title: Extremely bright full color alternating current electroluminescence of solution-blended fluorescent polymers with self-assembled block copolymer micelles.
abstract: Electroluminescent (EL) devices operating at alternating current (AC) electricity have been of great interest due to not only their unique light emitting mechanism of carrier generation and recombination but also their great potential for applications in displays, sensors, and lighting. Despite great success of AC-EL devices, most device properties are far from real implementation. In particular, the current state-of-the art brightness of the solution-processed AC-EL devices is a few hundred candela per square meter (cd m(-2)) and most of the works have been devoted to red and white emission. In this manuscript, we report extremely bright full color polymer AC-EL devices with brightness of approximately 2300, 6000, and 5000 cd m(-2) for blue (B), green (G), and red (R) emission, respectively. The high brightness of blue emission was attributed to individually networked multiwalled carbon nanotubes (MWNTs) for the facile carrier injection as well as self-assembled block copolymer micelles for suppression of interchain nonradiative energy quenching. In addition, effective FRET from a solution-blended thin film of B-G and B-G-R fluorescent polymers led to very bright green and red EL under AC voltage, respectively. The solution-processed AC-EL device also worked properly with vacuum-free Ag paste on a mechanically flexible polymer substrate. Finally, we successfully demonstrated the long-term operation reliability of our AC-EL device for over 15 h.
authors.affiliation: Department of Materials Science and Engineering, Yonsei University , Seoul 120-749, Republic of Korea.
authors.forename: Sung Hwan
authors.initials: SH
authors.lastname: Cho
authors.forename: Seong Soon
authors.initials: SS
authors.lastname: Jo
authors.forename: Ihn
authors.initials: I
authors.lastname: Hwang
authors.forename: Jinwoo
authors.initials: J
authors.lastname: Sung
authors.forename: Jungmok
authors.initials: J
authors.lastname: Seo
authors.forename: Seok-Heon
authors.initials: SH
authors.lastname: Jung
authors.forename: Insung
authors.initials: I
authors.lastname: Bae
authors.forename: Jae Ryung
authors.initials: JR
authors.lastname: Choi
authors.forename: Himchan
authors.initials: H
authors.lastname: Cho
authors.forename: Taeyoon
authors.initials: T
authors.lastname: Lee
authors.forename: Jin Kyun
authors.initials: JK
authors.lastname: Lee
authors.forename: Tae-Woo
authors.initials: TW
authors.lastname: Lee
authors.forename: Cheolmin
authors.initials: C
authors.lastname: Park