Photovoltaic effect of spin-triplet emitters PtOEP and Ir(ppy)3 in organic light-emitting diode devices

Taiju Tsuboi; Masayuki Tanigawa

doi:10.1117/12.504095

6 February 2004 Photovoltaic effect of spin-triplet emitters PtOEP and Ir(ppy)₃ in organic light emitting diode devices

Taiju Tsuboi, Masayuki Tanigawa

Proceedings Volume 5215, Organic Photovoltaics IV; (2004) https://doi.org/10.1117/12.504095
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

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.

Citation Download Citation

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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KEYWORDS

Organic light emitting diodes

Molecules

Photovoltaics

Electroluminescence

Quantum efficiency

Absorption

Aluminum

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