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Efficient multilayer electroluminescence devices with poly(m-phenylenevinylene-co-2,5-d...
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Efficient multilayer electroluminescence devices with poly(m-phenylenevinylene-co-2,5-dioctyloxy-p-phenylenevinylene) as the emissive layer
作者:
D. O’Brien,
A. Bleyer,
D. G. Lidzey,
D. D. C. Bradley,
T. Tsutsui,
期刊:
Journal of Applied Physics
(AIP Available online 1997)
卷期:
Volume 82,
issue 5
页码: 2662-2670
ISSN:0021-8979
年代: 1997
DOI:10.1063/1.366097
出版商: AIP
数据来源: AIP
摘要:
The use of a new highly luminescent conjugated polymer as an emissive layer in single and multilayer electroluminescence devices is reported. Poly(m-phenylenevinylene-co-2,5 -dioctyloxy-p-phenylenevinylene) [PmPV-co-DOctOPV] was prepared via a Wittig synthesis reaction. The resulting polymer has a high photoluminescence quantum efficiency in the solid state with an emission spectrum peaked at 506 nm (2.45 eV) in the green. Electroluminescence devices were fabricated with an ITO anode and a MgAg cathode. Three different structures were studied: (i) single layer devices containing only PmPV-co-DOctOPV; (ii) double layer devices with PmPV-co-DOctOPV and an evaporated film of 1,3-bis(4-tert-butylphenyl-1,3,4-oxadiazoyl) phenylene [OXD-7] as an electron transport layer; (iii) triple layer devices containing PmPV-co-DOctOPV, OXD-7 and in addition a polyvinylcarbazole hole transport layer. Electroluminescence external quantum efficiencies for these devices were found to be up to 0.08&percent;, 0.55&percent;, and 1&percent;, respectively, corresponding to luminous efficiencies of≈0.5,≈3,and≈6 lm/Wand power efficiencies of8.5×10−5,5.9×10−4,and6.0×10−4 W/W.©1997 American Institute of Physics.
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