In this paper, we present a study of the photophysical and photochemical effects that influence phosphor-doped polymer light-emitting diodes based on poly(vinlycarbazole). With ultraviolet (UV) light irradiation, the relative concentration of partially overlapping carbazole groups [poly(vinlycarbazole), (p-PVK)] to the fully overlapping conformation (f-PVK) is decreased via photoisomerization, which affects both the energies and the probability of forming singlet versus triplet excitons. As a result, phosphor-doped polymer light-emitting diodes fabricated using UV irradiated PVK exhibited higher efficiencies as compared with control devices (doped PVK without UV light irradiation). These data demonstrate a new route for the production of more efficient electrophosphorescent light-emitting diodes.
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Qian et al. (2008) studied this question.
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