含OPV链段和卟啉化合物的聚芴衍生物的合成与光电性能分析-高分子化学与物理专业论文.docxVIP

湘潭大学 湘潭大学硕士论文 含 OPV 链段和卟啉化合物的聚芴衍生物的合成与光电性能研究 II II 至280oC）内均表现出了典型的向列型液晶的织构。分别以聚合物PF-3OPV-3Por、 PF-9OPV-4Por为发光层的单层器件发射出蓝白光以及纯白光，在驱动电压为9V下测得 其色坐标分别为(0.24, 0.29)、(0.29, 0.30)。为了考察这些具有白光发射的单一聚合物在 不同电压下的色稳定性，我 们分别在 7 ， 8 ， 9 和 10 V 的驱动电压下 对 聚 合 物 PF-9OPV-4Por进行了电致发光性能的测试，结果表明，EL光谱基本保持不变，其色坐 标分别为(0.29, 0.33)，(0.29, 0.32)，(0.29, 0.30)，(0.29, 0.29)，这表明在不同电压下该聚 合物具有良好的色稳定性，这一点对于白光材料的应用是非常重要的。 关键词：电致发光; 白光聚合物; 聚芴衍生物; 低聚对苯撑乙烯（OPV）链段 III III Abstract The research progress of light-emitting polymers and the devices have been reviewed systematically in this dissertation. In special, polyfluorene (PF) derivatives were discussed in detail. As is known to all, polyfluorenes are a novel class of semiconductors with many advantages such as easy chemical modification, good stability and high efficiency etc., which are one of the most promising materials in the application of luminescence polymers. Moreover, the liquid crystalline properties enable PF to have the potential application in polarized light emitting fields. In this dissertation, we have designed and synthesized a series of liquid-crystalline polyfluorene derivatives PF-OPVX (X=005, 05, 1) and PF-LOPV05 containing OPV or LOPV segments in the polymer backbone. The single-layer polymer light emitting diodes (PLEDs) devices based on these liquid-crystalline copolymers emitted green light. To realize white emission, we fabricated PLED device based on the mixture BPPL5-1 with the ratio of PF : PF-LOPV05 (5:1). Moreover, we grafted MOPV segments into the side chain of PFs, and yellowish green light was obtained. With the aim to prepare a single liquid-crystalline polymer for white light emission, we incoporated oligo(phenylenevinylene) (OPV) and porphyrin compound (Por) as green- and red-emitting guests, into the host polyfluorene backbone. The liquid crystalline properties, energy transfer effect and the photo- and electroluminescent properties of the resulting copolymers dependent on the contents of the guest species were inve