Influence of charge carrier injection on the device performance of blue organic light-emitting diodes

Heike Riel; Horst Vestweber; Walter Riess

doi:10.1117/12.305427

17 April 1998 Influence of charge carrier injection on the device performance of blue organic light-emitting diodes

Heike Riel, Horst Vestweber, Walter Riess

Proceedings Volume 3281, Polymer Photonic Devices; (1998) https://doi.org/10.1117/12.305427
Event: Optoelectronics and High-Power Lasers and Applications, 1998, San Jose, CA, United States

Abstract

Multilayer organic light-emitting diodes with a well-defined emission region are ideal systems to investigate the underlying mechanisms of device operation. In this paper we give a brief overview of our studies on the injection and recombination processes in blue organic light-emitting diodes. Our diodes consist of copper phthalocyanine as the hole- injection/buffer layer, the aromatic diamine N,N'- di(naphthalene-1-yl)-N,N'-diphenyl-benzidine as the hole- transport layer, a distyrylarylene derivative as the emitting layer, tris(8-hydroxy-quinoline)aluminum as the electron- injection/transport layer sandwiched between indium tin oxide (ITO) as the transparent hole injector, and low work-function metals as the electron-injecting electrode. To reveal the limiting mechanisms in device operation we investigated the influence of different anode (ITO, optimized ITO) and cathode materials (Mg:Ag, Ca, LiF/Mg:Ag) as well as different layer thicknesses on the device characteristics. These investigations revealed that the device characteristics in the low and medium voltage range are determined by the injection properties of the electrodes, whereas at higher voltages (i.e. at higher current densities) a transition from an electrode- limited injection to a bulk-limited conduction process is detectable.

Citation Download Citation

Heike Riel, Horst Vestweber, and Walter Riess "Influence of charge carrier injection on the device performance of blue organic light-emitting diodes", Proc. SPIE 3281, Polymer Photonic Devices, (17 April 1998); https://doi.org/10.1117/12.305427

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available