Transparent organic photodiodes stacked with electroluminescence devices

Takahiro Komatsu; Kei Sakanoue; Katsuhiko Fujita; Tetsuo Tsutsui

doi:10.1117/12.616598

3 October 2005 Transparent organic photodiodes stacked with electroluminescence devices

Takahiro Komatsu, Kei Sakanoue, Katsuhiko Fujita, Tetsuo Tsutsui

Proceedings Volume 5938, Organic Photovoltaics VI; 593816 (2005) https://doi.org/10.1117/12.616598
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

Abstract

Stacked devices that consisted of transparent organic photodiodes (TOPDs) and organic electroluminescence devices (OELs) were demonstrated. TOPDs were prepared by poly-(2-methoxy-5- (2'-ethylhexyloxy)-1,4-phenylene vinylene (MEH-PPV) and [6,6]-phenyl C61-butyric acid methyl ester (PCBM) blend films as an active layer and transparent Au cathode (10 nm thick). These TOPDs showed about 45 % transmittance on average in visible light region (380-780 nm) and good correlation between incident light intensity and output photocurrent. Based on these results, the stacked devices were prepared by introducing OELs on TOPDs through a SiO insulating layer. The structure of OELs was ITO/Carbon/TPD/Alq₃/LiF/Al. These stacked devices work as light emitting devices and also photo diodes. Since TOPDs have transparency, OELs can illuminate a paper put on the glass substrate through TOPDs and TOPDs can receive reflective light from the paper. Although the TOPDs also absorb light from OELs directly, the output signals from TOPDs changed according to the black and white pattern of the paper. These results show that the devices act as an image sensor having light emitting layer and light receiving layer in a same area.

Citation Download Citation

Takahiro Komatsu, Kei Sakanoue, Katsuhiko Fujita, and Tetsuo Tsutsui "Transparent organic photodiodes stacked with electroluminescence devices", Proc. SPIE 5938, Organic Photovoltaics VI, 593816 (3 October 2005); https://doi.org/10.1117/12.616598

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