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Quantum efficiency improvement in anthracene-based organic light-emitting diodes codoped with a hole-trapping material

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1 Author(s)
Jarikov, Viktor V. ; Research Laboratories, Eastman Kodak Company, 1999 Lake Ave., Rochester, New York 14650, USA

Your organization might have access to this article on the publisher's site. To check, click on this link:http://dx.doi.org/+10.1063/1.2939099 

We focus on organic light-emitting diodes having an N,N-di(1-naphthyl)-N,N-diphenylbenzidine (NPB) hole-transport layer, a doped light-emitting layer (LEL) based on a 9,10-diarylanthracene (DAA), and a tris(8-quinolinolato)aluminum (Alq) electron-transport layer. The addition of a hole-trapping codopant, e.g., NPB, to the LEL can triple the external quantum efficiency (EQE), which can reach 3%–6%. We discuss (a) the magnitude of the effect and the causes, (b) the effect on the drive voltage, emission spectrum, and operating lifetime, and (c) the approaches to higher EQEs of 5%–10%. We compare (a) various blue and green LEL dopants, (b) NPB codopant with aminated polycyclic aromatic hydrocarbons, which reduce the EQE, and (c) the DAA-based cells with their Alq-based counterparts.

Published in:

Applied Physics Letters  (Volume:92 ,  Issue: 24 )

Date of Publication:

Jun 2008

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