Nanocrystalline (HoxY1-x)(2)Ti2O7 luminophores for short- and mid-infrared lasers

0574987 - ÚFE 2024 RIV US eng J - Journal Article
Mrázek, Jan - Kamrádková, Soňa - Buršík, Jiří - Skála, Roman - Bartoň, Ivo - Vařák, Petr - Baravets, Yauhen - Podrazký, Ondřej
Nanocrystalline (HoxY1-x)(2)Ti2O7 luminophores for short- and mid-infrared lasers.
Journal of Sol-Gel Science and Technology. Roč. 107, č. 2 (2023), s. 320-328. ISSN 0928-0707. E-ISSN 1573-4846
R&D Projects: GA ČR(CZ) GA22-17604S
Institutional support: RVO:67985882 ; RVO:67985831 ; RVO:68081723
Keywords : Sol-gel * Nanocrystals * Luminophore * Infrared * Pyrochlore * Holmium
OECD category: Optics (including laser optics and quantum optics); Optics (including laser optics and quantum optics) (GLU-S); Condensed matter physics (including formerly solid state physics, supercond.) (UFM-A)
Impact factor: 2.5, year: 2022
Method of publishing: Limited access
https://link.springer.com/article/10.1007/s10971-023-06113-x

We present a versatile sol-gel approach for low-phonon nanocrystalline (HoxY1-x)(2)Ti2O7, x = <0.01, 0.40> exhibiting luminescence within the spectral range 2000-3000 nm. The nanocrystalline structure of (HoxY1-x)(2)Ti2O7 was studied and the effect of the composition and phonon energy on the luminescence properties was evaluated. Regular distribution of Ho3+ ions inside the pyrochlore crystal lattice was proved leading to a regular increase of the unit cell parameter. The luminescence intensity recorded at 2025 nm reached a maximum for the composition (Ho0.03Y0.96)(2)Ti2O7. The radiative lifetime recorded at 2025 nm regularly decreased with increasing content of Ho3+ ions inside the pyrochlore lattice from 6.32 to 0.22 ms. The phonon energy of the samples was smaller than 700 cm(-1) allowing the luminescence spectral range to be extended up to 2900 nm. Further tailoring of the chemical composition can improve the emission at 2860 nm providing a promising high thermally and chemically stable alternative to conventional fluoride or chalcogenide glasses.
Permanent Link: https://hdl.handle.net/11104/0344867