主客体掺杂下三联吡啶苯硼酸聚集态调控长寿命室温磷光

Modulation of Long-lived Room-temperature Phosphorence via Aggregation-state Control of a Terpyridine-phenylboronic Acid in a Host-guest Doping System

摘要

研究了4-(([2，2'∶6'，2''-三联吡啶]-4'-基)苯基)硼酸(B-Tpy)在不同聚集状态下的光物理性能. 核磁共振氢谱(¹H NMR)和荧光光谱分析结果表明， B-Tpy 具有聚集诱导发光特性 . 固态 B-Tpy 仅发射蓝色荧光 (401 nm)， 荧光寿命和量子产率分别为2.89 ns和2.79%. 将B-Tpy与硼酸(BA)掺杂并经200 ℃热处理后， 所得复合材料展现出荧光和室温磷光(RTP)双态发射性质， 余辉长达24 s， RTP 寿命为2.14 s. 理论计算结果表明， B-Tpy具有较大的自旋轨道耦合常数[ξ(S₁， T₁)=6.58 cm⁻¹]， 有效促进了系间窜越过程， 从而实现了长寿命RTP发射. 本文研究结果为长寿命有机RTP磷光材料的设计提供了新思路.

Abstract

The photophysical properties of 4-(([2,2′ :6′,2″-terpyridin]-4′-yl)phenyl)boronic acid(B-Tpy) under different aggregation states were investigated. ¹H NMR titration and fluorescence spectroscopy were employed to confirm the aggregation-induced emission(AIE) characteristics. Solid-state B-Tpy exhibits blue fluorescence at 401 nm, with a lifetime of 2.89 ns and a quantum yield of 2.79%. Following the introduction of B-Tpy into boric acid(BA) and subsequent thermal treatment at 200 ℃, the resulting composite material exhibits dual emission of fluorescence and room-temperature phosphorescence(RTP), with an afterglow duration of up to 24 s. Quantitative calculations indicate that B-Tpy possesses a significant spin-orbit coupling constant[ξ(S ₁, T ₁)=6.58 cm ⁻¹], which promotes intersystem crossing, thereby facilitating long-lived RTP emission. This study proposes a novel strategy for long-lived RTP materials.

关键词

有机室温磷光 / 聚集诱导发光 / 主客体掺杂 / 双态发射

Key words

Organic RTP / Aggregation-induced emission（AIE） / Host-guest doping / Dual-state emission

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基金资助

国家自然科学基金(22161012)

贵州省科技厅面上基金([2026]445)