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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

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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 )