Abstract
Organic metal microcavities werefabricated by using full-reflectivity aluminium film andsemi-transparent silver film as cavity mirrors. Unlike conventionalorganic microcavities, such as the typical structure ofglass/DBR/ITO/organic layers/metal mirror, a microcavity with ashorter cavity length was obtained by using two metal mirrors, whereDBR is the distributed Bragg reflector consisting of alternate quarter-wavelayers of high and low refractive index materials. It is realizedthat red, green and blue single-mode electroluminescence (EL) fromthe microcavities with the structure, glass/Ag/TPD/Alq3/Al, areelectrically-driven when the thickness of the Alq3 layerchanges. Compared to a non-cavity reference sample whose EL spectrumpeak is located at 520 nm with a full width at half maximum (FWHM)of 93 nm, the microcavity devices show apparent cavity effects. TheEL spectra of red, green and blue microcavities are peaked at604 nm, 540 nm and 491 nm, with FWHM of 43 nm, 38 nm and 47 nm,respectively.
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