Combining an Ionic Transition Metal Complex with a Conjugated Polymer for Wide-Range Voltage-Controlled Light-Emission Color
2015 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 7, no 4, 2784-2789 p.Article in journal (Refereed) Published
We report on voltage-controlled electroluminescence (EL) over a broad range of colors from a two-luminophor (2L) light-emitting electrochemical cell (LEC), comprising a blend of a majority blue-emitting conjugated polymer (blue-CP), a minority red-emitting ionic transition metal complex (red-iTMC), and an ion-transporting compound as the active layer. The EL color is reversibly shifted from red, over orange, pink, and white, to blue by simply changing the applied voltage from 3 to 7 V. An analysis of our results suggests that the low concentration of immobile cations intrinsic to this particular device configuration controls the electron injection and thereby the EL color: at low voltage, electrons are selectively injected into the low-barrier minority red-iTMC, but with increasing voltage the injection into the high-barrier majority blue-CP is gradually improved.
Place, publisher, year, edition, pages
2015. Vol. 7, no 4, 2784-2789 p.
light-emitting electrochemical cell, tunable color, conjugated polymer, ionic transition metal complex, ite emission, charge injection
IdentifiersURN: urn:nbn:se:umu:diva-102291DOI: 10.1021/am507967bISI: 000349137300077PubMedID: 25574684OAI: oai:DiVA.org:umu-102291DiVA: diva2:826031