,Three-Colour Single-Mode Electroluminescence from Alq3 Tuned by Microcavities

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Organic metal microcavities were fabricated by using full-reflectivity aluminium film and semi-transparent silverfilm as cavity mirrors. Unlike conventional organic microcavities, such as the typical structure of glass/DBR/ITO/-organic layers/metal mirror, a microcavity with a shorter cavity length was obtained by using two metal mirrors,where DBR is the distributed Bragg reflector consisting of alteate quarter-wave layers of high and low refractiveindex materials. It is realized that red, green and blue single-mode electroluminescence (EL) from the micro-cavities with the structure, glass/Ag/TPD/Alqa/A1, are electrically-driven when the thickness of the Alqa layerchanges. Compared to a non-cavity reference sample whose EL spectrum peak is located at 520nm with a fullwidth at half maximum (FWHM) of 93 nm, the microcavity devices show apparent cavity effects. The EL spectraof red, green and blue microcavities are peaked at 604nm, 540nm and 491 nm, with FWHM of 43 nm, 38nm and47nm, respectively.
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