Polymer light-emitting diodes: from materials to devices

Arjan J. M. Berntsen; Yvo Croonen; Raymond Cuijpers; Boris Habets; Coen T. H. F. Liedenbaum; Herman F. M. Schoo; Robert Jan Visser; Jeroen J. M. Vleggaar; Peter van de Weijer

doi:10.1117/12.279343

1 December 1997 Polymer light-emitting diodes: from materials to devices

Arjan J. M. Berntsen, Yvo Croonen, Raymond Cuijpers, Boris Habets, Coen T. H. F. Liedenbaum, Herman F. M. Schoo, Robert Jan Visser, Jeroen J. M. Vleggaar, Peter van de Weijer

Author Affiliations +

Proceedings Volume 3148, Organic Light-Emitting Materials and Devices; (1997) https://doi.org/10.1117/12.279343
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

In this paper on polymer LEDs we discuss the formation of black spots, surface treatments of the anode, and photochemical degradation of the emissive polymer. We find that small pinholes in the cathode layer are the origin of the black spots. The black spots form when H₂O or O₂ diffuse through the pinholes and react with the cathode at the polymer-cathode interface.A model is presented that describes the growth of the spots. We find that for both indium-tin-oxide (ITO) and Au anodes, an UV/O₃ or an O₂ plasma cleaning treatment increases the work function by 0.8-0.9 eV. A higher work function may lead to a better hole injection and a reduction in the operating voltage. We present a method to measure the quantum yield for bleaching, (gamma) equals 1.6^$MN4 and (gamma) equals 1.7 10^-7 for bleaching of dialkoxy-PPV in air and vacuum, respectively, indicating that the polymer is 1000 times more stable in vacuum than in air.

Citation Download Citation

Arjan J. M. Berntsen, Yvo Croonen, Raymond Cuijpers, Boris Habets, Coen T. H. F. Liedenbaum, Herman F. M. Schoo, Robert Jan Visser, Jeroen J. M. Vleggaar, and Peter van de Weijer "Polymer light-emitting diodes: from materials to devices", Proc. SPIE 3148, Organic Light-Emitting Materials and Devices, (1 December 1997); https://doi.org/10.1117/12.279343

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