Circularly Polarized Room Temperature Phosphorescence of Chiral Bromoxanthone Using a Chiral Self‐Assembled Liquid Crystal Polymer Frameworks
Circularly Polarized Room Temperature Phosphorescence of Chiral Bromoxanthone Using a Chiral Self‐Assembled Liquid Crystal Polymer Frameworks
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DOI：
10.1002/adom.202303019
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发表时间：
2024-02
影响因子：
9
通讯作者：
Dan Xu;Chao Liu;Hang Li;Yixiang Cheng;Wenhua Zheng
中科院分区：
文献类型：
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作者：
Dan Xu;Chao Liu;Hang Li;Yixiang Cheng;Wenhua Zheng
通过调节液晶介质中的有序螺旋超结构块，手性自组装经常被发现是开发高性能圆偏振发光（CPL）材料的有效策略。在此，报道了基于溴黄酮的两对轴向手性发射体（BBXT-3-Br和BOHXT-3-Br）的设计和合成。通过热退火和光引发聚合将发射体与液晶单体（RM257）混合，展示了手性自组装液晶聚合物（LCP）框架（PRM257）。 BBXT-3-Br@PRM257 和 BOHXT-3-Br@PRM257 均表现出优异的室温磷光（RTP）性能。此外，BBXT-3-Br@PRM257对映体显示出平均寿命（τ）为162.41 ms的余辉，并发射蓝色CPL（λem = 450 nm，ΦFL = 1.3％，|gFL| = 0.071），尽管观察到弱圆偏振RTP（CP-RTP）。有趣的是，具有较少共轭系统的 BOHXT-3-Br@PRM257 发出红色 RTP (τ = 98.83 ms) 和强烈的 CP-RTP (λem = 612 nm，ΦPhos = 0.45%，|gRTP| = 0.057)。
Chiral self‐assembly has often been found to be an efficient strategy for the development of high‐performance circularly polarized luminescent (CPL) materials, through the regulation of the ordered helical superstructure blocks in liquid crystal media. Here, the design and synthesis of two pairs of axially chiral emitters (BBXT‐3‐Br and BOHXT‐3‐Br) are reported based on bromoxanthone. And the chiral self‐assembled liquid crystal polymer (LCP) framework (PRM257) is demonstrated by mixing of the emitters with liquid crystal monomer (RM257) through thermal annealing and photoinitiated polymerization. Both BBXT‐3‐Br@PRM257 and BOHXT‐3‐Br@PRM257 exhibited excellent room temperature phosphorescence (RTP) properties. In addition, BBXT‐3‐Br@PRM257 enantiomers showed afterglow with an average lifetime (τ) of 162.41 ms and emitted blue CPL (λem = 450 nm, ΦFL = 1.3%, |gFL| = 0.071), although weak circularly polarized RTP (CP‐RTP) is observed. Interestingly, BOHXT‐3‐Br@PRM257 with a less conjugated system emits red RTP (τ = 98.83 ms) and also intense CP‐RTP (λem = 612 nm, ΦPhos = 0.45%, |gRTP| = 0.057).