Multicolor‐Tunable and Time‐Dependent Circularly Polarized Room‐Temperature Phosphorescence from Liquid Crystal Copolymers
Multicolor‐Tunable and Time‐Dependent Circularly Polarized Room‐Temperature Phosphorescence from Liquid Crystal Copolymers
复制标题
液晶共聚物的多色可调且时间依赖性圆偏振室温磷光
DOI：
10.1002/adom.202301922
复制
发表时间：
2023-11
影响因子：
9
通讯作者：
Wei Gong;Mengdie Zhou;Lingyu Xiao;Chunyan Fan;Yongjie Yuan;Yongyang Gong;Hailiang Zhang
中科院分区：
文献类型：
--
作者：
Wei Gong;Mengdie Zhou;Lingyu Xiao;Chunyan Fan;Yongjie Yuan;Yongyang Gong;Hailiang Zhang
圆偏振发光（CPL）材料在有机发光二极管、不对称合成等领域具有重要的应用前景。然而，由于三重态激子的不稳定性，如何实现CPL与室温磷光（RTP）的有效结合仍然是一个艰巨的挑战。本文提出了一种简单可行的构建聚合物基CPRTP材料的方法，即通过共聚制备手性磷光液晶。将含手性胆固醇液晶基元的磷光单体与含二苯并呋喃发色团的磷光单体共聚，成功地合成了一系列RTP手性液晶共聚物。由于手性胆固醇液晶基元的引入，共聚物可以形成手性近晶C相液晶。利用它们的选择性反射特性，可以实现高效的CPRTP，其亮度值高达−1.6 × 10−2。此外，共聚物中的两种组分都表现出RTP性质，并且在磷光颜色和寿命方面表现出显着差异。通过改变共聚物的组成，成功地实现了对共聚物磷光性能的调控。因此，成功地制备了可调谐和时间依赖的CPRTP材料。
Circularly polarized luminescent (CPL) materials have significant promising applications in organic light‐emitting diodes, asymmetric synthesis, and other fields. However, due to the instability of triplet‐state excitons, how to achieve an effective combination of CPL with room‐temperature phosphorescence (RTP) remains a formidable challenge. Here, a simple and feasible method for constructing polymer‐based CPRTP materials is proposed by preparing chiral phosphorescent liquid crystals through copolymerization. A series of RTP chiral liquid crystal copolymers are successfully synthesized by copolymerizing phosphorescent monomer bearing chiral cholesterol mesogen with phosphorescent monomer bearing dibenzofuran chromophore. Due to the introduction of chiral cholesterol mesogen, copolymers can form chiral smectic C‐phase liquid crystals. Utilizing their selective reflection characteristic, efficient CPRTP is achieved, with a glum value of up to −1.6 × 10−2. In addition, both components in copolymers exhibit RTP properties and show significant differences in phosphorescence color and lifetime. By changing the composition of copolymers, the regulation of their phosphorescence properties is successfully achieved. As a result, multicolor‐tunable and time‐dependent CPRTP materials are successfully prepared.