Tuning and enhancing the red upconversion emission of Er3+ in LiYF4 nanoparticles

Dong, Jun; Zhang, Jie; Han, Qingyan; Zhao, Xing; Yan, Xuewen; Liu, Jihong; Ge, Haibo; Gao, Wei

doi:10.1016/j.jlumin.2018.11.041

Cited by 30 publications

(12 citation statements)

References 36 publications

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“…5c ). These spectral characteristics could be explained by the fact that the red emission process of Er 3+ involves multiphoton process 58 and is sensitive to the power density and Yb 3+ doping concentration 59 . The single-particle brightness data for these UCNPs is plotted in Fig.…”

Section: Resultsmentioning

confidence: 99%

Enhancement of single upconversion nanoparticle imaging by topologically segregated core-shell structure with inward energy migration

Zhang

Wen

et al. 2022

Nat Commun

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Manipulating topological arrangement is a powerful tool for tuning energy migration in natural photosynthetic proteins and artificial polymers. Here, we report an inorganic optical nanosystem composed of NaErF4 and NaYbF4, in which topological arrangement enhanced upconversion luminescence. Three architectures are designed for considerations pertaining to energy migration and energy transfer within nanoparticles: outside-in, inside-out, and local energy transfer. The outside-in architecture produces the maximum upconversion luminescence, around 6-times brighter than that of the inside-out at the single-particle level. Monte Carlo simulation suggests a topology-dependent energy migration favoring the upconversion luminescence of outside-in structure. The optimized outside-in structure shows more than an order of magnitude enhancement of upconversion brightness compared to the conventional core-shell structure at the single-particle level and is used for long-term single-particle tracking in living cells. Our findings enable rational nanoprobe engineering for single-molecule imaging and also reveal counter-intuitive relationships between upconversion nanoparticle structure and optical properties.

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Section: Resultsmentioning

confidence: 99%

Enhancement of single upconversion nanoparticle imaging by topologically segregated core-shell structure with inward energy migration

Zhang

Wen

et al. 2022

Nat Commun

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“…Moreover, the lattice mismatch between an undoped LiYF4 shell and the doped LiYF4 core particle is low which reduces the risk of forming defect states at the core-shell interface. Other shell materials were nevertheless also investigated such as LiGdF4 [65,69], LiLuF4 [71], LiYbF4 [73], SiO2 [63,80], doped LiYF4 [76,77] as well as more complicated particle architectures involving multiple shells [69,74].…”

Section: Introductionmentioning

confidence: 99%

“…Core particle synthesisHOA-based synthesis procedures for nanocrystalline LiYF4 are usually based on the thermal decomposition of trifluoro acetates[63,64,66,67,[78][79][80][81][82][83][84][85][86][87][88][89] or on the reaction of yttrium oleate with either ammonium fluoride and lithium oleate[77] or ammonium fluoride and lithium hydroxide[62,65,[68][69][70][71][72][73][74][75][76]. Here, we prepared the LiYF4 nanoparticles at temperatures above 200 °C via the reaction of ammonium fluoride with rare earth oleates and lithium oleate dissolved in oleic acid/octadecene[62,65,[68][69][70][71][72][73][74][75][76][77]. As usual, an excess of lithium oleate was used corresponding to twice the stoichiometric amount.…”

mentioning

confidence: 99%

LiYF4:Yb/LiYF4 and LiYF4:Yb,Er/LiYF4 core/shell nanocrystals with luminescence decay times similar to YLF laser crystals and the upconversion quantum yield of the Yb,Er doped nanocrystals

et al. 2020

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We developed a procedure to prepare luminescent LiYF4:Yb/LiYF4 and LiYF4:Yb,Er/LiYF4 core/shell nanocrystals with a size of approximately 40 nm revealing luminescence decay times of the dopant ions that approach those of high-quality laser crystals of LiYF4:Yb (Yb:YLF) and LiYF4:Yb,Er (Yb,Er:YLF) with identical doping concentrations. As the luminescence decay times of Yb3+ and Er3+ are known to be very sensitive to the presence of quenchers, the long decay times of the core/shell nanocrystals indicate a very low number of defects in the core particles and at the core/shell interfaces. This improvement in the performance was achieved by introducing two important modifications in the commonly used oleic acid based synthesis. First, the shell was prepared via a newly developed method characterized by a very low nucleation rate for particles of pure LiYF4 shell material. Second, anhydrous acetates were used as precursors and additional drying steps were applied to reduce the incorporation of OH− in the crystal lattice, known to quench the emission of Yb3+ ions. Excitation power density (P)-dependent absolute measurements of the upconversion luminescence quantum yield (ΦUC) of LiYF4:Yb,Er/LiYF4 core/shell particles reveal a maximum value of 1.25% at P of 180 Wcm−2. Although lower than the values reported for NaYF4:18%Yb,2%Er core/shell nanocrystals with comparable sizes, these ΦUC values are the highest reported so far for LiYF4:18%Yb,2%Er/LiYF4 nanocrystals without additional dopants. Further improvements may nevertheless be possible by optimizing the dopant concentrations in the LiYF4 nanocrystals.

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“…In this approach, a definite amount of lanthanide trifluoroacetate is mixed with 1-octadecene (ODE) and OA/oleylamine (OM), then heated around 300 • C under the protection of inert gases (Scheme 4a). This method is mainly used to synthesize alkali lanthanide tetrafluoride UCNPs including NaYF 4 (Radunz et al, 2018;, NaGdF 4 (Skripka et al, 2017;Zhao et al, 2017), NaLuF 4 Su et al, 2016), and LiYF 4 (Dong et al, 2019). Mai et al (2006) first applied this method in 2006 to synthesize high-quality cubic-(α) and hexagonal-(β) NaREF 4 UCNPs.…”

Section: Thermal Decomposition Methodsmentioning

confidence: 99%

Lanthanide ion (Ln³⁺)‐based upconversion sensor for quantification of food contaminants: A review

Rong

Hassan

Ouyang

et al. 2021

Comp Rev Food Sci Food Safe

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The food safety issue has gradually become the focus of attention in modern society. The presence of food contaminants poses a threat to human health and there are a number of interesting researches on the detection of food contaminants. Upconversion nanoparticles (UCNPs) are superior to other fluorescence materials, considering the benefits of large anti‐Stokes shifts, high chemical stability, non‐autofluorescence, good light penetration ability, and low toxicity. These properties render UCNPs promising candidates as luminescent labels in biodetection, which provides opportunities as a sensitive, accurate, and rapid detection method. This paper intended to review the research progress of food contaminants detection by UCNPs‐based sensors. We have proposed the key criteria for UCNPs in the detection of food contaminants. Additionally, it highlighted the construction process of the UCNPs‐based sensors, which includes the synthesis and modification of UCNPs, selection of the recognition elements, and consideration of the detection principle. Moreover, six kinds of food contaminants detected by UCNPs technology in the past 5 years have been summarized and discussed fairly. Last but not least, it is outlined that UCNPs have great potential to be applied in food safety detection and threw new insight into the challenges ahead.

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Tuning and enhancing the red upconversion emission of Er3+ in LiYF4 nanoparticles

Cited by 30 publications

References 36 publications

Enhancement of single upconversion nanoparticle imaging by topologically segregated core-shell structure with inward energy migration

Enhancement of single upconversion nanoparticle imaging by topologically segregated core-shell structure with inward energy migration

LiYF4:Yb/LiYF4 and LiYF4:Yb,Er/LiYF4 core/shell nanocrystals with luminescence decay times similar to YLF laser crystals and the upconversion quantum yield of the Yb,Er doped nanocrystals

Lanthanide ion (Ln³⁺)‐based upconversion sensor for quantification of food contaminants: A review

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Tuning and enhancing the red upconversion emission of Er3+ in LiYF4 nanoparticles

Cited by 30 publications

References 36 publications

Enhancement of single upconversion nanoparticle imaging by topologically segregated core-shell structure with inward energy migration

Enhancement of single upconversion nanoparticle imaging by topologically segregated core-shell structure with inward energy migration

LiYF4:Yb/LiYF4 and LiYF4:Yb,Er/LiYF4 core/shell nanocrystals with luminescence decay times similar to YLF laser crystals and the upconversion quantum yield of the Yb,Er doped nanocrystals

Lanthanide ion (Ln3+)‐based upconversion sensor for quantification of food contaminants: A review

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Lanthanide ion (Ln³⁺)‐based upconversion sensor for quantification of food contaminants: A review