期刊
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
卷 16, 期 3, 页码 395-400出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jiec.2009.08.003
关键词
Organic light emitting diode; Molecular weight; Heck coupling reaction; Copolymer
资金
- Konkuk University
In the present work poly[9,9-dioctylfluorene-co-2-pentyl-9,10-bis(4-vinylphenyl)anthracene], a fluorene- and anthracene-based copolymer, is synthesized through a Heck coupling reaction. In order to synthesize polymers with high-molecular weight, DMF (P1), DMF/p-Xylene = 1/1 (P2), p-Xylene (P3), and 1,4-Dioxane (P4) are used as solvents, which are an important factor in the synthesis process. The number of average molecular weights (Me) of the synthesized polymers P1-P4 do not differ significantly, standing at 22,309, 12,369, 29,192, and 39,464, respectively, while their weight average molecular weights (M(w)) show considerable differences (i.e. 50,055; 24,042; 125,406; and 231,053). Polymers P1-P4 demonstrate little difference in the results of a thermal analysis, electrochemical analysis, UV-vis analysis, and photoluminescence (PL) spectrum measurement. With regard to electroluminescence (EL) spectrum measurement, however, P1 and P2 show main luminous peaks at 508 nm, while P3 and P4's luminous peaks are seen at 516 nm. Moreover, luminous shoulder peaks were red-shifted with increase of molecular weight of polymers from 460 to 544 nm. In this process, the luminous area is red-shifted from greenish-blue to yellowish-green. The I-V-L measurement results show that the maximum brightness of P1, P2, and P3 ranges from 164 to 303 cd/m(2) and their luminous efficiency is low at 0.031-0.054 cd/A. Meanwhile, the turn-on voltage of P4, having greater molecular weight, is 9.5 V. and its maximum brightness and corresponding luminous efficiency are 736 cd/m(2) and 0.08 cd/A, respectively, implying that the luminous efficiency of devices improves as the molecular weight becomes greater. (C) 2010 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据