Doping-free tandem white organic light-emitting diodes

查看全文 作　　者：Baiquan [1]Liu;Lei [1]Wang;Hong [1]Tao;Miao [1]Xu;Jianhua [1]Zou;Honglong [1]Ning;Junbiao [1]Peng;Yong [1]Cao

机构地区：[1]Institute of Polymer Optoelectronic Materials and Devices,State Key Laboratory of Luminescent Materials and Devices,South China University of Technology,Cuangzhou 510640,China

出　　处：《Science Bulletin》索引2017年第62卷第17期,共8页

基　　金：supported by the National Basic Research Program of China(2015CB655004);the National Natural Science Foundation of China(61401156,U1601651,and U1301243);Pearl Rive S&T Nova Program of Guangzhou(201710010066,201610010052);the Fundamental Research Funds for the Central Universities(2017MS008);China Postdoctoral Science Foundation(2017T100627);Tiptop Scientific and Technical Innovative Youth Talents of Guangdong Special Support Program(2015TQ01C777,2016TQ03C331) 摘　　要：Tandem white organic light-emitting diodes(WOLEDs) are of great research interest since they can greatly boost the performance compared with the single-unit counterparts. However, their structures are more complicated than those of single-unit OLEDs. Besides, to achieve high performance, the doping technology is required to tandem OLEDs, particularly for tandem WOLEDs, further complicating the structures. Herein, doping-free tandem WOLEDs, for the first time, have been demonstrated. By managing an effective doping-free charge generation layer to interconnect doping-free emitting layers/charge transport layers, high-performance doping-free tandem WOLEDs have been developed. The blueyellow device accomplishes the simplified structure/short fabrication time/reduced cost/high efficiency/low efficiency roll-off/low voltage/high luminance trade-off, which cannot be achieved by previous tandem WOLEDs. Remarkably, the efficiency(81.2 cd A^(-1)) is ~2-fold higher than the highest efficiency of previous doping-free WOLEDs and even higher than those of some best doping tandem WOLEDs. The maximum luminance is 44,886 cd m^(-2), which is the highest for doping-free WOLEDs.Besides, the blue-red device can exhibit a color rendering index(CRI) of 67, which is even higher than that of some representative three-color tandem WOLEDs. Such findings may not only represent a significant step for doping-free WOLEDs, but unlock a novel avenue that doping-free tandem WOLEDs are promising to achieve the simplicity and high performance trade-off. 关键词：有机发光二极管掺杂技术串联白光自由 WOLED 结构比加工时间

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Doping-free tandem white organic light-emitting diodes

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