Novel polymeric light-emitting devices based on bipolar copolymers containing quinoline aluminum moieties and N-vinylcarbazole segments

[Display omitted] ► The obtained bipolar copolymers involve Alq 3 moieties and NVK segments. ► The bipolar copolymers have improved hole-transporting ability. ► EL mechanism of the copolymers: charge trapping and Förster energy transfer. ► Effects of substituted group and Alq 3s content on EL of the...

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Bibliographic Details
Published in:Synthetic metals 2011-08, Vol.161 (15), p.1771-1775
Main Authors: Luo, Jian-xin, Yang, Chao-long, Zhou, De-wen, Liang, Li-yan, Lu, Man-geng
Format: Article
Language:English
Subjects:
Application fields
Applied sciences
Bipolar copolymer
Electroluminescence
Electronics
Exact sciences and technology
Optoelectronic devices
Polymer industry, paints, wood
Polymeric light-emitting devices
Quinoline aluminum
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Technology of polymers
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Summary:[Display omitted] ► The obtained bipolar copolymers involve Alq 3 moieties and NVK segments. ► The bipolar copolymers have improved hole-transporting ability. ► EL mechanism of the copolymers: charge trapping and Förster energy transfer. ► Effects of substituted group and Alq 3s content on EL of the copolymers. A series of bipolar copolymers containing quinoline aluminum moieties and N-vinylcarbazole segments exhibited excellent photoluminescence performance and improved hole-transporting ability, were used as light-emitting materials to fabricate polymeric light-emitting devices (PLEDs). Six simple devices with structure of ITO/PEDOT (40 nm)/copolymer (80 nm)/CsF (1.5 nm)/Al (120 nm) were fabricated by solution spin-coating. These devices gave dominant yellow-green emission from quinoline aluminum with excellent stability. Together with electrochemical data, the electroluminescence (EL) mechanism of the devices was studied. Moreover, effects of substituted group and quinoline aluminum's content on the EL properties of the devices were investigated in detail. The results indicate that the device based on the copolymer (P2-1) with substituted group of carbazole and 2 mol% quinoline aluminum possess optimal EL properties with a maximum luminance of 487 cd/m 2 and a peak current efficiency of 0.545 cd/A.
ISSN:0379-6779
1879-3290
DOI:10.1016/j.synthmet.2011.05.029