Journal
ORGANIC ELECTRONICS
Volume 15, Issue 11, Pages 2903-2911Publisher
ELSEVIER
DOI: 10.1016/j.orgel.2014.08.015
Keywords
Organic photodiode; Optical modeling; Narrow absorber; Ketocyanine
Funding
- Australian Research Council (ARC) [DP120103726]
- University of Queensland International Scholarship
- University of Queensland Vice Chancellor's Senior Research Fellowships
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Accurate color reproduction using image sensors requires four narrow-band absorbing photodetectors (blue, green, yellow and red). Current photodetectors use a broadband photodetector in combination with color filters, which generally do not have sufficient wavelength discrimination for illuminant independent color recognition. We have developed a green-sensitive organic photodetector, in which color selection is achieved using a narrow-absorbing ketocyanine chromophore, coupled with a low finesse electro-optical cavity inducing further spectral narrowing. The optimized device contained a bulk heterojunction light-absorbing layer comprised of a ketocyanine dye blended with [6,6]phenyl-C-61-butyric acid methyl ester. The photodetector had a response full width at half maximum of 80 nm centered around 525 nm, and an external quantum efficiency of 15% at -1.0 V, which is the highest so far reported for a narrow band green-absorbing organic photodetector. The performance of this detector is sufficient to meet the specifications required by machine vision systems. Crown Copyright (C) 2014 Published by Elsevier B.V. All rights reserved.
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