Journal
NANOTECHNOLOGY
Volume 17, Issue 8, Pages 1858-1861Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/17/8/008
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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.
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