The authors have fabricated organic electroluminescent (EL) diodes wit
h a microcavity structure designed to have a resonance wavelength of 5
00nm, by using a metal reflector and various dielectric reflectors. Th
e emission intensity (spectral power density) is enhanced by a factor
of 5 compared to that of an EL diode without a cavity, and narrow spec
tral width of 8nm was achieved in blue green emission.