We investigated the spectral properties of light-emitting diodes based on a deep blue-emitting pyrazoloquinoline dye doped into a poly(N-vinylcarbazole)-based matrix. Even though the electroluminescence (EL) of the host is redshifted and broadened with respect to the emission of the dye, the EL spectrum becomes fully dominated by the dye emission at concentrations of ca. 2wt%. This is attributed to a competition of exciplex formation on the matrix and exciton formation on the dye.
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Łuszczyńska et al. (2006) studied this question.
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