Nano-Micro Letters

Graded doped structure fabricated by vacuum spray method to improve the luminance of polymer light -emitting diodes

X. Mo1T. Mizokuro2,*, C. Heck1N. Tanigaki1T. Hiraga1 Abstract
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Nano-Micro Letters, , Volume 1, Issue 1, pp 19-22
Publication Date (Web): October 15, 2009 (Article)
DOI:10.5101/nml.v1i1.p19-22

 

Abstract

 


Figure 1 Schematic illustration of the fabrication of polymer films with graded structure prepared by the VS method. The solid and dotted lines show the concentrations of Alq3 and P3HT, respectively.

An increase in luminance of a polymer light-emitting diode (PLED) was obtained by fabricating a graded doping structure using a vacuum spray method. The small electron transport molecule, Tris(8-hydroxyquinolinato) aluminum(III)(Alq3), was graded dispersed along the film in the direction of growth in the hole transport polymer poly(3-hexylthiophene-2,5-diyl) (P3HT, regiorandom) layer of the PLED, despite being dissolved in the same organic solvent as the polymer. The PLED reported here, which is composed of a graded structure, emitted brighter light than PLEDs composed of pure polymer or of a blend of active layers prepared by spin coating and/or vacuum spray methods.


 

Keywords

Polymer light-emitting diodes; Luminance; Graded doped; Vacuum spray

 

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