Jpn. J. Appl. Phys. 46 (2007) pp. 1328-1332  |Previous Article| |Next Article|  |Table of Contents|
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Organic Bifunctional Devices with Emission and Sensing Abilities

Hiroyuki Okada, Shigeki Naka, Yohsuke Matsushita, Hiroyuki Shimada, Junya Yanagi, Miki Shibata, and Hiroyoshi Onnagawa

(Received July 7, 2006; accepted September 18, 2006; published online March 16, 2007)

Organic bifunctional devices with emission and sensing abilities were reviewed and a prototype of a matrix was demonstrated. There are two types of device structure: a bi-function matrix array (Bi-Matrix) with a stacked layer of organic light-emitting diode (OLED) and organic photodiode (OPD) matrix arrays, and a multi-function diode (MFD) which has a structure similar to that of conventional OLED and has two functions of emission and photosensing. For the Bi-Matrix, independent operations of emission and photosensing were achieved; the maximum luminance of its OLED was 77,400 cd/m² and the ratio of photoconductivity to dark conductivity was 1×10⁴. A prototype 4×4 Bi-Matrix was also demonstrated. For the MFD, a special organic material, the pyrazoline derivative, was used. The highest luminance obtained was 9,270 cd/m² under a forward bias condition. The highest photocurrent density was 71 µA/cm² and the highest ratio of photo- to dark-conductivity was 1×10⁴ under a reverse-bias condition. Details of the prototype 16×16 MFD matrix were also described.

URL: http://jjap.jsap.jp/link?JJAP/46/1328/
DOI: 10.1143/JJAP.46.1328

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