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Hashimoto, Atsunori (author), Ueda, Jumpei (author), Aoki, Yasushi (author), Dorenbos, P. (author), Tanabe, Setsuhisa (author)RE<sub>2</sub>O<sub>2</sub>S:Eu<sup>3+</sup>-Ln<sup>3+</sup> (RE = La, Gd, Y, Lu; Ln = Pr, Tb) samples were prepared by a solid-state reaction method to develop new red persistent phosphors and to demonstrate the hole detrapping mechanism. All Eu<sup>3+</sup>-singly doped RE<sub>2</sub>O<sub>2</sub>S show very weak thermoluminescence (TL)...journal article 2023
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Katayama, Y. (author), Kayumi, T. (author), Ueda, J. (author), Dorenbos, P. (author), Viana, B (author), Tanabe, S (author)In this paper, Mn2+ and Ln3+ (Ln = Eu, Yb) co-doped MgGeO3 phosphors were prepared using a solid state reaction technique, and their optical properties were investigated. Mn2+-doped samples exhibit persistent luminescence in the red region, peaking at 677 nm, because of the 4T1 → 6A1 transition of the Mn2+ ions under ultraviolet (UV) excitation....journal article 2017
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Ueda, J. (author), Meijerink, Andries (author), Dorenbos, P. (author), bos, A.J.J. (author), Tanabe, Setsuhisa (author)We investigated thermally activated ionization and thermally activated crossover as the two possibilities of quenching of 5d luminescence in Pr3+-doped Y3Al5-xGaxO12. Varying the Ga content x gives the control over the relative energy level location of the 5d and 4f2:PJ3 states of Pr3+ and the host conduction band (CB). Temperature-dependent...journal article 2017
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Ueda, J. (author), Hashimoto, Atsunori (author), Takemura, Shota (author), Ogasawara, Kazuyoshi (author), Dorenbos, P. (author), Tanabe, Setsuhisa (author)The Y<sub>3</sub>Al<sub>5−x</sub>Ga<sub>x</sub>O<sub>12</sub>(YAGG):Ce<sup>3+</sup>-Cr<sup>3+</sup> persistent phosphor is one of the materials in which Cr<sup>3+</sup> ions act as electron traps. The possibility of electron traps by other transition metal ions (TM<sup>3+</sup>, TM = Sc, Ti, V, Cr, Fe) was investigated and those electron trap...journal article 2017