title: Efficient three-photon luminescence with strong polarization dependence from a scintillating silicate glass co-doped with Gd3+ and Tb3+.
abstract: Efficient three-photon luminescence (3PL) from a scintillating silicate glass co-doped with Gd(3+) and Tb(3+) was generated by using a focused femtosecond laser beam at 800 nm. Four emission bands centered at 496, 541, 583, and 620 nm were identified as the electronic transitions between the energy levels of Tb(3+) followed by three-photon absorption (3PA) in Gd(3+) and Tb(3+) and the resonant energy transfer from Gd(3+) to Tb(3+). More interestingly, a strong polarization dependence of the 3PL was observed and it is ascribed to the polarization dependent 3PA in Gd(3+) and Tb(3+) and/or the angular distribution of photogenerated electrons in the glass.
authors.affiliation: Laboratory of Nanophotonic Functional Materials and Devices, School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China.
authors.forename: Guang-Can
authors.initials: GC
authors.lastname: Li
authors.forename: Cheng-Yun
authors.initials: CY
authors.lastname: Zhang
authors.forename: Hai-Dong
authors.initials: HD
authors.lastname: Deng
authors.forename: Guang-Yin
authors.initials: GY
authors.lastname: Liu
authors.forename: Sheng
authors.initials: S
authors.lastname: Lan
authors.forename: Qi-
authors.initials: Q
authors.lastname: Qian
authors.forename: Zhong-Min
authors.initials: ZM
authors.lastname: Yang
authors.forename: Achanta Venu
authors.initials: AV
authors.lastname: Gopal