1. Near-infrared absorbing cyanine dyes for all-organic optical upconversion devices
- Author
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Frank Nüesch, Marco Cremona, Rafael dos Santos Carvalho, Karen Strassel, Roland Hany, Rian E. Aderne, Sandra Jenatsch, Matthias Diethelm, and Cristiano Legnani
- Subjects
Materials science ,business.industry ,Energy conversion efficiency ,Photodetector ,02 engineering and technology ,General Chemistry ,Photodetection ,Electroluminescence ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,7. Clean energy ,01 natural sciences ,Photon upconversion ,0104 chemical sciences ,Electronic, Optical and Magnetic Materials ,Biomaterials ,Materials Chemistry ,OLED ,Optoelectronics ,Quantum efficiency ,Electrical and Electronic Engineering ,0210 nano-technology ,business ,Visible spectrum - Abstract
The development of near-infrared (NIR) photodetection technologies is driven by emerging applications such as medical imaging or optical sensors for electronic displays and machine vision. An all-organic upconverter (OUD) is a device that converts incident NIR light directly into visible light and consists of a monolithic stack of a NIR organic photodetector (OPD) and a visible organic light-emitting diode (OLED). We present OUDs that consist of NIR heptamethine cyanine dyes/C60 fullerene OPDs and a fluorescent tris(8-hydroxyquinolinato)aluminium (Alq3) OLED. The device metrics of performance are a high external quantum efficiency (EQE) of 43% of the OPD part and an OUD luminance turn-on at low bias voltages of 2 V. The dynamic response of the photocurrent and luminance is linear over a NIR light range corresponding to 26 dB. These OUDs upconvert NIR light at 830 nm to green light with a photon-to-photon conversion efficiency of 0.61%, close to the expected maximum.
- Published
- 2019
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