title: Non-coplanar 9,9-diphenyl-substituted oligofluorenes with large two-photon absorption enhancement.
abstract: The non-coplanar substituted phenyl rings at the 9-position of a fluorenyl unit can be involved in pi-electron delocalization in which the resulting oligofluorenes exhibit a very large enhancement of two-photon absorption cross sections up to 2559 GM at 710 nm.
authors.affiliation: Centre for Advanced Luminescence Materials, Hong Kong Baptist University, Kowloon Tong, Hong Kong SAR, China.
authors.forename: Po Lam
authors.initials: PL
authors.lastname: Wu
authors.forename: Ping Fang
authors.initials: PF
authors.lastname: Xia
authors.forename: Zhong Hui
authors.initials: ZH
authors.lastname: Li
authors.forename: Xin Jiang
authors.initials: XJ
authors.lastname: Feng
authors.forename: Hoi Lam
authors.initials: HL
authors.lastname: Tam
authors.forename: King Fai
authors.initials: KF
authors.lastname: Li
authors.forename: Yong
authors.initials: Y
authors.lastname: Jiao
authors.forename: Man Shing
authors.initials: MS
authors.lastname: Wong
authors.forename: Kok Wai
authors.initials: KW
authors.lastname: Cheah
mesh_terms: D005449:Fluorenes / Q000138:chemical synthesis / Q000737:chemistry*; D015394:Molecular Structure; D017785:Photons; D011789:Quantum Theory; D013050:Spectrometry, Fluorescence; D013053:Spectrophotometry; D013056:Spectrophotometry, Ultraviolet; D044366:Transition Temperature
chemical_list: D005449:Fluorenes