By Topic

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

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

The purchase and pricing options are temporarily unavailable. Please try again later.
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: 

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 )