title: Highly Efficient Green-Emitting Phosphors Ba2Y5B5O17with Low Thermal Quenching Due to Fast Energy Transfer from Ce3+to Tb3.
abstract: This paper demonstrates a highly thermally stable and efficient green-emitting Ba2Y5B5O17:Ce3+, Tb3+phosphor prepared by high-temperature solid-state reaction. The phosphor exhibits a blue emission band of Ce3+and green emission lines of Tb3+upon Ce3+excitation in the near-UV spectral region. The effect of Ce3+to Tb3+energy transfer on blue to green emission color tuning and on luminescence thermal stability is studied in the samples codoped with 1% Ce3+and various concentrations (0-40%) of Tb3+. The green emission of Tb3+upon Ce3+excitation at 150 °C can keep, on average, 92% of its intensity at room temperature, with the best one showing no intensity decreasing up to 210 °C for 30% Tb3+. Meanwhile, Ce3+emission intensity only keeps 42% on average at 150 °C. The high thermal stability of the green emission is attributed to suppression of Ce3+thermal de-excitation through fast energy transfer to Tb3+, which in the green-emitting excited states is highly thermally stable such that no lifetime shortening is observed with raising temperature to 210 °C. The predominant green emission is observed for Tb3+concentration of at least 10% due to efficient energy transfer with the transfer efficiency approaching 100% for 40% Tb3+. The internal and external quantum yield of the sample with Tb3+concentration of 20% can be as high as 76% and 55%, respectively. The green phosphor, thus, shows attractive performance for near-UV-based white-light-emitting diodes applications.
authors.affiliation: State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences , 3888 Eastern South Lake Road, Changchun 130033, China.|University of Chinese Academy of Sciences , Beijing 100049, China.
authors.forename: Yu
authors.identifier: http://orcid.org/0000-0002-0165-4335
authors.initials: Y
authors.lastname: Xiao
authors.affiliation: State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences , 3888 Eastern South Lake Road, Changchun 130033, China.
authors.forename: Zhendong
authors.initials: Z
authors.lastname: Hao
authors.affiliation: State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences , 3888 Eastern South Lake Road, Changchun 130033, China.
authors.forename: Liangliang
authors.initials: L
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences , 3888 Eastern South Lake Road, Changchun 130033, China.|University of Chinese Academy of Sciences , Beijing 100049, China.
authors.forename: Wenge
authors.identifier: http://orcid.org/0000-0002-3719-9434
authors.initials: W
authors.lastname: Xiao
authors.affiliation: State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences , 3888 Eastern South Lake Road, Changchun 130033, China.|University of Chinese Academy of Sciences , Beijing 100049, China.
authors.forename: Dan
authors.initials: D
authors.lastname: Wu
authors.affiliation: State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences , 3888 Eastern South Lake Road, Changchun 130033, China.
authors.forename: Xia
authors.initials: X
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences , 3888 Eastern South Lake Road, Changchun 130033, China.
authors.forename: Guo-Hui
authors.initials: GH
authors.lastname: Pan
authors.affiliation: State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences , 3888 Eastern South Lake Road, Changchun 130033, China.
authors.forename: Yongshi
authors.initials: Y
authors.lastname: Luo
authors.affiliation: State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences , 3888 Eastern South Lake Road, Changchun 130033, China.
authors.forename: Jiahua
authors.initials: J
authors.lastname: Zhang