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Top emitting white OLEDs

Journal Article:

Abstract

Top emitting organic light emitting diodes (TOLEDs) provide a number of interesting opportunities for new applications, such as the opportunity to fabricate ITO-free devices by using opaque substrates. This makes it possible to manufacture low cost OLEDs for signage and lighting applications. A general top emitting device consists of highly reflecting metal contacts as anode and semitransparent cathode, the latter one for better outcouling reasons. In between several organic materials are deposited as charge transporting, blocking, and emission layers. Here, we show a top emitting white organic light emitting diode with silver electrodes arranged in a p-i-n structure with p- and n-doped charge transport layers. The centrical emission layer consists of two phosphorescent (red and green) and one fluorescent (blue) emitter systems separated by an ambipolar interlayer to avoid mutual exciton quenching. By adding an additional dielectric capping layer on top of the device stack, we achieve a reduction of the strong microcavity effects which appear due to the high reflection of both metal electrodes. Therefore, the outcoupled light shows broad and nearly angle-independent emission spectra, which is essential for white light emitting diodes.
Authors:
Freitag, Patricia; Luessem, Bjoern; Leo, Karl [1] 
  1. Technische Universitaet Dresden, Institut fuer Angewandte Photophysik, George-Baehr-Strasse 1, 01069 Dresden (Germany)
Publication Date:
Jul 01, 2009
Product Type:
Journal Article
Resource Relation:
Journal Name: Verhandlungen der Deutschen Physikalischen Gesellschaft; Journal Issue: Dresden 2009 issue; Conference: DPG Spring meeting 2009 of the condensed matter section with the divisions biological physics, chemical and polymer physics, dielectric solids, dynamics and statistical physics, low temperature physics, magnetism, metal and material physics, semiconductor physics, surface science, thin films, vacuum science and technology as well as the working groups industry and business, physics of socio-economic systems, Dresden (Germany), 22-27 Mar 2009; Other Information: Session: DS 16.11 Di 09:30; No further information available; Also available as printed version: Verhandlungen der Deutschen Physikalischen Gesellschaft v. 44(5)
Subject:
36 MATERIALS SCIENCE; DOPED MATERIALS; ELECTRIC CONTACTS; ELECTRODES; EMISSION SPECTRA; EXCITONS; FLUORESCENCE; LIGHT EMITTING DIODES; N-TYPE CONDUCTORS; OPACITY; ORGANIC SEMICONDUCTORS; P-TYPE CONDUCTORS; PHOSPHORESCENCE; SILVER; SUBSTRATES
OSTI ID:
21284220
Country of Origin:
Germany
Language:
English
Other Identifying Numbers:
Journal ID: ISSN 0420-0195; VDPEAZ; TRN: DE10G3781
Availability:
http://www.dpg-verhandlungen.de
Submitting Site:
DE
Size:
1 pages
Announcement Date:
Apr 09, 2010

Journal Article:

Citation Formats

Freitag, Patricia, Luessem, Bjoern, and Leo, Karl. Top emitting white OLEDs. Germany: N. p., 2009. Web.
Freitag, Patricia, Luessem, Bjoern, & Leo, Karl. Top emitting white OLEDs. Germany.
Freitag, Patricia, Luessem, Bjoern, and Leo, Karl. 2009. "Top emitting white OLEDs." Germany.
@misc{etde_21284220,
title = {Top emitting white OLEDs}
author = {Freitag, Patricia, Luessem, Bjoern, and Leo, Karl}
abstractNote = {Top emitting organic light emitting diodes (TOLEDs) provide a number of interesting opportunities for new applications, such as the opportunity to fabricate ITO-free devices by using opaque substrates. This makes it possible to manufacture low cost OLEDs for signage and lighting applications. A general top emitting device consists of highly reflecting metal contacts as anode and semitransparent cathode, the latter one for better outcouling reasons. In between several organic materials are deposited as charge transporting, blocking, and emission layers. Here, we show a top emitting white organic light emitting diode with silver electrodes arranged in a p-i-n structure with p- and n-doped charge transport layers. The centrical emission layer consists of two phosphorescent (red and green) and one fluorescent (blue) emitter systems separated by an ambipolar interlayer to avoid mutual exciton quenching. By adding an additional dielectric capping layer on top of the device stack, we achieve a reduction of the strong microcavity effects which appear due to the high reflection of both metal electrodes. Therefore, the outcoupled light shows broad and nearly angle-independent emission spectra, which is essential for white light emitting diodes.}
journal = {Verhandlungen der Deutschen Physikalischen Gesellschaft}
issue = {Dresden 2009 issue}
place = {Germany}
year = {2009}
month = {Jul}
}