16 February 2004 High-efficiency silole-based molecular organic light-emitting devices using highly conducting polymer anode contacts
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Abstract
We present high efficiency and high luminance molecular organic light-emitting diodes (MOLEDs) using a conducting polymer as a hole-injecting electrode (anode), a CsF/Al bilayer as a cathode, and silole derivatives as an emitter and/or an electron transporter. The conducting polymer films, poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS), were either spin-cast from aqueous dispersions or pre-coated on plastic substrates (courtesy Agfa Gevaert N.V. Belgium). The surface sheet resistance of the conducting polymer films is in the range of 150Ohms/sq ~ 1500 Ohms/sq. MOLEDs fabricated with a low sheet resistance (150 Ohms/sq) conducting polymer as an anode without using an ITO underlayer and CsF/Al as a cathode exhibit very low operating voltages (4.5V @ 100 cd/m2 and 6.5V @ 1,000 cd/m2). This good device performance is attributable to the low sheet resistance of the conducting polymer anode and the high electron mobility of the silole derivative, namely 2,5-bis-(2',2"-bipyridin-6-yl)-1,1-dimethyl-3,4-diphenylsilacyclopentadiene (PyPySPyPy), used as an electron transporter. Efficient electron injection from the CSF/Al cathode to the PyPySPyPy electron injection/transport layer also contributes to better charge balance and improved device efficiency.
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Woohong Kim, Woohong Kim, Leonidas C Palilis, Leonidas C Palilis, Manabu Uchida, Manabu Uchida, Zakya H. Kafafi, Zakya H. Kafafi, "High-efficiency silole-based molecular organic light-emitting devices using highly conducting polymer anode contacts", Proc. SPIE 5214, Organic Light-Emitting Materials and Devices VII, (16 February 2004); doi: 10.1117/12.509646; https://doi.org/10.1117/12.509646
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