Colour selective organic photodetectors utilizing ketocyanine-cored dendrimers

Jansen-van Vuuren, Ross D., Pivrikas, Almantas, Pandey, Ajay K. and Burn, Paul L. (2013) Colour selective organic photodetectors utilizing ketocyanine-cored dendrimers. Journal of Materials Chemistry C, 1 22: 3532-3543. doi:10.1039/c3tc30472h


Author Jansen-van Vuuren, Ross D.
Pivrikas, Almantas
Pandey, Ajay K.
Burn, Paul L.
Title Colour selective organic photodetectors utilizing ketocyanine-cored dendrimers
Journal name Journal of Materials Chemistry C   Check publisher's open access policy
ISSN 2050-7526
2050-7534
Publication date 2013-06-14
Year available 2013
Sub-type Article (original research)
DOI 10.1039/c3tc30472h
Open Access Status Not Open Access
Volume 1
Issue 22
Start page 3532
End page 3543
Total pages 12
Place of publication Cambridge, United Kingdom
Publisher RSC Publications
Language eng
Subject 1600 Chemistry
2505 Materials Chemistry
Abstract Accurate colour reproduction by image sensors requires four narrow-band absorbing photodetectors (blue, green, yellow and red), and this is generally achieved by using a broadband photodetector and colour filters. We have developed an organic photodetector in which colour selection is achieved by the light-absorbing layer of the detector. The photoactive layer is comprised of a green absorbing ketocyanine dye-cored dendrimer with the dendrons providing solution processability and prevention of aggregation in the solid-state, which can otherwise lead to the broadening of the absorption spectrum. The properties of the photoactive dendrimer were found to be dependent on the attachment point and number of dendrons. The best photodetector contained a bulk heterojunction (BHJ) light-absorbing layer comprised of the dendrimer with two first generation biphenyl-based dendrons attached to the nitrogen atoms of the ketocyanine dye blended with [6,6]-phenyl-C-61-butryic acid methyl ester (PC60BM). The photodetector had a Full Width at Half Maximum (FWHM) of the response of 130 nm centred around 500 nm, an External Quantum Efficiency (EQE) of 8.2% at -1 V and the largest rectification ratio (2.7 x 10(4) at 0 V) so far reported for a green-absorbing organic photodetector. The performance of the photodetector was found to be approaching that required for current machine vision systems.
Formatted abstract
Accurate colour reproduction by image sensors requires four narrow-band absorbing photodetectors (blue, green, yellow and red), and this is generally achieved by using a broadband photodetector and colour filters. We have developed an organic photodetector in which colour selection is achieved by the light-absorbing layer of the detector. The photoactive layer is comprised of a green absorbing ketocyanine dye-cored dendrimer with the dendrons providing solution processability and prevention of aggregation in the solid-state, which can otherwise lead to the broadening of the absorption spectrum. The properties of the photoactive dendrimer were found to be dependent on the attachment point and number of dendrons. The best photodetector contained a bulk heterojunction (BHJ) light-absorbing layer comprised of the dendrimer with two first generation biphenyl-based dendrons attached to the nitrogen atoms of the ketocyanine dye blended with [6,6]-phenyl C61-butryic acid methyl ester (PC60BM). The photodetector had a Full Width at Half Maximum (FWHM) of the response of 130 nm centred around 500 nm, an External Quantum Efficiency (EQE) of 8.2% at −1 V and the largest rectification ratio (2.7 × 104 at 0 V) so far reported for a green-absorbing organic photodetector. The performance of the photodetector was found to be approaching that required for current machine vision systems.
Keyword Machine vision
Constancy
Dyes
Chromaticity
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID EP/E01075X/1
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Centre for Organic Photonics and Electronics
Official 2014 Collection
School of Chemistry and Molecular Biosciences
 
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Citation counts: TR Web of Science Citation Count  Cited 25 times in Thomson Reuters Web of Science Article | Citations
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Created: Fri, 21 Jun 2013, 19:57:34 EST by Mrs Louise Nimwegen on behalf of School of Chemistry & Molecular Biosciences