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Proceedings Paper

Photovoltaic effect of spin-triplet emitters PtOEP and Ir(ppy)3 in organic light-emitting diode devices
Author(s): Taiju Tsuboi; Masayuki Tanigawa
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Paper Abstract

Photovoltaic effect has been studied on single- and multi-layer OLED devices based on phosphorescent PtOEP and Ir(ppy)3 molecules, together with the electroluminescence (EL). The incident photon to current efficiency (IPCE) spectra of these PtOEP and Ir(ppy)3 devices are similar to the absorption spectra of PtOEP and Ir(ppy)3 molecules, respectively. This indicates that the photovoltaic effect is caused by the optical excitation of PtOEP and Ir(ppy)3 molecules. The single-layer devices show weak EL luminance and low EL efficiency. Although the EL efficiency of the multi-layer Ir(ppy)3 OLED device is high, the IPCE value is quite low, e.g. 0.013% in the single-layer device at the absorption peak wavelength of 386 nm. The same is true for PtOEP OLED, e.g. 0.0425% at the absorption peak wavelength of 371 nm. Such a low IPCE is considered to be due to low carrier mobility of PtOEP and Ir(ppy)3 molecules. It was found that the multi-layer PtOEP and Ir(ppy)3 OLED devices with emitting layer of guest-host system show much less efficient photovoltaic effect than the single-layer devices without guest-host.

Paper Details

Date Published: 6 February 2004
PDF: 8 pages
Proc. SPIE 5215, Organic Photovoltaics IV, (6 February 2004); doi: 10.1117/12.504095
Show Author Affiliations
Taiju Tsuboi, Kyoto Sangyo Univ. (Japan)
Masayuki Tanigawa, Kyoto Sangyo Univ. (Japan)

Published in SPIE Proceedings Vol. 5215:
Organic Photovoltaics IV
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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