Pr3+ doped NaYF4 and LiYF4 nanocrystals combining visible-to-UVC upconversion and NIR-to-NIR-II downconversion luminescence emissions for biomedical applications

Tsang, Min Ying; Fałat, Patryk; Antoniak, Magda A.; Ziniuk, Roman; Zelewski, Szymon J.; Samoć, Marek; Nyk, Marcin; Qu, Junle; Ohulchanskyy, Tymish Y.; Wawrzyńczyk, Dominika

doi:10.1039/d2nr01680j

Cited by 13 publications

(24 citation statements)

References 70 publications

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“…As the Yb 3+ concentration increases to 5.0 mol %, the intensity of the downconversion emission initially rises but then gradually diminishes as a result of the concentration quenching. In order to further improve the contrast of NIRII imaging, in 2021, Tsang et al reported the synthesis of NaYF 4 and LiYF 4 nanocrystals codoped with Pr 3+ and Yb 3+ . This nanocrystal can realize the downconversion process from 980 to 1320 nm and has high-contrast NIRII imaging capability.…”

Section: Downconversion Processmentioning

confidence: 99%

“…Thus, they have great prospects as optical biological imaging probes. The synthesized bifunctional material allows bactericidal action DNA and RNA damage of the target microorganism or virus induced by UVC and shows high-contrast NIR (1000–1350 nm) imaging ability . They proved that UVC emission from Pr 3+ /Yb 3+ -doped nanocrystals excited by a 447 nm laser leads to the transformation of double-stranded DNA into single-stranded DNA, a process known as DNA unwinding.…”

Section: Applications Of the Photon-to-photon Conversionmentioning

confidence: 99%

“…(c) Reproduced with permission. Copyright, 2022 Nanoscale. (d) Description of an organic SWIR photodiode-based photoplethysmography (PPG) sensor.…”

Section: Applications Of the Photon-to-photon Conversionmentioning

confidence: 99%

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Review of Photon-to-Photon Conversion in Nanoscale Materials and Devices and Its Applications

Rao,

Xu,

Tang

et al. 2023

ACS Appl. Nano Mater.

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The photon-to-photon conversion process has attracted great attention as it can carry out the conversion of photons in different wavelength regions and use the characteristics of different bands to achieve a variety of applications, including solar cells, temperature measurement, information security, luminous display, and biomedicine. According to the process of converting photons of different energy, the photon-to-photon conversion process can be simply divided into two categories: the downconversion process converting high-energy photons to lower-energy photons and the upconversion process converting the low-energy photons to higher-energy photons. Nanoscale materials and devices used in photon-to-photon conversion have been widely concerned and have been successfully applied in many fields, while the corresponding summaries of the representative work are very few as far as we know. In this review, recent advances and progress in photon-to-photon conversion in nanoscale materials and devices and their applications are summarized. Around this field, we then analyzed and summarized the prospects and challenges for its development in the future.

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Section: Downconversion Processmentioning

confidence: 99%

Section: Applications Of the Photon-to-photon Conversionmentioning

confidence: 99%

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Review of Photon-to-Photon Conversion in Nanoscale Materials and Devices and Its Applications

Rao,

Xu,

Tang

et al. 2023

ACS Appl. Nano Mater.

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“… 11 This is, for example, the case when miniaturizing the application, as in microleds. 12 Another important application is in biological experiments, 13 where nanocrystals (NCs) of <50 nm are required. 14 Moreover, optical refrigeration using NCs allows the reduction of the internal temperature remotely.…”

Section: Introductionmentioning

confidence: 99%

Understanding and Preventing Photoluminescence Quenching to Achieve Unity Photoluminescence Quantum Yield in Yb:YLF Nanocrystals

Mulder

Meijer

Blaaderen

et al. 2023

ACS Appl. Mater. Interfaces

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Ytterbium-doped LiYF4 (Yb:YLF) is a commonly used material for laser applications, as a photon upconversion medium, and for optical refrigeration. As nanocrystals (NCs), the material is also of interest for biological and physical applications. Unfortunately, as with most phosphors, with the reduction in size comes a large reduction of the photoluminescence quantum yield (PLQY), which is typically associated with an increase in surface-related PL quenching. Here, we report the synthesis of bipyramidal Yb:YLF NCs with a short axis of ∼60 nm. We systematically study and remove all sources of PL quenching in these NCs. By chemically removing all traces of water from the reaction mixture, we obtain NCs that exhibit a near-unity PLQY for an Yb3+ concentration below 20%. At higher Yb3+ concentrations, efficient concentration quenching occurs. The surface PL quenching is mitigated by growing an undoped YLF shell around the NC core, resulting in near-unity PLQY values even for fully Yb3+-based LiYbF4 cores. This unambiguously shows that the only remaining quenching sites in core-only Yb:YLF NCs reside on the surface and that concentration quenching is due to energy transfer to the surface. Monte Carlo simulations can reproduce the concentration dependence of the PLQY. Surprisingly, Förster resonance energy transfer does not give satisfactory agreement with the experimental data, whereas nearest-neighbor energy transfer does. This work demonstrates that Yb3+-based nanophosphors can be synthesized with a quality close to that of bulk single crystals. The high Yb3+ concentration in the LiYbF4/LiYF4 core/shell nanocrystals increases the weak Yb3+ absorption, making these materials highly promising for fundamental studies and increasing their effectiveness in bioapplications and optical refrigeration.

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“…In this work, we focus on the nucleation and growth of ytterbium-doped LiYF 4 (Yb:YLF), as most of the studied lanthanide-doped LiYF 4 (Ln:YLF) NCs contain a significant fraction of Yb 3+ either as the luminescent ion , or as activator for other lanthanide ions. , Yb:YLF itself is an interesting material for a broad range of optical applications. As bulk Yb:YLF, it is used in lasers, − for photon upconversion (when codoped with other lanthanide ions such as Pr 3+ , Ho 3+ , Er 3+ , or Tm 3+ ) − and optical refrigeration. ,− When synthesized as NCs, its applicability in biological ,− and physical studies ,,,,, increases significantly. This becomes especially relevant when NC samples with a monodisperse size distribution ,, and excellent optical properties ( e.g .…”

Section: Introductionmentioning

confidence: 99%

Nucleation and Growth of Bipyramidal Yb:LiYF₄ Nanocrystals─Growing Up in a Hot Environment

et al. 2023

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Lanthanide-doped LiYF 4 (Ln:YLF) is commonly used for a broad variety of optical applications, such as lasing, photon upconversion and optical refrigeration. When synthesized as nanocrystals (NCs), this material is also of interest for biological applications and fundamental physical studies. Until now, it was unclear how Ln:YLF NCs grow from their ionic precursors into tetragonal NCs with a welldefined, bipyramidal shape and uniform dopant distribution. Here, we study the nucleation and growth of ytterbium-doped LiYF 4 (Yb:YLF), as a template for general Ln:YLF NC syntheses. We show that the formation of bipyramidal Yb:YLF NCs is a multistep process starting with the formation of amorphous Yb:YLF spheres. Over time, these spheres grow via Ostwald ripening and crystallize, resulting in bipyramidal Yb:YLF NCs. We further show that prolonged heating of the NCs results in the degradation of the NCs, observed by the presence of large LiF cubes and small, irregular Yb:YLF NCs. Due to the similarity in chemical nature of all lanthanide ions our work sheds light on the formation stages of Ln:YLF NCs in general.

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Pr³⁺ doped NaYF₄ and LiYF₄ nanocrystals combining visible-to-UVC upconversion and NIR-to-NIR-II downconversion luminescence emissions for biomedical applications

Abstract: Lanthanide-doped fluoride nanocrystals (NCs) are known to exhibit unique optical properties, such as upconversion and downconversion luminescence (UCL and DCL), which can be employed in various applications. In this work,...

Cited by 13 publications

References 70 publications

Review of Photon-to-Photon Conversion in Nanoscale Materials and Devices and Its Applications

Review of Photon-to-Photon Conversion in Nanoscale Materials and Devices and Its Applications

Understanding and Preventing Photoluminescence Quenching to Achieve Unity Photoluminescence Quantum Yield in Yb:YLF Nanocrystals

Nucleation and Growth of Bipyramidal Yb:LiYF₄ Nanocrystals─Growing Up in a Hot Environment

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Pr3+ doped NaYF4 and LiYF4 nanocrystals combining visible-to-UVC upconversion and NIR-to-NIR-II downconversion luminescence emissions for biomedical applications

Abstract: Lanthanide-doped fluoride nanocrystals (NCs) are known to exhibit unique optical properties, such as upconversion and downconversion luminescence (UCL and DCL), which can be employed in various applications. In this work,...

Cited by 13 publications

References 70 publications

Review of Photon-to-Photon Conversion in Nanoscale Materials and Devices and Its Applications

Review of Photon-to-Photon Conversion in Nanoscale Materials and Devices and Its Applications

Understanding and Preventing Photoluminescence Quenching to Achieve Unity Photoluminescence Quantum Yield in Yb:YLF Nanocrystals

Nucleation and Growth of Bipyramidal Yb:LiYF4 Nanocrystals─Growing Up in a Hot Environment

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Product

Resources

About

Pr³⁺ doped NaYF₄ and LiYF₄ nanocrystals combining visible-to-UVC upconversion and NIR-to-NIR-II downconversion luminescence emissions for biomedical applications

Nucleation and Growth of Bipyramidal Yb:LiYF₄ Nanocrystals─Growing Up in a Hot Environment