title: Near-quantitative internal quantum efficiency in a light-emitting electrochemical cell.
abstract: A green-light-emitting iridium(III) complex was prepared that has a photoluminescence quantum yield in a thin-film configuration of almost unity. When used in a simple solid-state single-layer light-emitting electrochemical cell, it yielded an external quantum efficiency of nearly 15% and a power efficiency of 38 Lm/W. We argue that these high external efficiencies are only possible if near-quantitative internal electron-to-photon conversion occurs. This shows that the limiting factor for the efficiency of these devices is the photoluminescence quantum yield in a solid film configuration. The observed efficiencies show the prospect of these simple electroluminescent devices for lighting and signage applications.
authors.affiliation: Instituto de Ciencia Molecular, Universidad de Valencia, P.O. Box 22085, ES-46071 Valencia, Spain. henk.bolink@uv.es
authors.forename: Henk J
authors.initials: HJ
authors.lastname: Bolink
authors.forename: Eugenio
authors.initials: E
authors.lastname: Coronado
authors.forename: Rubén D
authors.initials: RD
authors.lastname: Costa
authors.forename: Nora
authors.initials: N
authors.lastname: Lardiés
authors.forename: Enrique
authors.initials: E
authors.lastname: Ortí