title: Visible photon-avalanche upconversion in Ho3+ singly doped beta-Na(Y1.5Na0.5)F6 under 980 nm excitation.
abstract: Visible IR-to-green photon-avalanche upconversion is reported in an Ho3+ singly doped beta-Na(Y1.5Na0.5)F6 crystal under 980 nm excitation. Upconverted green, red, and IR emissions are observed at 540, 645, and 751 nm, respectively. Temporal evolution and excitation power dependent upconversion intensity are measured, suggesting that a photon-avalanche mechanism is responsible for the upconversion process. It is believed that an efficient cross relaxation (5S2,5I8)-->(5I6,5I6) mainly performs the population of 5I6 excited state, resulting in the intense photon-avalanche upconversion emission in the synthesized samples.
authors.affiliation: Institute for Nanophysics and Rare-Earth Luminescence, Xiangtan University, Xiangtan, China.
authors.forename: Xiangfu
authors.initials: X
authors.lastname: Wang
authors.forename: Siguo
authors.initials: S
authors.lastname: Xiao
authors.forename: Yanyan
authors.initials: Y
authors.lastname: Bu
authors.forename: Xiaoliang
authors.initials: X
authors.lastname: Yang
authors.forename: J W
authors.initials: JW
authors.lastname: Ding
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D053844:Lasers, Solid-State; D017785:Photons; D014159:Transducers