Abstract
Photophysical and energy transfer mechanism of the Poly (9,9-di-n-octylflourenyl-2,7-diyl) (PFO)/Fluorol 7GA (F7GA)/Poly [2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) blend thin films were investigated for potential applications as white organic light emitting diodes. The PFO and F7GA contents in the blends were fixed at 15 mg/ml and 0.5 wt% respectively while MEH-PPV contents were varied from 0% to 1.0 wt%. The blends were stirred and subsequently deposited onto indium tin oxide coated glass substrate to form films using spin coating technique. Due to dipole-dipole interaction and electron-hole migration processes, additions up to 0.3 wt% MEH-PPV resulted in intensified emission of the PFO and F7GA. However, further additions of MEH-PPV produced reversal trend resulted from stronger dipoles interaction, inhibition in excitation of PFO molecules as well as restricted electrons-holes migrations. Despite higher contents, MEH-PPV exhibited almost constant emissions, an indication of energy lost through heat dissipation.
•Förster energy transfer is the main mechanism in ternary organic film.•Acceptor content affects the Förster energy transfer and charge migrations.•Dipoles interaction affects energy transfer efficiency between the polymers.