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Patterning Scheme Based on Photoacid Induced Spectral Changes for Single Layer, Patterned Full Color Light Emitting Diodes

Published online by Cambridge University Press:  26 February 2011

Maria Vasilopoulou ,
Giorgos Pistolis ,
Athanasios Botsialas ,
Nikos Stathopoulos ,
Maria Rangoussi  and
Panagiotis Argitis
Maria Vasilopoulou
Affiliation:
mariva@imel.demokritos.gr, National Center for Scientific Research "DEMOKRITOS", Institute of Microelectronis, Aghia Paraskevi, Athens 15310, Greece
Giorgos Pistolis
Affiliation:
pistolis@chem.demokritos.gr, National Center for Scientific Research "DEMOKRITOS", Institute of Physical Chemistry, Aghia Paraskevi, Athens, 15310, Greece
Athanasios Botsialas
Affiliation:
nasosbot@hotmail.com, Technological Education Institute of Piraeus, Dep. of Electronics, 250, Thivon str.,, Athens, 12244, Greece
Nikos Stathopoulos
Affiliation:
nstath@teipir.gr, Technological Education Institute of Piraeus, Dep. of Electronics, 250, Thivon str.,, Athens, 12244, Greece
Maria Rangoussi
Affiliation:
mariar@teipir.gr, Technological Education Institute of Piraeus, Dep. of Electronics, 250, Thivon str.,, Athens, 12244, Greece
Panagiotis Argitis
Affiliation:
argitis@imel.demokritos.gr, National Center for Scientific Research "DEMOKRITOS", Institute of Microelectronis, Aghia Paraskevi, Athens, 15310, Greece
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Abstract

Photochemically induced emission tuning (PIET) for the definition of different color emitting areas in a single conducting polymeric layer is demonstrated. The commercially available poly(9-vinylcarbazole) (PVK), well known as a hole transporting layer in OLEDs technology, was used. The three primary colors emitting areas in a single layer of PVK film were defined using a suitable green emitter 1-[4-(dimethylamino)phenyl]-6-phenylhexa-1,3,5,-triene (DMA-DPH) along with the red emitter (4-dimethylamino-4'-nitrostilbene) (DANS). The selected emitters were dispersed in the PVK films in the presence of a photoacid generator (PAG). Various onium salts were tested as photoacid generators in order to select those, which could cause effectivily the photoinduced protonation and emission tuning of the probes molecules. Through proton induced bleaching of the red emitter and proton induced spectral shift of the green one, the definition of all three primary color emitting areas was possible. In this way the unexposed areas of the film remain red, the areas exposed with the intermediate dose become green and the fully exposed areas emit blue color. Intermediate colors and white light can also be obtained.

Keywords

luminescenceoptoelectronicphotochemical
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 965: Symposium S – Organic Electronics – Materials, Devices and Applications , 2006 , 0965-S03-24
Copyright
Copyright © Materials Research Society 2007

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References

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