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Synthesis and Optoelectronic Property of Electrophosphorescent Green-Light Hyperbranched Polymers

Author: LuoWen
Tutor: YangWei
School: South China University of Technology
Course: Materials Science
Keywords: Ir(ppy)3 carbazole Electrophosphorescent hyperbranched copolymer
CLC: TB34
Type: Master's thesis
Year: 2011
Downloads: 44
Quote: 0
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Abstract


Recently, electrophosphorescent light-emitting diodes (PhPLEDs) have attracted much attention not only because they can utilize both singlet and triplet excitons, thus theoretically 100% internal quantum efficiencies could be achieved, but also for the reason that they can be fabricated to large-area devices by low-cost solution process. Generally, PhPLEDs are prepared by doping phosphorescent dyes into the polymer matrix with the solution-processable way . But the difference between the dyes and the polymers, leads to the serious phase separation in the dye/polymer system. Then rapid efficiency roll-off with the increasing of current densities, thus limits the appliction of these polymer materials. On the other hand, directly introducing the phosphorescent dyes into the polymer chain to prepare the hyperbranched copolymer can greatly suppress intermolecular interaction between the facial iridium complexes. In a word, the electrophosphorescent hyperbranched polymer not only reduced concentration quenching and triplet-triplet (T-T) annihilation, leading to the improved device performances, but also owned the nice solubility and film forming property, low viscosity, and readily modifying the emitting property via introducing the different core, branch, facial group. Hyperbranched copolymer are considered as the candidatants materialsWe find a way to sythesize the green-light-emitting hyperbranched polymers with Ir(ppy)3 complex as core and 3, 6-carbazole-co-2, 6-pyridine as branch. And we introduce the way to prepare 10/20 times scale polymers, the effective and convenient process to purify the polymersThe devices with the phosphorescent copolymers show no remarkable efficiency decay with the increase of current density due to the reduced concentration quenching and triplet-triplet (T-T) annihilation. The integration of phosphorescent complex in hyperbranched polymers can provide a successful molecular design route for solution-processable polymers for PLEDs applications.

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