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6 February 2004 Photovoltaic effect of spin-triplet emitters PtOEP and Ir(ppy)3 in organic light emitting diode devices
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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.
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Taiju Tsuboi and Masayuki Tanigawa "Photovoltaic effect of spin-triplet emitters PtOEP and Ir(ppy)3 in organic light emitting diode devices", Proc. SPIE 5215, Organic Photovoltaics IV, (6 February 2004); https://doi.org/10.1117/12.504095
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