Abstract
Organic luminophores that exhibit emission ON-OFF switching under thermal stimulus are prominent candidates for developing high-level information encryption. Herein, the rationally controlled luminescence ON-OFF switching behavior of two carbazole derivatives with identical acceptor by tailoring the π-bridge are demonstrated. CPDI with phenyl π-unit showed aggregation induced emission (AIE) but thermally stimulated emission turn-off, while CTDI with thienyl as π-unit exhibited a totally different aggregation caused quenching (ACQ) and thermally stimulated emission turn-on in the solid-state. Structural characterizations revealed that the difference was derived from the opposite effect that form intermolecular π-π interactions after heating treatment. Based on their opposite thermally stimulated ON-OFF and OFF-ON luminescence switching model, fourth-level information encryption application was achieved.
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