Enabling efficient NIR-II luminescence in lithium-sublattice core—shell nanocrystals towards Stark sublevel based nanothermometry

Liu, Songbin; An, Zhe; Huang, J. S.; Zhou, Bo

doi:10.1007/s12274-022-5121-9

Cited by 20 publications

(12 citation statements)

References 44 publications

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“…[1][2][3][4][5][6][7] Various materials have been explored for Ln 3+ doping to achieve efficient upconversion luminescence (UCL) and downshifting luminescence (DSL), including fluoride, oxide, sulfide, and oxysulfide. [8][9][10][11][12][13][14] Among these candidates, lanthanide oxysulfides have attracted particular attention because of their outstanding photochemical properties inheriting from both oxides and sulfides, such as large absorbance, tun-able bandgap, and high photoluminescence (PL), thermoluminescence, and X-ray-excited luminescence efficiency, which make them extremely useful in light-emitting diodes (LEDs), X-ray scintillators, optical storage, and solid-state lasers. [15][16][17][18][19][20] Specifically, Gd 2 O 2 S: Er 3+ bulk phosphor has been demonstrated to be more efficient than the benchmark β-NaYF 4 : Er 3+ in UCL.…”

Section: Introductionmentioning

confidence: 99%

A sandwiched luminescent heterostructure based on lanthanide‐doped Gd₂O₂S@NaYF₄ core/shell nanocrystals

Yang,

Zheng,

Huang

et al. 2023

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Lanthanide (Ln3+) oxysulfide nanocrystals (NCs) have great prospect in many advanced technologies; however, they suffer from a low photoluminescence efficiency due to the volatility of sulfur and deleterious surface quenching effect. Herein, we report a novel sandwiched luminescent heterostructure based on Ln3+‐doped Gd2O2S@NaYF4 core/shell NCs with tunable sulfur content in the sandwich layer. By means of Eu3+ as the sensitive structural probes, we unravel the ligand‐mediated structure control of the NCs from Gd2O3: Ln3+@NaYF4 to Gd2O2S: Ln3+@NaYF4 with tailored S2– deficiency. Such a sandwich‐type core/shell heterostructure enables us to achieve efficient and multicolor downshifting and upconversion luminescence (UCL), with up to 208.8 folds of enhancement in UCL intensity as compared to that of their core‐only counterparts. These findings provide a general approach for the controlled synthesis of lanthanide oxysulfide@fluoride heterostructure, which offers a new way for the materials design towards diverse emerging applications.

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Section: Introductionmentioning

confidence: 99%

A sandwiched luminescent heterostructure based on lanthanide‐doped Gd₂O₂S@NaYF₄ core/shell nanocrystals

Yang,

Zheng,

Huang

et al. 2023

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“…These UCNPs already have been applied in diverse fields such as sensing and detection, [1,2] bioimaging, and diagnostics, [3][4][5][6] photovoltaics and photocatalysis. [7,8] To meet the different requirements for UCL in various application scenarios, great efforts and various methods have been made, including surface passivation, [9][10][11] local structural engineering, [12,13] excitation power manipulation, [14] dye sensitization, [15] and local field effect enhancement, [16] to obtain UCL with desirable characteristics. Among these methods, local structure engineering is an endogenous approach to UCL from upstream tuning.…”

Section: Introductionmentioning

confidence: 99%

Excitation Wavelength‐Dependent Upconversion Luminescence Enhancement in Tm³⁺‐Doped LiErF₄@LiYF₄ System Under High Pressure

Zhang

Lang

Lü

et al. 2023

Advanced Optical Materials

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Local structural engineering is an endogenous approach to modulate upconversion luminescence (UCL) from upstream to meet the needs of specific application scenarios. Herein, high pressure is utilized as a means to modulate the local structure, and the designed LiErF4:0.5%Tm3+@LiYF4 (Er:Tm@Y) nanoparticles with fast energy transfer rates, abundant cross‐relaxation processes, and multiple near‐infrared wavelengths (808, 980, 1530 nm) excitation properties are tailored as local structure‐sensitive hosts. A unique excitation wavelength‐dependent UCL enhancement of Er:Tm@Y upconversion nanoparticles is observed by pressure‐induced local structure distortions. When the pressure of ≈6 GPa is applied, the UCL is enhanced by a factor of 2.6 at 980 nm excitation only. After pressure release, the luminescence diminishes and recovers. Density functional theory calculations show that the symmetry distortion of the LiErF4 crystal reaches a maximum at pressurization to 6 GPa, while a new Er‐4f state emerges, greatly reducing the bandgap from 8.3 to 5.7 eV. Comparative experiments demonstrate that the local symmetry distortion caused by 0.5%Tm3+ doping and the different energy transfer patterns of Er3+ to Tm3+ at different excitations are responsible for this wavelength‐dependent luminescence enhancement.

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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.…”

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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Enabling efficient NIR-II luminescence in lithium-sublattice core—shell nanocrystals towards Stark sublevel based nanothermometry

Cited by 20 publications

References 44 publications

A sandwiched luminescent heterostructure based on lanthanide‐doped Gd₂O₂S@NaYF₄ core/shell nanocrystals

A sandwiched luminescent heterostructure based on lanthanide‐doped Gd₂O₂S@NaYF₄ core/shell nanocrystals

Excitation Wavelength‐Dependent Upconversion Luminescence Enhancement in Tm³⁺‐Doped LiErF₄@LiYF₄ System Under High Pressure

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

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Enabling efficient NIR-II luminescence in lithium-sublattice core—shell nanocrystals towards Stark sublevel based nanothermometry

Cited by 20 publications

References 44 publications

A sandwiched luminescent heterostructure based on lanthanide‐doped Gd2O2S@NaYF4 core/shell nanocrystals

A sandwiched luminescent heterostructure based on lanthanide‐doped Gd2O2S@NaYF4 core/shell nanocrystals

Excitation Wavelength‐Dependent Upconversion Luminescence Enhancement in Tm3+‐Doped LiErF4@LiYF4 System Under High Pressure

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

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A sandwiched luminescent heterostructure based on lanthanide‐doped Gd₂O₂S@NaYF₄ core/shell nanocrystals

A sandwiched luminescent heterostructure based on lanthanide‐doped Gd₂O₂S@NaYF₄ core/shell nanocrystals

Excitation Wavelength‐Dependent Upconversion Luminescence Enhancement in Tm³⁺‐Doped LiErF₄@LiYF₄ System Under High Pressure

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