Abstract

Organic light emitting diodes |1| using fluorescent dyes show visible light emission with spectral bands of about 80 nm. The color perception by the human eye is therefore insatisfactory for display applications. Filters or microcavities may reduce this problem, however, they are not practicable for low-cost, fabrication. To overcome these disadvantages, rare-earth complexes with luminescent bandwidths of about 5 to 10 urn have been developed |2|. For green and red electroluminescent devices thin films of the complexes europiuni-tris(l-thenoyl-3-trifiuoracetona1.e)-1.10-phenanthroline (Eu(TTFA)₃Phen) and terbium-tris(l-acetyl-3-acctonate)-1.10-phenanthroline (Tb(ACAC)₃ Phen) have been prepared. Our first realized organic light emitting diodes with the europium complex as emitter exhibit nearly monochromatic red light with a luminance of 2cd/m₂ and drive voltages of about 5 V.

© 1996 IEEE