Cross-relaxation processes and structural modifications in Ga–Ge–S:Er3+ chalcogenide glasses

Ivanova, T. Yu.; Manshina, Alina; Povolotskiy, Alexey V.

doi:10.1016/j.jnoncrysol.2005.03.022

Cited by 6 publications

(2 citation statements)

References 10 publications

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“…Additionally, excitation into these states can come from 4 I 9/2 → 4 I 13/2 : 4 I 9/2 → 2 H 11/2 / 4 S 3/2 cross‐relaxation. [ 41,42 ] From the 2 H 11/2 / 4 S 3/2 states, the excitation energy is either released as green light emission or decays nonradiatively populating the red‐light‐emitting 4 F 9/2 excited state. Dominance of the red upconversion emission seems to indicate that the 2 H 11/2 / 4 S 3/2 → 4 F 9/2 : 4 I 9/2 → 4 F 9/2 cross‐relaxation is responsible for effective depopulation of the 2 H 11/2 / 4 S 3/2 excited states.…”

Section: Resultsmentioning

confidence: 99%

Erbium Single‐Band Nanothermometry in the Third Biological Imaging Window: Potential and Limitations

Hazra

Skripka

Ribeiro

et al. 2020

Advanced Optical Materials

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entail a physical contact with the object or are limited to superficial and macroscale application. In contrast to traditional thermometers, temperature-sensitive photoluminescent nanoprobes, typically referred to as nanothermometers, allow for contactless, fast, and accurate temperature measurement at the sub-micrometer/nanoscale: [5,6] pertinent in the development of state-of-the-art electronics, in situ characterization of materials, unraveling of previously unexplored physical phenomena, and most of all biomedicine. [7-13] In biomedicine, there is a niche for photoluminescent nanothermometers operating in the nearinfrared (NIR) spectral region, within the biological imaging windows (BW-I: 750-950 nm, BW-II: 1000-1350 nm, and BW-III: 1500-1800 nm). [14,15] Biological tissues are partially translucent to NIR light, due to reduced optical scattering and absorption, thus leading to more accurate target visualization in the NIR. While nanothermometers working on the visible side of the optical spectrum are perfectly suited for in vitro microscopy, high-contrast deep-tissue imaging and temperature sensing ex/in vivo requires the development of all NIR nanothermometers (both excitation and emission in the NIR). [16-18] Among photoluminescent nanoprobes, rare-earth nanoparticles (RENPs) are the most studied and arguably the most promising nanothermometers. Over the last decade, NIR excited RENPs operating as nanothermometers in the UV-visible (via the process of upconversion), [19,20] BW-I, [21-26] BW-II, [27,28] and BW-III [17,29] regions have been developed and applied in biomedical research. In the case of the NIR, most BW-II/III nanothermometers rely on intensity-ratio-based nanothermometry between spectrally distant emission bands, such as those of Nd 3+ (1060 nm, 1340 nm)/Yb 3+ (1000 nm), Er 3+ (1550 nm)/Nd 3+ , Er 3+ /Yb 3+ , Tm 3+ (1230 nm)/Yb 3+ , and Nd 3+ /Ho 3+ (1180 nm). In light of the recent concerns about heterogeneous attenuation of these NIR bands by tissues, [16,30] such nanothermometers may lead to faulty temperature readout when applied in subcutaneous studies. One of the proposed workarounds to this issue is to define integration ranges for ratiometric nanothermometry that would be equally attenuated by tissues, thus maintaining their calibration despite the optical inhomogeneity of the tissue. To that effect, spectrally narrow single-band nanothermometry in the BW-II with Nd 3+-doped RENPs holds great promise. [31-35] Near-infrared (NIR) nanothermometers are sought after in biomedicine when it comes to measuring temperatures subcutaneously. Yet, temperature sensing within the third biological imaging window (BW-III), where the highest contrast images can be obtained, remains relatively unexplored. Here, LiErF 4 /LiYF 4 rare-earth nanoparticles (RENPs) are studied as NIR nanothermometers in the BW-III. Under 793 nm excitation, LiErF 4 /LiYF 4 RENPs emit around 1540 nm, corresponding to the 4 I 13/2 → 4 I 15/2 radiative transition of Er 3+. The fine Stark structure of this transition allows to de...

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Section: Resultsmentioning

confidence: 99%

Erbium Single‐Band Nanothermometry in the Third Biological Imaging Window: Potential and Limitations

Hazra

Skripka

Ribeiro

et al. 2020

Advanced Optical Materials

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“…For the latter, r RR min corresponds to R-Se-R connections. In rare-earth glassy materials, a distance r r RR RR min opt is desirable because it will minimise the non-radiative energy transfer between rare-earth ions, thereby helping to optimise the radiative quantum efficiency [14,36].…”

Section: Discussionmentioning

confidence: 99%

Structure of rare-earth chalcogenide glasses by neutron and x-ray diffraction

Drewitt

Salmon

Zeidler

et al. 2017

J. Phys.: Condens. Matter

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The method of neutron diffraction with isomorphic substitution was used to measure the structure of the rare-earth chalcogenide glasses [Formula: see text](Ga X )(GeX ) with [Formula: see text] or Ce and [Formula: see text] or Se. X-ray diffraction was also used to measure the structure of the sulphide glass. The results are consistent with networks that are built from GeX and GaX tetrahedra, and give R-S and R-Se coordination numbers of 8.0(2) and 8.5(4), respectively. The minimum nearest-neighbour R-R distance associated with rare-earth clustering is discussed.

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Silver iodide promoted structural characterization and infrared properties in GeS2–Ga2S3–La2S3 glasses

Liu

Jiao

Zhang

et al. 2019

Infrared Physics & Technology

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Cross-relaxation processes and structural modifications in Ga–Ge–S:Er3+ chalcogenide glasses

Cited by 6 publications

References 10 publications

Erbium Single‐Band Nanothermometry in the Third Biological Imaging Window: Potential and Limitations

Erbium Single‐Band Nanothermometry in the Third Biological Imaging Window: Potential and Limitations

Structure of rare-earth chalcogenide glasses by neutron and x-ray diffraction

Silver iodide promoted structural characterization and infrared properties in GeS2–Ga2S3–La2S3 glasses

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