Fuzzy-junction organic light-emitting devices
Journal
Applied Physics Letters
Journal Volume
81
Journal Issue
9
Pages
1570-1572
Date Issued
2002
Author(s)
Abstract
A "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.
Other Subjects
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 transition
Type
journal article