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/content/aip/journal/adva/6/4/10.1063/1.4948591
2016-04-29
2016-12-06

Abstract

Mixed host compositions that combine chargetransportmaterials with luminescent dyes offer superior control over exciton formation and chargetransport in organic light emitting devices (OLEDs). Two approaches are typically used to optimize the fraction of chargetransportmaterials in a mixed host composition: either an empirical percolative model, or a hopping transport model. We show that these two commonly-employed models are linked by an analytic expression which relates the localization length to the percolation threshold and critical exponent. The relation is confirmed both numerically and experimentally through measurements of the relative conductivity of Tris(4-carbazoyl-9-ylphenyl)amine (TCTA) :1,3-bis(3,5-dipyrid-3-yl-phenyl)benzene (BmPyPb) mixtures with different concentrations, where the TCTA plays a role as hole conductor and the BmPyPb as hole insulator. The analytic relation may allow the rational design of mixed layers of small molecules for high-performance OLEDs.

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