Abstract
Organic light-emitting diodes have been fabricated using erbium tris(8-hydroxyquinoline) as the emitting layer and N, N ′ - diphenyl- N,N ′ - bis(3-methylphenyl)-1,1 ′ - biphenyl-4,4 ′ -diamine as the hole-transporting layer. Room-temperature electroluminescence was observed at 1.54 μm due to intra-atomic transitions between the 4 I 13/2 and 4 I 15/2 levels in the Er 3+ ion. These results suggest a possible route to producing a silicon-compatible 1.54 μm source technology.