Sharply directed emission in microcavity organic light-emitting diodes with a cholesteric liquid crystal film |
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| Authors: | Soon Moon Jeong Ken Ishikawa Goroh Suzaki |
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| Institution: | a Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan
b Nippon Oil Corporation, Central Technical Research Laboratory, 8 Chidori-cho, Naka-ku, Yokohama 231-0815, Japan |
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| Abstract: | A flexible microcavity organic light-emitting diode (OLED) was fabricated and the emitting characteristics were examined. A pair of right- and left-handed cholesteric liquid crystal (CLC) films were attached to the microcavity OLED between aluminum (Al) and silver (Ag). Sharply directed spontaneous emission was observed from microcavity OLEDs, in which a typical luminescent material, 8-hydroxyquinoline aluminum (Alq3), with a broad emission spectrum was used for emitting layer. The introduction of the CLC film improved both the emission bandwidth and directionality, preserving the turn-on voltage and maximum brightness. |
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