Abstract
This study investigates the incomplete energy transfer behavior, absorption, and photoluminescence (PL) properties of a white-light-emitting blend film␣spin-coated on indium-tin oxide glass. Poly(9-vinylcarbazole) (PVK), poly[(9,9-dioctyl-2,7-bis(2-cyano)vinylenefluorenylene)-alt-co-(2-methoxy-5- (2-ethylhexyloxy)-1,4-phenylene)] (OPA3008), and poly[2-methoxy-5- (2′-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) are used as blue, green, and orange emitters, respectively. The spectral overlaps between the emission and absorption of the polymers are analyzed. It is revealed that the PVK:OPA3008, OPA3008:MEH-PPV, and PVK:OPA3008:MEH-PPV blends satisfy the requirements of the Forster energy transfer. PVK not only functions as the matrix of the blends but also absorbs the excitation energy and partially transfers it to OPA3008 and MEH-PPV, which results in the emission of white light. The PL excitation spectra are examined for evaluating the energy absorption and transfer behaviors in the polymeric blend films.
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