Abstract
Ter(9,9-diarylfluorene) (TDF) neat film featuring oxygen sensing with advantages of fast response, reversibility and high efficiency is reported. The fast O2 fluorescence quenching process (4.0 × 1010 M−1 s−1) is unique and is mainly due to intact amorphous morphology of the TDF film, providing ample porous sites in nature so that O2 can travel therein freely. This, together with a large S1–T1 energy gap of TDF, leads to efficient O2 sensitization, i.e. the O2 induced S1–T1 intersystem crossing. The sensitivity can be further enhanced up to ∼10-fold and ∼20-fold in amplified spontaneous emission (ASE) and lasing action, respectively. The work thus demonstrated a new class of organic materials suited for high-speed, high-sensitivity oxygen sensing.
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