Chen, C.-W.C.-W.ChenCho, T.-Y.T.-Y.ChoCHUNG-CHIH WUYu, H.-L.H.-L.YuTIEN-YAU LUH2018-09-102018-09-10200200036951http://www.scopus.com/inward/record.url?eid=2-s2.0-79955998297&partnerID=MN8TOARShttp://scholars.lib.ntu.edu.tw/handle/123456789/297010https://www.scopus.com/inward/record.uri?eid=2-s2.0-79955998297&doi=10.1063%2f1.1502912&partnerID=40&md5=5925717d0bddc853b7a830d602be864dA "fuzzy-junction" organic light-emitting device (OLED) containing a graded organic-organic interface is reported. Such graded junction is effectively produced utilizing interdiffusion through an ultrathin interfacial fusing layer sandwiched between two functional layers. With a glass transition temperature (Tg) lower than remaining layers, this fusing layer permits smooth interdiffusion and mixing of neighboring layers by annealing above its Tg. With appropriate material combinations, fuzzy-junction OLEDs thus prepared exhibit both reduced voltage and enhanced emission efficiency in comparison with conventional abrupt-junction devices. As an instance, a green fluorescent OLED with such fuzzy junction shows a high peak power efficiency of ∼20 lm/W, substantially higher than ∼14 lm/W of a corresponding abrupt-junction device. © 2002 American Institute of Physics.Appropriate materials; Enhanced Emission; Functional layer; Graded junction; High peak power; Organic light-emitting devices; Organic-organic interface; Remaining layers; Ultra-thin; Current density; Light emission; Glass transitionjournal article10.1063/1.15029122-s2.0-79955998297WOS:000177549200010