Synthesis and Properties of Room-Temperature Phosphorescent Liquid Crystal Copolymers with Linearly Polarized Luminescence Characteristic.
Synthesis and Properties of Room-Temperature Phosphorescent Liquid Crystal Copolymers with Linearly Polarized Luminescence Characteristic.
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DOI：
10.1021/acsami.3c14313
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发表时间：
2023-10
影响因子：
9.5
通讯作者：
Wei Gong;Guiyan Huang;Mengdie Zhou;Chunyan Fan;Yongjie Yuan;Hailiang Zhang
中科院分区：
文献类型：
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作者：
Wei Gong;Guiyan Huang;Mengdie Zhou;Chunyan Fan;Yongjie Yuan;Hailiang Zhang
室温磷光（RTP）液晶材料由于在有机发光二极管、偏振光材料等方面的重要应用而受到广泛关注。如何高效合成纯有机RTP液晶并对其性能进行调控具有重要意义。本文提出了一种简单可行的方法来合成RTP液晶，并通过共聚来调控其性能。我们将含联苯中间体的磷光单体与含二苯并呋喃发色团的磷光单体共聚，构建了RTP液晶共聚物。由于联苯介孔的引入，所有合成的共聚物都表现出液晶的性质。同时，通过改变共聚物的组成，可以调节其RTP性能，包括发光颜色和寿命。随着共聚物中PMDFM0C组分含量的增加，磷光寿命逐渐增加。对于poly(MDFM0C(0.46)-co-MBi18C(0.54))，磷光寿命可达463.0 ms。此外，共聚物中PMDFM0C组分的磷光颜色随共聚物组成的不同而变化，可诱导室温变磷光。此外，液晶共聚物薄膜在取向时可以发出线偏振荧光和线偏振磷光。取向聚MDFM0C(0.46)-co-MBi18C（0.54）薄膜的线极化磷光二向色比和极化比分别为3.33和0.50。
Room-temperature phosphorescent (RTP) liquid crystal materials have garnered considerable attention because of their significant applications in organic light emitting diodes, polarized light emitting materials, and so forth. How to efficiently synthesize pure organic RTP liquid crystals and regulate their performance is of great significance. In this article, we propose a simple and feasible method to synthesize RTP liquid crystals and manipulate their properties through copolymerization. We constructed RTP liquid crystal copolymers by copolymerizing a phosphorescent monomer bearing biphenyl mesogen with a phosphorescent monomer bearing a dibenzofuran chromophore. All the synthesized copolymers show a liquid crystal property because of the introduction of biphenyl mesogen. Meanwhile, by changing the composition of copolymers, it is possible to regulate their RTP performance, including luminescence color and lifetime. As the content of the PMDFM0C component in copolymers increases, the phosphorescence lifetime gradually increases. For poly(MDFM0C(0.46)-co-MBi18C(0.54)), the phosphorescence lifetime can reach 463.0 ms. Moreover, the phosphorescence color of the PMDFM0C component in copolymers changes with the copolymer composition, which can induce variable room-temperature phosphorescence. In addition, when oriented, liquid crystal copolymer films can emit linearly polarized fluorescence and linearly polarized phosphorescence. The linearly polarized phosphorescence dichroic ratio and polarization ratio values of the oriented poly(MDFM0C(0.46)-co-MBi18C(0.54)) film are 3.33 and 0.50, respectively.