title: White light from a single-emitter light-emitting electrochemical cell.
abstract: We report a novel and generic approach for attaining white light from a single-emitter light-emitting electrochemical cell (LEC). With an active-layer comprising a multifluorophoric conjugated copolymer (MCP) and an electrolyte designed to inhibit MCP energy-transfer interactions during LEC operation, we are able to demonstrate LECs that emit broad-band white light with a color rendering index of 82, a correlated-color temperature of 4000 K, and a current conversion efficacy of 3.8 cd/A. It is notable that this single-emitter LEC configuration eliminates color-drift problems stemming from phase separation, which are commonly observed in conventional blended multiemitter devices. Moreover, the key role of the electrolyte in limiting undesired energy-transfer reactions is highlighted by the observation that an electrolyte-free organic light-emitting diode comprising the same MCP emits red light.
authors: The Organic Photonics and Electronics Group, Department of Physics, Umeå University, SE-901 87 Umeå, Sweden.
authors: Shi
authors: S
authors: Tang
authors: Junyou
authors: J
authors: Pan
authors: Herwig A
authors: HA
authors: Buchholz
authors: Ludvig
authors: L
authors: Edman
mesh_terms: D055664:Electrochemical Techniques / Q000295:instrumentation; D004573:Electrolytes / Q000737:chemistry; D008027:Light; D015394:Molecular Structure; D011108:Polymers / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D013696:Temperature
chemical_list: D004573:Electrolytes; D011108:Polymers