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Improvement of radiative efficiency and wavelength-tuning by TPD-doping in organic light emitting diode using Poly [methylmethacrylate-co-(7-(4-trifluoromethyl)coumarin acrylamide)] (PCA)

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, , Citation M Haishi et al 2008 J. Phys.: Conf. Ser. 109 012011 DOI 10.1088/1742-6596/109/1/012011

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1 Doshisha University, 1-3, Tatara-Miyakodani, Kyotanabe-shi, Kyoto 610-0321, Japan

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1742-6596/109/1/012011

Abstract

We fabricated polymer light-emitting diodes (PLEDs) using a low-weight-molecular-doped luminescent material with a ?max in the ultraviolet region. A single layer PLED without low-weight-molecular-doping does not reveal any electroluminescence (EL) signal at all. However, a PLED with doping clearly shows EL signals. This indicates that carrier injection as well as radiative efficiency can be drastically improved by low-weight-molecular-doping. In addition, multilayered PLEDs are found to be very effective to further improve carrier injection.

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10.1088/1742-6596/109/1/012011