Influence of SiO2/TiO2 nanocomposites on dual resonance Förster energy transfer in ternary hybrid thin films

Abstract

The influence of SiO2/TiO2 nanocomposites (STNCs) content on the photoelectric properties of a PFO/MEH-PPV/F7GA ternary hybrid thin film was investigated. A solution blending method was utilized to prepare the ternary hybrid nanocomposites which was then spin coated to make thin films. Tuning of the dual Förster resonance energy transfer (FRET) parameters of the ternary hybrid thin films composed of PFO/MEH-PPV/F7GA was achieved by incorporating various amounts of STNCs. The existence of charge transfer in the ternary system and an enhanced dual FRET from the donor (PFO) to both acceptors (MEH-PPV and F7GA) was demonstrated with the addition of STNCs. The conjugation length of the donor was increased after the addition of the STNCs, resulting in improved charge carrier mobility and therefore an improved organic light-emitting diode device performance. A remarkable increase in the current in the devices was achieved with the addition of STNCs, indicating a reduction in the activation energy and the resistance of the ternary emissive layer in the devices.

Keywords

• Ternary hybrid thin films
• SiO2/TiO2 nanocomposite
• Dual Förster resonance energy transfer
• Organic light emitting diode