Visible emission of organic-inorganic hybrid EL device using niobium oxide nanoparticles

Recently, we have successfully synthesized niobium oxide nanoparticles (Nb NPs) with a particle size of less than 4 nm by DMF reduction. Nb NPs dispersed in water or alcohol showed blue-pale photoluminescence. We then fabricated organic-inorganic hybrid EL devices using Nb NPs as the emitting layer. These EL devices showed emission in a wide visible region including the red region. We found that Nb NPs have emission centers in the wide visible region and that their emission color may be controlled by the density of nanoparticles due to the Förster-type resonance energy transfer.