التفاصيل البيبلوغرافية
| العنوان: |
Nanocrystalline (HoxY1−x)2Ti2O7 luminophores for short- and mid-infrared lasers. |
| المؤلفون: |
Mrázek, Jan, Kamrádková, Soňa, Buršík, Jiří, Skála, Roman, Bartoň, Ivo, Vařák, Petr, Baravets, Yauhen, Podrazký, Ondřej |
| المصدر: |
Journal of Sol-Gel Science & Technology; Aug2023, Vol. 107 Issue 2, p320-328, 9p |
| مستخلص: |
We present a versatile sol–gel approach for low-phonon nanocrystalline (HoxY1−x)2Ti2O7, x = <0.01, 0.40> exhibiting luminescence within the spectral range 2000–3000 nm. The nanocrystalline structure of (HoxY1−x)2Ti2O7 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)2Ti2O7. 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. Highlights: We present a versatile sol–gel approach to preparing (HoxY1−x)2Ti2O7x = <0.01, 0.40>. The content of Ho3+ ions in the lattice has a major impact on the luminescence properties. The optimal content of Ho3+ ions to maximize the luminescence intensity is identified. Low phonon energy of (HoxY1−x)2Ti2O7 allows the radiative transition at 2860 nm to be activated. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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