順丁烯亞醯胺高分子發光二極體:分子量與聚集傾向之研究

The Maleimide Copolymer Light-Emitting Diodes:Influence of the Polymer Molecular Weight and Aggregation Tendency

邱雅文(Ya-wen Chiu)

指導教授 ： 陳錦地 ； 吳春桂

國立中央大學/理學院/化學系/碩士(2007年)

摘要

在本論文中，我們成功地合成了一系列分子量相近的順丁烯亞醯胺共聚高分子衍生物 (M-PT8ML8-F8, PT8ML1-F8, PT1ML8-F8, PT8ML8-F1, M-PT8ML8-SP)，其分子量從32700到52100。儘管沒有明顯的聚集證據，然而，藉由高分子主鏈上不同位置烷基鏈的長度縮短，的確可以增加高分子的玻璃轉移溫度(91-148 oC)。
並且，我們也聚合出兩類(PT8ML8-F8與PT8ML8-SP)，但各有高、中、低三種分子量的順丁烯亞醯胺共聚高分子。從熱性質的結果來看，玻璃轉移溫度和熱裂解溫度與這兩個高分子分子量的高低與並沒有一定的關係。但是，從不同分子量的PT8ML8-F8高分子發光元件量測的比較，我們發現隨著分子量的增加，亮度與效率都隨之減少。而且，從PT8ML8-F8的發光光譜圖，也可以觀察到隨著分子量的增加，螢光或電激發光都有紅位移的趨勢。從元件的電性量測可以讓我們更加地確定，對PT8ML8-F8共聚高分子而言，分子量越小越不容易聚集。共聚高分子薄膜螢光光譜與穿透式電子顯微鏡影像都支持高分子電激發光的定論。

關鍵字

高分子發光二極體 ； 分子量 ； 聚集

並列摘要

In this study, we successfully designed and synthesized a series of new maleimide-based copolymer with similar molecular weight (M-PT8ML8-F8, PT8ML1-F8, PT1ML8-F8, PT8ML8-F1 and PT8ML8-SP), their molecular weight is from 32700 to 52100. Even though no significant red-shifting spectra indicate the difference between those copolymers, however, through shortening the alkyl substituent chain length, enhancement of the glass-transition temperature (Tgs) is clearly achieved (91-148 oC). From the results of thermal analysis, the molecular weight do not affect both Tgs and decomposition temperatures of these maleimide copolymers (Tds). We have also fabricated polymer light-emitting diodes (PLEDs) of PT8ML8-F8 with different molecular weight. Comparing PT8ML8-F8 copolymers having different molecular weight, electroluminescence and power efficiency decrease with the increase of copolymer molecular weight. In addition, electroluminescence of PT8ML8-F8 showed red-shifting with the increase of the molecular weight. The PLED data implied that less aggregation of PT8ML8-F8 copolymer when its molecular weight is smaller. Thin film photoluminescence spectra and TEM images also support the PLED data.

並列關鍵字

PLEDs ； molecular weight ； aggregation

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