmic resistance,OLEDs suffering from Joule self-heating exhibit spatial inhomogeneities in electrical potential,current density,and hence *** this article,we provide experimental proof of the theoretical prediction that OLEDs will display regions of decreasing luminance with increasing driving *** a two-dimensional OLED model,we can conclude that these regions are switched back locally in voltage as well as current due to insufficient lateral thermal ***,we demonstrate this effect in lab-scale devices and derive that it becomes more severe with increasing pixel size,which implies its significance for large-area,high-brightness use cases of ***,these non-linear switching effects cannot be ignored with respect to the long-term operation and stability of OLEDs;in particular,they might be important for the understanding of sudden-death scenarios.
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