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题名: Soluble Electroluminescent Poly(Phenylene vinylene)s with Balanced Electron- and Hole Injections
作者: W. S. Fann
Y. Z. Lee
X. Chen
S. A. Chen
P. K. Wei
贡献者: 國立臺灣海洋大學:光電科學研究所
日期: 2001-01
上传时间: 2018-07-23T08:33:33Z
出版者: J. Am. Chem. Soc.
摘要: Abstract: We report a new route for the design of efficient soluble electroluminescent PPV-based copolymers bearing electron-deficient oxadiazole (OXD) moieties on side chains. The introduction of OXD through a long alkylene spacer with PPV backbone provides a molecular dispersion of OXD in the film; both the side chain OXD and the main chain PPV do retain their own electron-transport and emissive properties, respectively. The use of phenylene vinylene derivatives with asymmetric and branched substituents and a long spacer provides solubility for ease of device fabrication as well as amorphous structure to allow a well-mixing of OXD groups with the main chains. By properly adjusting the OXD content through copolymerization, we can tailor the chemical structure of electroluminescent material to give a balance of hole- and electron injections for various metal cathodes, such that the quantum efficiency is significantly improved and the turn-on voltage is reduced for the devices with aluminum and calcium. For the device with calcium fabricated in open air, a maximum brightness of 15000 cd/m2 at 15 V/100 nm and a maximum luminance efficiency of 2.27 cd/A can be obtained, respectively, about 30 times brighter and 9.4 times more efficient than those with the corresponding homopolymer, poly[2-methoxy-5-(2‘-ethylhexyloxy)-p-phenylenevinylene] (MEH−PPV). The use of physical blends to simulate the copolymers provides no significant improvement, since phase-separation structures appear, causing an inefficient utilization of OXD and sometimes voltage-dependent emission spectra. The present route permits a fabrication of single layer PLED with high brightness, high efficiency, and low turn-on voltage.
關聯: 123(10) pp.2296–2307
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/47467
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