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Achieving Dual‐Emissive and Time‐Dependent Evolutive Organic Afterglow by Bridging Molecules with Weak Intermolecular Hydrogen Bonding
Author(s) -
Chen Junru,
Yu Tao,
Ubba Eethamukkala,
Xie Zongliang,
Yang Zhiyong,
Zhang Yi,
Liu Siwei,
Xu Jiarui,
Aldred Matthew P.,
Chi Zhenguo
Publication year - 2019
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201801593
Subject(s) - afterglow , intermolecular force , phosphorescence , materials science , photochemistry , dibenzofuran , hydrogen bond , molecule , moiety , stacking , fluorescence , chemistry , stereochemistry , organic chemistry , optics , physics , gamma ray burst , astronomy
It is discovered that “bridging” traditional persistent room‐temperature phosphorescence (pRTP) dibenzofuran moieties by intermolecular hydrogen bonding can induce interesting photophysical properties. The light‐emitting material 4‐(4‐((4‐methoxyphenyl)sulfonyl)phenyl)dibenzo[b,d]furan (SOBF‐OMe) is synthesized and excitingly shows novel dual‐emissive afterglow material properties in which orange pRTP (at ≈580 nm, 627 ms) from the dibenzofuran moiety and another blue ultralong intermolecular charge transfer emission (≈476 nm, 204 ms, with TADF characteristics) can be detected. Due to the different decay lifetimes, the ratio of the two afterglow emission bands continuously changes. Accordingly, the emission colors are unusually tuned gradually from cold‐white to orange during the afterglow decay process. The blue afterglow emission, which relates to intermolecular interactions, is sensitive to mechanical stimuli and the afterglow emission properties of SOBF‐OMe (single‐emissive or dual‐emissive) can easily be manipulated by grinding/fuming. This single‐component material is a rare example of a light‐emitting compound showing dual‐emissive and real‐time changing afterglow properties in which a rational bridging strategy via weak intermolecular hydrogen bonding is utilized.