title: Flexible and metal-free light-emitting electrochemical cells based on graphene and PEDOT-PSS as the electrode materials.
abstract: We report flexible and metal-free light-emitting electrochemical cells (LECs) using exclusively solution-processed organic materials and illustrate interesting design opportunities offered by such conformable devices with transparent electrodes. Flexible LEC devices based on chemically derived graphene (CDG) as the cathode and poly(3,4-ethylenedioxythiophene) mixed with poly(styrenesulfonate) as the anode exhibit a low turn-on voltage for yellow light emission (V = 2.8 V) and a good efficiency 2.4 (4.0) cd/A at a brightness of 100 (50) cd/m(2). We also find that CDG is electrochemically inert over a wide potential range (+1.2 to -2.8 V vs ferrocene/ferrocenium) and exploit this property to demonstrate planar LEC devices with CDG as both the anode and the cathode.
authors.affiliation: The Organic Photonics and Electronics Group, Department of Physics, Umeå University, SE-901 87 Umeå, Sweden.
authors.forename: Piotr
authors.initials: P
authors.lastname: Matyba
authors.forename: Hisato
authors.initials: H
authors.lastname: Yamaguchi
authors.forename: Manish
authors.initials: M
authors.lastname: Chhowalla
authors.forename: Nathaniel D
authors.initials: ND
authors.lastname: Robinson
authors.forename: Ludvig
authors.initials: L
authors.lastname: Edman
mesh_terms: D019086:Bridged Bicyclo Compounds, Heterocyclic / Q000737:chemistry*; D004560:Electricity; D004563:Electrochemistry; D004566:Electrodes; D006108:Graphite / Q000737:chemistry*; D008027:Light; D011093:Polyethylene Terephthalates / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D011137:Polystyrenes / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D019086:Bridged Bicyclo Compounds, Heterocyclic; D011093:Polyethylene Terephthalates; D011108:Polymers; D011137:Polystyrenes; C121383:poly(3,4-ethylene dioxythiophene); C003321:polystyrene sulfonic acid; D006108:Graphite