title: Synergetic effect of efficient energy transfer and 3D pi-pi stack for white emission based on the block copolymers containing nonconjugated spacer.
abstract: A series of block copolymers containing nonconjugated spacer and 3D pi-pi stacking structure with simultaneous blue-, green-, and yellow-emitting units has been synthesized and characterized. The dependence of the energy transfer and electroluminescence (EL) properties of these block copolymers on the contents of oligo(phenylenevinylene)s has been investigated. The block copolymer (GEO8-BEO-YEO4) with 98.8% blue-emitting oligomer (BEO), 0.8% green-emitting oligomer (GEO), and 0.4% yellow-emitting oligomer (YEO) showed the best electroluminescent performance, exhibiting a maximum luminance of 2309 cd/m(2) and efficiency of 0.34 cd/A. The single-layer-polymer light-emitting diodes device based on GEO2-BEO-YEO4 emitted greenish white light with the CIE coordinates of (0.26, 0.37) at 10 V. The synergetic effect of the efficient energy transfer and 3D pi-pi stack of these block copolymers on the photoluminescent and electroluminescent properties are investigated.
authors.affiliation: Xiangtan University, PR China.
authors.forename: Junjian
authors.initials: J
authors.lastname: Lu
authors.forename: Hui
authors.initials: H
authors.lastname: Li
authors.forename: Bing
authors.initials: B
authors.lastname: Yao
authors.forename: Bin
authors.initials: B
authors.lastname: Zhao
authors.forename: Chao
authors.initials: C
authors.lastname: Weng
authors.forename: Gangtie
authors.initials: G
authors.lastname: Lei
authors.forename: Ping
authors.initials: P
authors.lastname: Shen
authors.forename: Zhiyuan
authors.initials: Z
authors.lastname: Xie
authors.forename: Songting
authors.initials: S
authors.lastname: Tan