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高分子科学（英文版）
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2026年9期
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Tunable Circularly Polarized Luminescence of Helical Poly(phenylacetylene)s via Side-chain-to-Backbone Förster Resonance Energy Transfer
Tunable Circularly Polarized Luminescence of Helical Poly(phenylacetylene)s via Side-chain-to-Backbone Förster Resonance Energy Transfer
摘要
Intrinsically emissive helical poly(phenylacetylene)s(PPAs)are attractive circularly polarized luminescence(CPL)materials,yet their color tunability and light-harvesting capability remain limited because the emission mainly originates from the backbone excited states.Herein,we construct side-chain/backbone bichromophoric PPA systems to investigate Förster resonance energy transfer(FRET)and its effect on CPL per-formance.Using a pentafluorophenyl ester-functionalized PPA-PFP as a common precursor,planar aromatic donors,pyrene(Py)and naphtha-lene(Nap),and a non-coplanar donor,triphenylamine(TPA),were systematically introduced through activated-ester amidation.Py-PPA and Nap-PPA both underwent efficient donor-to-backbone energy transfer to the emissive cis-cisoid helical backbone,while Py-PPA showed a high-er FRET efficiency and a much more pronounced solid-state CPL enhancement,with a|glum|value of 7×10-2 in the film.In contrast,TPA-PPA ex-hibited conformation-coupled FRET attenuation and emission color switching because the bulky twisted donor destabilized the cis-cisoid back-bone.Further spectroscopic and diffraction studies revealed that the superior CPL performance of Py-PPA originated from the synergistic combi-nation of stronger pendant chiral ordering and more efficient side-chain-to-backbone energy transfer during solution aging and film formation.These results show that donor-pendant modification is an effective way to regulate FRET and CPL in intrinsically emissive PPA systems.
年，卷(期)：
2026, 44(9)
机标分类号：
TP278
O224
F426.61
在线出版日期：
2026年10月16日
