High-performance two-photon absorption luminophores: large action cross sections, free from fluorescence quenching and tunable emission of efficient non-doped organic light-emitting diodes

Abstract

Two novel quadrupolar D–π–D type two-photon absorption (2PA) luminophores PA₂F₄H₈E₈ and AnA₂F₄H₈E₈ were synthesized by Wittig–Horner reaction in high yields. By using distyrylbenzene as the π-bridge center, PA₂F₄H₈E₈ shows two-photon absorption aggregation-induced emission enhancement (2PA-AIEE) and exhibits exceptionally large 2PA and 2PA action cross-sections up to ∼6300 GM and ∼1400 GM at 800 nm in THF, respectively. A non-doped electroluminescent (EL) device of PA₂F₄H₈E₈ displays good performance with an extremely low turn-on voltage of 2.6 V and a high brightness of 9837 cd m⁻².