Leveraging dual-state emitters (DSEgens) to achieve intense emission in both dilute solutions and the solid state is rapidly emerging as a trending research spot in the field of luminescent materials...
Alkyl
chain-resulted odd–even effects in fluorescence quantum
yield (FLQY) have also been reported in organic luminescent materials
(OLMs). However, the odd–even effects in FLQY caused by the
alkyl substitutes in OLMs are generally very weak, with only single-digit
differences. Here, we report a series of alkyl-substituted dual-state
luminogens (DSEgens) showing extremely high solid-state FLQY in even-numbered
analogues (>90% FLQY) and a dramatically pronounced odd–even
effect in FLQY. The odd–even effect in FLQY is over 26% alternation,
and a maximum of 48% difference in FLQY was observed between the compounds C1 and C2 with a methyl and ethyl substitution,
respectively. C1 and C2 also displayed a
crystallochromy with a 22 nm difference in emission wavelength. In
addition, odd–even effects in the melting point and decomposition
temperature were also observed. With these bright DSEgens, applications
such as specific recognition of picric acid and ultrasensitive trace
water detection have been demonstrated.
Controlling the fluorescence property of organic molecule in aggregation state and understanding the structure-activity relationship are important for developing excellent luminophors with tunable solid emission. Herein, a series of carbazole...
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