title: White light-emitting electrochemical cell.
abstract: We report a light-emitting electrochemical cell (LEC) with air-stable electrodes and a solution-processed single-layer active material that emits warm-white light (CIE coordinates = (0.39, 0.43); color rendering index =83) with significant brightness (B) at a low voltage. The carefully tuned trichromatic device exhibits a short turn-on time (∼5 s to B > 100 cd/m(2)), high efficiency (3.1 cd/A at B = 240 cd/m(2)) and good operational stability (17 h at B > 100 cd/m(2)). We also report a blue LEC with a highly respectable set of device properties in the form of a turn-on time of ∼5 s, an efficiency of 3.6 lm/W and 5.6 cd/A, and an uninterrupted operational lifetime of 25 h. Finally, by analyzing data from trichromatic and monochromatic devices as well as from the constituent fluorescent CPs, we are able to point out a viable path toward further improvements in the performance of the white-emitting LEC.
authors.affiliation: The Organic Photonics and Electronics Group, Department of Physics, Umeå University, SE-901 87 Umeå, Sweden.
authors.forename: Shi
authors.initials: S
authors.lastname: Tang
authors.forename: Junyou
authors.initials: J
authors.lastname: Pan
authors.forename: Herwig
authors.initials: H
authors.lastname: Buchholz
authors.forename: Ludvig
authors.initials: L
authors.lastname: Edman
mesh_terms: D003116:Color; D055664:Electrochemical Techniques / Q000295:instrumentation / Q000379:methods*; D004566:Electrodes; D008027:Light; D011108:Polymers / Q000737:chemistry; D012996:Solutions / Q000737:chemistry
chemical_list: D011108:Polymers; D012996:Solutions