NIR I‐to‐NIR I Time‐Gated Luminescence Detection From Tm 3+ ‐Doped Gd 3 TaO 7 for Deep Tissue Imaging
Abstract
Bioimaging has been employed as a contactless diagnostic technique, with optical imaging (OI) standing out for its high sensitivity and resolution. OI faces challenges, particularly related to the excitation wavelengths that allow deeper tissue penetration. Here, we present a system with temporal resolution that combines time‐gated luminescence (TGL) with both excitation and emission operating within the near‐infrared (NIR) biological transparency window (BW). Using Tm 3+ as a dopant, excitation at 808 nm is performed, a wavelength that benefits from a minimum of water absorption and reduces photodamage to biological tissues. Spherical Tm 3+ ‐doped and Tm 3+ /Yb 3+ co‐doped Gd 3 TaO 7 particles are synthesized with controlled morphology and size. Under 808 nm excitation, Tm 3+ ‐singly doped samples exhibit strong TGL, whereas Yb 3+ co‐doping leads to significantly weaker luminescence. Confocal spectroscopy enables spectra acquisition near the excitation wavelength, shedding light on the emission mechanisms of Tm 3+ . Excitation at 808 nm directly populates the 4 H 6 level of Tm 3+ , followed by a phonon‐assisted one‐photon process. In co‐doped samples, energy transfer from Tm 3+ to Yb 3+ occurs, but inefficient back transfer results in quenching of Tm 3+ emission at 800 nm. These results highlight the feasibility of TGL systems operating within NIR biological windows and underscore their potential for advancing OI applications.
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BibTeX
@article{borges2026itonir,
title = {{NIR I‐to‐NIR I Time‐Gated Luminescence Detection From Tm 3+ ‐Doped Gd 3 TaO 7 for Deep Tissue Imaging}},
author = {Fernanda Borges and Robert Mauricot and Sebastien Moyano and Luan Passini and Marc Verelst and Rogéria Gonçalves},
journal = {Advanced Optical Materials},
year = {2026},
month = aug,
doi = {10.1002/adom.71666},
url = {https://hal.science/hal-05740246v1},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - NIR I‐to‐NIR I Time‐Gated Luminescence Detection From Tm 3+ ‐Doped Gd 3 TaO 7 for Deep Tissue Imaging
AU - Fernanda Borges
AU - Robert Mauricot
AU - Sebastien Moyano
AU - Luan Passini
AU - Marc Verelst
AU - Rogéria Gonçalves
PY - 2026
DA - 2026/08/24
JO - Advanced Optical Materials
DO - 10.1002/adom.71666
UR - https://hal.science/hal-05740246v1
AB - Bioimaging has been employed as a contactless diagnostic technique, with optical imaging (OI) standing out for its high sensitivity and resolution. OI faces challenges, particularly related to the excitation wavelengths that allow deeper tissue penetration. Here, we present a system with temporal resolution that combines time‐gated luminescence (TGL) with both excitation and emission operating within the near‐infrared (NIR) biological transparency window (BW). Using Tm 3+ as a dopant, excitation at 808 nm is performed, a wavelength that benefits from a minimum of water absorption and reduces photodamage to biological tissues. Spherical Tm 3+ ‐doped and Tm 3+ /Yb 3+ co‐doped Gd 3 TaO 7 particles are synthesized with controlled morphology and size. Under 808 nm excitation, Tm 3+ ‐singly doped samples exhibit strong TGL, whereas Yb 3+ co‐doping leads to significantly weaker luminescence. Confocal spectroscopy enables spectra acquisition near the excitation wavelength, shedding light on the emission mechanisms of Tm 3+ . Excitation at 808 nm directly populates the 4 H 6 level of Tm 3+ , followed by a phonon‐assisted one‐photon process. In co‐doped samples, energy transfer from Tm 3+ to Yb 3+ occurs, but inefficient back transfer results in quenching of Tm 3+ emission at 800 nm. These results highlight the feasibility of TGL systems operating within NIR biological windows and underscore their potential for advancing OI applications.
SN - 2195-1071
ER -