We investigate the dependence of the optical spectral properties of the exciplex in a polymer blend consisting of Poly(9,9’-dioctylfluorene-co-benzotiadiazole)(ADS133YE) and poly(9,9’-dioctylfluorene-co-bis-N,N’-(4-butylphenyl)-bis-N,N'-phenyl-l,4-phenylenediamine)(ADS232GE) on the excitation wavelengths and on the composite ratio using steady-state and transient spectroscopy. Experimental results show the most efficient exciplex’s emission at 1:6 (ADS133YE: ADS232GE) in 380 nm.

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