Energy transfer mechanism and optoelectronic properties of (PFO/ TiO2)/Fluorol 7GA nanocomposite thin films

Journal Article

Al-Asbahi, Bandar . 2017

• المجلة \ الصحيفة: Optical Materials
• الصفحات: من 644 إلى 649

مستخلص المنشور

Energy transfer between poly (9,9'-di-n-octylfluorenyl-2,7-diyl) (PFO) as a donor in presence of TiO2
nanoparticles (NPs) and Fluorol 7GA as an acceptor with different weight ratios has been investigated by
steady-state emission measurements. Based on the absorption and fluorescence measurements, the
energy transfer properties, such as quenching rate constant (kSV), energy transfer rate constant (kET),
quantum yield (fDA), and lifetime (tDA), of the donor in the presence of the acceptor, energy transfer
probability (PDA), energy transfer efficiency (h), energy transfer time (tET), and critical distance of the
energy transfer (Ro) were calculated. F€orster-type energy transfer between the excited donor and
ground-state acceptor molecules was the dominant mechanism responsible for the energy transfer as
evidenced by large values of kSV, kET, and Ro. Moreover, these composite materials were employed as an
emissive layer in organic light-emitting diodes (OLEDs). Additionally, the optoelectronic properties of
OLEDs were investigated in terms of current densityevoltage characteristics and electroluminescence
spectra.