Wallace C H Choy et al 2008 J. Phys. D: Appl. Phys. 41 025106 doi:10.1088/0022-3727/41/2/025106
Voltage-controlled colour-tunable microcavity OLEDs with enhanced colour purity
Wallace C H Choy1,3, J H Niu1,2, W L Li2 and P C Chui1
Show affiliationsThe emission spectrum of single-unit voltage-controlled colour-tunable organic light emitting devices (OLEDs) has been theoretically and experimentally studied. Our results show that by introducing the microcavity structure, the colour purity of not only the destination colour but also the colour-tunable route can be enhanced, while colour purity is still an issue in typical single-unit voltage-controlled colour-tunable OLEDs. With the consideration of the periodical cycling of resonant wavelength and absorption loss of the metal electrodes, the appropriate change in the thickness of the microcavity structure has been utilized to achieve voltage-controlled red-to-green and red-to-blue colour-tunable OLEDs without adding dyes or other organic materials to the OLEDs.
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Issue 2 (21 January 2008)
Received 9 July 2007, in final form 3 December 2007
Published 21 December 2007
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Voltage-controlled colour-tunable microcavity OLEDs with enhanced colour purity
Wallace C H Choy et al 2008 J. Phys. D: Appl. Phys. 41 025106
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