Crystal structure and luminescence studies of microcrystalline GGG:Bi.sup.3+./sup. and GGG:Bi.sup.3+./sup.,Eu.sup.3+./sup. as a UV-to-VIS converting phosphor for white LEDs

0507927 - FZÚ 2020 RIV NL eng J - Článek v odborném periodiku
Tsiumra, V. - Krasnikov, A. - Zazubovich, S. - Zhydachevskyy, Ya. - Vasylechko, L. - Baran, M. - Wachnicki, L. - Lipinska, L. - Nikl, Martin - Suchocki, A.
Crystal structure and luminescence studies of microcrystalline GGG:Bi³⁺ and GGG:Bi³⁺,Eu³⁺ as a UV-to-VIS converting phosphor for white LEDs.
Journal of Luminescence. Roč. 213, Sep (2019), s. 278-289. ISSN 0022-2313. E-ISSN 1872-7883
Grant CEP: GA MŠMT EF16_013/0001406; GA MŠMT(CZ) LO1409
Grant ostatní: OP VVV - SAFMAT(XE) CZ.02.1.01/0.0/0.0/16_013/0001406
Institucionální podpora: RVO:68378271
Klíčová slova: gadolinium gallium garnet * LED * Bi³⁺ * energy transfer * excitons
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 3.280, rok: 2019
Způsob publikování: Omezený přístup
https://doi.org/10.1016/j.jlumin.2019.05.034

The paper contains detailed crystal structure and photoluminescence studies of the Bi3+ and Bi3+-Eu3+ co-doped Gd3Ga5O12. The studied materials have been synthesized in the form of microcrystalline powders by the common solid-state reaction method. Precise crystal structure parameters were derived from the X-ray powder diffraction data. Photoluminescence studies were done by the steady-state and time-resolved techniques in the 4.2–400 K temperature range. The studied materials show no UV luminescence caused by electronic transitions of a Bi3+ ion. The observed luminescence in visible is interpreted by excitons localized around Bi3+ ions. In particular, two emission bands located at 2.55eV (486nm) and 2.05eV (605nm) at 4.2K were revealed. The main emission band at 2.55eV is attributed to the triplet relaxed state of excitons localized around single Bi3+ ions, whereas the weaker band at 2.05 eV is related to some associates of a single Bi3+ ion with a crystal lattice defect.
Trvalý link: http://hdl.handle.net/11104/0298891