Abstract

ABSTRACT A top-emitting organic light-emitting device (TOLED) with an architecture of Ag/Wo 3 /4,4 -bis[N -(1-naphthyl-1)-N-phenyl-amino]-bipheny l/tris-(8-hydroxyquinoline)aluminium(Alq 3 )/LiF/Al/semitransparent Ag/Capping layer 20~40nm WO 3 as capping layer has been investigated and WO 3 was demonstrated to be an effective capping layer and improve the luminance by a factor of 1.7 between the maximum and minimum transmittance of top contact. In this paper, the thicknesses of organic layers are calculated based on Fabry-Perot cavity theory. And with optimized, the top –emitting organic devices with single-mode resonance have a good ability such as a brightness of 40920cd/m 2 at the current density of 600ma/cm and a maximum luminous efficiency of 7.32cd/A at 9145cd/m 2 . Keywords: top-emitting organic light-emitting devices, microcavity, capping layer. 1. INTRODUCTION Organic light emitting diodes (OLEDs) have attracted a great deal of attention for potential use in next generation full-color flat panel displays. Compared with bottom-emi tting OLEDs(BOLEDs), the TEOLED have advantage of large aperture ratio and ease of fabrication on active-matrix backplanes with complicated pixel circuits, and have been intensively investigated recently[1-5]. Microcavities for TOLEDs with a metal mirror on one side and a distributed Bragg reflector on the other side have been studied in th e literature [2,6]. And all-metal-cavity TOLED with low-order resonant modes is more practical for display applications since it is more efficient and easy to be fabricated. In addition, larger optical length or thicker organic layers will result in high driving voltage [7]. It is well known that semitransparent cathodes [1-5, 10, 11-16] play a crucial role in TOLEDs. Cermets (e. g. Al-doped SiO)[8, 9] and multimetals (e. g. Al/Ag) [1-4] are widely used as semitran sparent cathodes due to their good conductivity: to enhance light outcoupling we deposited a capping layer of WO

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