On the Response Speed of Narrowband Organic Optical Upconversion Devices
Abstract: Organic upconversion devices (OUCs) consist of an organic infrared photodetector and an organic visible light‐emitting diode (OLED), connected in series. OUCs convert photons from the infrared to the visible and are of use in applications such as process control or imaging. Many applications require a fast OUC response speed, namely the ability to accurately detect in the visible a rapidly changing infrared signal. Here, high image‐contrast, narrowband OUCs are reported that convert near‐infrared (NIR) light at 980 and 976 nm with a full‐width at half maximum of 130 nm into visible light. Transient photocurrent measurements show that the response speed decreases when lowering the NIR light intensity. This is contrary to conventional organic photodetectors that show the opposite speed‐versus‐light trend. It is further found that the response speed increases (when using a phosphorescent OLED) or decreases (for a fluorescent OLED) when increasing the driving voltage. To understand these surprising results, an analysis by numerical simulation is conducted. Results show that the response speed behavior is primarily determined by the electron mobility in the OLED. It is proposed that the low electron drift velocity in the emitter layer sets a fundamental limit to the response speed of OUCs.
- Standort
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Deutsche Nationalbibliothek Frankfurt am Main
- Umfang
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Online-Ressource
- Sprache
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Englisch
- Erschienen in
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On the Response Speed of Narrowband Organic Optical Upconversion Devices ; day:06 ; month:06 ; year:2022 ; extent:10
Advanced optical materials ; (06.06.2022) (gesamt 10)
- Urheber
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Hu, Wei‐Hsu
Vael, Camilla
Diethelm, Matthias
Strassel, Karen
Anantharaman, Surendra B.
Aribia, Abdessalem
Cremona, Marco
Jenatsch, Sandra
Nüesch, Frank
Hany, Roland
- DOI
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10.1002/adom.202200695
- URN
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urn:nbn:de:101:1-2022060615400102949779
- Rechteinformation
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Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
- Letzte Aktualisierung
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15.08.2025, 07:23 MESZ
Datenpartner
Deutsche Nationalbibliothek. Bei Fragen zum Objekt wenden Sie sich bitte an den Datenpartner.
Beteiligte
- Hu, Wei‐Hsu
- Vael, Camilla
- Diethelm, Matthias
- Strassel, Karen
- Anantharaman, Surendra B.
- Aribia, Abdessalem
- Cremona, Marco
- Jenatsch, Sandra
- Nüesch, Frank
- Hany, Roland
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