A carrier-injection type organic electroluminescent device includes, provided on a substrate, a transparent anode electrode, and a hole transport layer containing hole-transporting poly(N-vinylcarbazole) and 2,5-bis(1-naphthyl)-oxadiazole, and 3-(2'-benzothiazoyl)-7-diethylaminocoumarin...http://www.google.ca/patents/US5834894?utm_source=gb-gplus-sharePatent US5834894 - Carrier injection type organic electro-luminescent device which emits light in response to an application of a voltage 
