Abstract
Three polymorphs of tris(dibenzoylmethane) gallium were characterized by optical microscopy, absorption, photoluminescence (PL) and used for electroluminescent devices (EL). PL spectrum of the thin film is composed of both γ-type yellow emission and β-type blue emission, but only γ-type yellow EL emission was observed, indicating the polymorphic counterpart β-type with weaker π–π interactions was defeated in competition for EL generation. A comparison of the three polymorphic crystal structures reveals that a zigzag channel from intermolecular π–π interaction at a distance of 3.6–3.7 Å to intramolecular bond–bond conjugation may dominate the charge transport and be responsible for the yellow EL emission.
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