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Title: Tunable color parallel tandem organic light emitting devices with carbon nanotube and metallic sheet interlayers

Parallel tandem organic light emitting devices (OLEDs) were fabricated with transparent multiwall carbon nanotube sheets (MWCNT) and thin metal films (Al, Ag) as interlayers. In parallel monolithic tandem architecture, the MWCNT (or metallic films) interlayers are an active electrode which injects similar charges into subunits. In the case of parallel tandems with common anode (C.A.) of this study, holes are injected into top and bottom subunits from the common interlayer electrode; whereas in the configuration of common cathode (C.C.), electrons are injected into the top and bottom subunits. Both subunits of the tandem can thus be monolithically connected functionally in an active structure in which each subunit can be electrically addressed separately. Our tandem OLEDs have a polymer as emitter in the bottom subunit and a small molecule emitter in the top subunit. We also compared the performance of the parallel tandem with that of in series and the additional advantages of the parallel architecture over the in-series were: tunable chromaticity, lower voltage operation, and higher brightness. Finally, we demonstrate that processing of the MWCNT sheets as a common anode in parallel tandems is an easy and low cost process, since their integration as electrodes in OLEDs is achieved bymore » simple dry lamination process.« less
Authors:
; ;  [1] ;  [2] ;  [3] ;  [2] ;  [3] ;  [4]
  1. Centro de Investigaciones en Optica, A.P. 1-948, León, Guanajuato 37160 (Mexico)
  2. Solarno Inc., Coppell, Texas 75019 (United States)
  3. (United States)
  4. (Russian Federation)
Publication Date:
OSTI Identifier:
22492945
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 118; Journal Issue: 19; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANODES; BRIGHTNESS; CARBON NANOTUBES; CATHODES; COLOR; ELECTRIC POTENTIAL; FILMS; HOLES; LIGHT EMITTING DIODES; METALS; MOLECULES; PERFORMANCE; POLYMERS; SHEETS