title: Exceptionally strong multiphoton-excited blue photoluminescence and lasing from ladder-type oligo(p-phenylene)s.
abstract: We report the synthesis and investigation of multiphoton absorption properties of a novel series of diphenylamino-end-capped ladder-type oligo(p-phenylene)s which exhibit greatly enhanced and efficient multiphoton (from two- to five-photon) upconverted blue photoluminescence with which the record-high intrinsic three-photon absorption cross-section of 4.56 × 10(-76) cm(6) s(2) in the femtosecond regime has been obtained. Exceptionally efficient two- to five-photon-excited lasing in the blue region has also been demonstrated in which the highest two-photon-excited lasing efficiency of 0.34% has been achieved.
authors.affiliation: Department of Physics and Institute of Advanced Materials, Hong Kong Baptist University, Hong Kong, China.
authors.forename: Hai Hua
authors.initials: HH
authors.lastname: Fan
authors.forename: Lei
authors.initials: L
authors.lastname: Guo
authors.forename: King Fai
authors.initials: KF
authors.lastname: Li
authors.forename: Man Shing
authors.initials: MS
authors.lastname: Wong
authors.forename: Kok Wai
authors.initials: KW
authors.lastname: Cheah