聚芴( Polyfluorene)，具有良好的熱安定、化學穩定性，且具有很高的螢光量子效率(Fluorescence Quantum Efficiency)，螢光放射波長涵蓋在400～460 nm(藍光)，很適合作為發藍光的結構。但是聚芴光學穩定性不佳，容易有激發雙體、凝集或是分子因氧化生成酮基(Fluorenone)，而改變發光顏色，降低ΦPL而大大限制其應用性。
而在本研究中，主要在高分子側鏈導入樹枝狀結構，並導入分枝點於主鏈，其主要目的是為了聚芴高分子在薄膜熱退火下能夠有效抑制長波長發光。而聚芴命名為PF，線性接0代樹枝狀結構命名為PLG0，線性接1代樹枝狀結構命名為PLG1，分枝結構接0代樹枝狀結構命名為PHG0，分枝結構接1代樹枝狀結構命名為PHG1。在熱性質方面，PF、PLG0、PLG1、PHG0、PHG1的Td分別為469、402、374、413、377℃，皆有不錯之熱穩定性。在氮氣下退火實驗中，PHG1高分子最能夠有效抑制長波長的發光。故導入側鏈基團及主鏈的分枝結構能抑制凝集或激發雙體的產生。而在電化學性質方面，當導入樹枝狀結構為1代之高分子，可以降低HOMO能階。在元件方面，PF、PLG0、PLG1、PHG0、PHG1，起始電壓為4.7 V、5.1 V、5.2 V、4.2 V、4.4 V，最大亮度分別為950 cd/m2、390 cd/m2、72 cd/m2、2106 cd/m2、23 cd/m2，在電激發光光譜中，發現所有聚芴衍生物皆有四個波峰產生。

Fluorene-based conjugated polymers (PFs) have emerged as a very promising class of blue-light emitting materials for use in PLEDs because of their high thermal stability, high electroluminescence quantum efficiencies. However, one drawback has limited the application of polyfluorene in blue PLED. For example, excimer, aggregation and keto defect were observed and the formation of these interaction reduced PL and EL efficiency.
In this study, we prepared dendritic structure in side chain and branch unit in main chain to suppress long wavelength emission under annealing in thin films. Polyfluorene was named as PF. Linear with zero and one generation dendritic structures were named as PLG0 and PLG1, respectively. Hyperbranched with zero and one generation dendritic structures were named as PHG0 and PHG1. The thermal decomposition temperature (Td) of PF, PLG0, PLG1, PHG0 and PHG1 are 469, 402, 374, 413 and 377℃, respectively, and showed good thermal stability. Annealing studies under nitrogen were showed PHG1 couled suppressed long wavelength emission apparently. It proves dendritic group in side chain and branch unit in main chain to suppress aggregation or excimer formation. In electrochemical property of these polymers were investigated. One generation dendritic structure polymers could lower the HOMO energy level. In double layer LED device, the turn-on voltages were 4.7 V, 5.1 V, 5.2 V, 4.2 V and 4.4 V, and maximum luminance was 950 cd/m2, 390 cd/m2, 72 cd/m2, 2106 cd/m2 and 23 cd/m2. The EL spectra of all polyfluorene derivatives showed four emission peaks.

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