Near-Infrared Luminescence and Energy Transfer Characteristics of Dy<sup>3+</sup>-Tm<sup>3+</sup> Co-Doped Selenide Glasses

Near-infrared emission properties of Dy3+-Tm3+ co-doped Ge-Ga-Sb-Se glasses were investigated. Possible energy transfer routes and the regime of donor decay were discussed. Tm3+ is found to be an efficient sensitizer on the Dy3+:1.34μm luminescence. Probable energy transfer schemes include Tm3+:3H4 → Dy3+: 6F5/2 and Tm3+:3H5 → Dy3+:6F11/2· 6H9/2. The donor (Tm3+) excitation is transferred to an acceptor (Dy3+) by direct interaction or migrates among donors by diffusion-limited regime until it comes into the vicinity of an energy acceptor where direct interaction and transfer occur.

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Broadband Near-Infrared Luminescence in Lead Germanate Glass Triply Doped with Yb3+/Er3+/Tm3+

Materials ◽

10.3390/ma14112901 ◽

2021 ◽

Vol 14 (11) ◽

pp. 2901

Author(s):

Wojciech A. Pisarski ◽

Joanna Pisarska ◽

Radosław Lisiecki ◽

Witold Ryba-Romanowski

Keyword(s):

Energy Transfer ◽

Near Infrared ◽

Infrared Emission ◽

Relaxation Processes ◽

Lead Germanate ◽

Germanate Glass ◽

Transfer Processes ◽

Infrared Luminescence ◽

Near Infrared Emission ◽

Co Doped

This paper deals with broadband near-infrared luminescence properties of lead germanate glass triply doped with Yb3+/Er3+/Tm3+. Samples were excited at 800 nm and 975 nm. Their emission intensities and lifetimes depend significantly on Er3+ and Tm3+ concentrations. For samples excited at 800 nm, broadband emissions corresponding to the overlapped 3H4 → 3F4 (Tm3+) and 4I13/2 → 4I15/2 (Er3+) transitions centered at 1.45 µm and 1.5 µm was identified. Measurements of decay curves confirm reduction of 3H4 (Tm3+), 2F5/2 (Yb3+) and 4I13/2 (Er3+) luminescence lifetimes and the presence of energy-transfer processes. The maximal spectral bandwidth equal to 269 nm for the 3F4 → 3H6 transition of Tm3+ suggests that our glass co-doped with Yb3+/Er3+/Tm3+ is a good candidate for broadband near-infrared emission. The energy transfer from 4I13/2 (Er3+) to 3F4 (Tm3+) and cross-relaxation processes are responsible for the enhancement of broadband luminescence near 1.8 µm attributed to the 3F4 → 3H6 transition of thulium ions in lead germanate glass under excitation of Yb3+ ions at 975 nm.

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Fluoroindate Glass Co-Doped with Yb3+/Ho3+ as a 2.85 μm Luminescent Source for MID-IR Sensing

Sensors ◽

10.3390/s21062155 ◽

2021 ◽

Vol 21 (6) ◽

pp. 2155

Author(s):

Marcin Kochanowicz ◽

Jacek Zmojda ◽

Agata Baranowska ◽

Marta Kuwik ◽

Bartłomiej Starzyk ◽

...

Keyword(s):

Energy Transfer ◽

Near Infrared ◽

Luminescence Spectra ◽

Infrared Source ◽

Mid Infrared ◽

Infrared Luminescence ◽

Infrared Spectral Range ◽

Infrared Spectral ◽

Sensing Application ◽

Co Doped

This work reports on the fabrication and analysis of near-infrared and mid-infrared luminescence spectra and their decays in fluoroindate glasses co-doped with Yb3+/Ho3+. The attention has been paid to the analysis of the Yb3+→ Ho3+ energy transfer processed ions in fluoroindate glasses pumped by 976 nm laser diode. The most effective sensitization for 2 μm luminescence has been obtained in glass co-doped with 0.8YbF3/1.6HoF3. Further study in the mid-infrared spectral range (2.85 μm) showed that the maximum emission intensity has been obtained in fluoroindate glass co-doped with 0.1YbF3/1.4HoF3. The obtained efficiency of Yb3+→ Ho3+ energy transfer was calculated to be up to 61% (0.8YbF3/1.6HoF3), which confirms the possibility of obtaining an efficient glass or glass fiber infrared source for a MID-infrared (MID-IR) sensing application.

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