Electroluminescence in nanoporous TiO2 solid-state heterojunctions

We report visible electroluminescence at room temperature in nanoporous TiO2 films using solid-state heterojunction contacts. Electrons are injected from an n-type polymer layer, while hole injection occurs from a conductive SnO2 substrate. As the polymer material penetrates into the TiO2 nanopore s...

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Bibliographic Details
Published in:Nanotechnology 2006-04, Vol.17 (8), p.1858-1861
Main Authors: Könenkamp, R, Word, Robert C, Godinez, M
Format: Article
Language:English
Online Access:Get full text
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Summary:We report visible electroluminescence at room temperature in nanoporous TiO2 films using solid-state heterojunction contacts. Electrons are injected from an n-type polymer layer, while hole injection occurs from a conductive SnO2 substrate. As the polymer material penetrates into the TiO2 nanopore structure a highly non-planar interface with a greatly enlarged area is created. This type of interface establishes very short current paths to the recombination region of the device and allows high carrier fluxes from the electron-injecting contact. The electroluminescence onset occurs at 7 V applied bias, and involves a broad emission band covering most of the visible region with a peak centred at 600 nm.
ISSN:0957-4484
1361-6528
DOI:10.1088/0957-4484/17/8/008