MICROCAVITY DEVICES BASED ON A LADDER-TYPE POLY(P-PHENYLENE) EMITTINGBLUE, GREEN, AND RED-LIGHT

Light emitting devices with emission either in the blue, green, and re d spectral region have been fabricated based on ladder-type poly(p-phe nylene) (LPPP). Color tuning has been achieved simply by adjusting the LPPP layer thickness. Microcavity effects could be proven to control the shape of the electroluminescence and photoluminescence spectra of the single layer devices between aluminum and gold electrodes. The ful l width at half-maximum was strongly reduced from similar to 150 to 20 0 nm for the ''free space'' photoluminescence or for the electrolumine scence spectra of devices with indium-tin oxide hole injecting electro des to values between 60 and 70 nm for the three individual single col or devices. (C) 1996 American Institute of Physics.