title: Efficient amplified spontaneous emission from oligofluorene-pyrene starbursts with improved electron affinity property.
abstract: A series of monodisperse starburst molecules as optical gain media have been investigated in detail. The starburst molecules were composed of a pyrene core with four short oligofluorene arms capped by cyanophenyl moieties. The compounds exhibited low amplified spontaneous emission (ASE) thresholds of 30 nJ pulse-1and high maximum net gain coefficient of 55 cm-1under optically pump. Our study demonstrates that the introducing of electron-withdrawing cyanophenyl end-capper onto pyrene centered starburst molecules does not disadvantage their optical gain properties while leading to reduced LUMO level, therefore, improved electron affinity. This study suggested a promising approach for organic gain material synthesis to address the challenge of electrically pumped organic laser.
authors.forename: Qi
authors.initials: Q
authors.lastname: Zhang
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhang
authors.forename: Weidong
authors.initials: W
authors.lastname: Xu
authors.forename: Xiangchun
authors.initials: X
authors.lastname: Li
authors.forename: Jingguan
authors.initials: J
authors.lastname: Liu
authors.forename: Xiangru
authors.initials: X
authors.lastname: Guo
authors.forename: Ruidong
authors.initials: R
authors.lastname: Xia
authors.forename: Wei
authors.initials: W
authors.lastname: Huang