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Star-shaped hexaaryltriindoles small molecules: Tuning molecular properties towards solution processed organic light emitting devices

dc.contributor.authorCoya, Carmen
dc.contributor.authorRuiz, Constanza
dc.contributor.authorÁlvarez, Ángel Luis
dc.contributor.authorÁlvarez-García, Susana
dc.contributor.authorGarcía-Frutos, Eva M.
dc.contributor.authorGómez-Lor, Berta
dc.contributor.authorAndrés, Alicia de
dc.date.accessioned2014-05-29T07:30:01Z
dc.date.available2014-05-29T07:30:01Z
dc.date.issued2012
dc.identifier.citationStar-shaped hexaaryltriindoles small molecules: Tuning molecular properties towards solution processed organic light emitting devices Coya C., Ruiz C., Alvarez A.L., Alvarez-Garcia S., Garcia-Frutos E.M., Gomez-Lor B., De Andres A. (2012) Organic Electronics: physics, materials, applications, 13 (10) , pp. 2138-2148.
dc.identifier.issn1566-1199
dc.identifier.urihttp://hdl.handle.net/10115/12391
dc.description.abstractWe present a series of differently substituted star-shaped hexaaryltriindoles with tunable light-emitting properties. The deep blue emission is unchanged by donor peripheral substituents while an increasing acceptor character produces a reduction of the optical gap, an increased Stokes shift and eventually leads to the appearance of a new electronic level and to the simultaneous deep blue (413 nm) and green (552 nm) emission in solution. Quenching by concentration increases with the acceptor character but is lower as the tendency of these compounds to aggregate is stronger. Solution processed thin films present optical and morphological qualities adequate for device fabrication and similar electronic structure compared to solutions with an emission range from 423 nm up to 657 nm (red), demonstrating the possibility of tuning the energy levels by chemical functionalization. We have fabricated and characterized single-layer solution processed organic light emitting diodes (OLED) to investigate the influence on transport and emission properties of the substituting species. We analyzed the I¿V response using a single-carrier numerical model that includes injection barriers and non-uniform electric-field across the layer. As a result, we obtained the electric field dependence of the mobility for each device. Best results are obtained on the most electron rich derivative functionalized with six donor methoxy groups. This material shows the highest emission efficiency in solid state, due to aggregation-induced enhancement, and better transport properties with the highest mobility and a very low turn-on voltage of 2.8 V. The solution processed OLED devices produce stable deep blue (CIE coordinates (0.16, 0.16)) to white (CIE coordinates (0.33, 0.3)) emission with similar luminous efficiencies.es
dc.language.isoenges
dc.publisherElsevieres
dc.relationS2009/MAT-1756
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/*
dc.subjectMaterialeses
dc.subjectQuímicaes
dc.subjectSolution processinges
dc.subjectMolecular OLEDes
dc.subjectBlue emitterses
dc.titleStar-shaped hexaaryltriindoles small molecules: Tuning molecular properties towards solution processed organic light emitting deviceses
dc.typeinfo:eu-repo/semantics/articlees
dc.identifier.doi10.1016/j.orgel.2012.06.018es
dc.rights.accessRightsinfo:eu-repo/semantics/openAccesses
dc.subject.unesco3307 Tecnología Electrónicaes
dc.subject.unesco23 Químicaes
dc.description.departamentoTecnología Electrónica


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