HF-Free synthesis of colloidal Cs2ZrF6 and (NH4)2ZrF6 nanocrystals

Tzanetopoulos, Eden; Schwartz, Julie; Gamelin, Daniel R.

doi:10.1039/d3cc00374d

Cited by 1 publication

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“…However, only a few studies have reported theoretical predictions or experimental preparations of Mn 4+ /Mn 2+ ‐activated red‐emitting phosphors based on the Cs 2 ZrF 6 host. [ 32–35 ] Although recent research presented the fabrication of Cs 2 ZrF 6 NCs, [ 36 ] there is currently no report available for the controlled synthesis, UCL properties, and applications of Cs 2 ZrF 6 ‐based UCNCs.…”

Section: Introductionmentioning

confidence: 99%

Thermal Enhancement of Upconversion in Sub‐10 nm Yb³⁺/Er³⁺/Na⁺ Tridoped Cs₂ZrF₆ Nanocrystals for Ratiometric Temperature Sensing

Hu,

Li,

Xie

et al. 2024

Advanced Optical Materials

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Alkaline zirconium fluorides (AxZryFx+y, A = Li, Na, and K), featuring unique crystallographic structures, have recently emerged as a class of attractive hosts for fabricating lanthanide (Ln3+)‐doped upconversion nanocrystals (UCNCs) that exhibited distinct morphology, upconversion luminescence (UCL) performance, and physicochemical property. In this paper, for the first time the controlled preparation of Yb3+/Er3+‐doped UCNCs is reported based on the trigonal Cs2ZrF6 host, leading to tunable morphology and size of the resulting UCNCs by varying the reaction temperature and time. By further incorporating Na+ ions into the Cs2ZrF6 crystal lattice, sub‐10 nm Yb3+/Er3+/Na+ tridoped UCNCs with highly improved crystallinity and thus greatly enhanced UCL intensity are obtained. Moreover, these resulting UCNCs display abnormal thermal enhancement of UCL over a temperature range from 333 to 493 K, enabling the fabrication of supersensitive luminescent nanothermometers for temperature sensing. Based on the luminescence intensity ratio of two nonthermally coupled levels (i.e., 4F9/2 and 2H11/2) of Er3+, the as‐prepared Cs2ZrF6:Yb/Er/Na UCNCs exhibit an extremely large absolute sensitivity of 177.3% K−1 and a considerably high relative sensitivity of 1.52% K−1 at 333 K. These results unambiguously demonstrate that Cs2ZrF6 is a suitable host material for preparing small‐sized Ln3+‐doped UCNCs as nanothermometer for high‐performance ratiometric temperature sensing.

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Section: Introductionmentioning

confidence: 99%

Thermal Enhancement of Upconversion in Sub‐10 nm Yb³⁺/Er³⁺/Na⁺ Tridoped Cs₂ZrF₆ Nanocrystals for Ratiometric Temperature Sensing

Hu,

Li,

Xie

et al. 2024

Advanced Optical Materials

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HF-Free synthesis of colloidal Cs₂ZrF₆ and (NH₄)₂ZrF₆ nanocrystals

Abstract: A solution-phase hot-injection synthesis of colloidally stable A2BF6 nanocrystals is reported for the first time, focusing on A = Cs+, NH4+ and B = Zr4+. Handling hypertoxic HF is avoided...

Cited by 1 publication

References 38 publications

Thermal Enhancement of Upconversion in Sub‐10 nm Yb³⁺/Er³⁺/Na⁺ Tridoped Cs₂ZrF₆ Nanocrystals for Ratiometric Temperature Sensing

Thermal Enhancement of Upconversion in Sub‐10 nm Yb³⁺/Er³⁺/Na⁺ Tridoped Cs₂ZrF₆ Nanocrystals for Ratiometric Temperature Sensing

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HF-Free synthesis of colloidal Cs2ZrF6 and (NH4)2ZrF6 nanocrystals

Abstract: A solution-phase hot-injection synthesis of colloidally stable A2BF6 nanocrystals is reported for the first time, focusing on A = Cs+, NH4+ and B = Zr4+. Handling hypertoxic HF is avoided...

Cited by 1 publication

References 38 publications

Thermal Enhancement of Upconversion in Sub‐10 nm Yb3+/Er3+/Na+ Tridoped Cs2ZrF6 Nanocrystals for Ratiometric Temperature Sensing

Thermal Enhancement of Upconversion in Sub‐10 nm Yb3+/Er3+/Na+ Tridoped Cs2ZrF6 Nanocrystals for Ratiometric Temperature Sensing

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HF-Free synthesis of colloidal Cs₂ZrF₆ and (NH₄)₂ZrF₆ nanocrystals

Thermal Enhancement of Upconversion in Sub‐10 nm Yb³⁺/Er³⁺/Na⁺ Tridoped Cs₂ZrF₆ Nanocrystals for Ratiometric Temperature Sensing

Thermal Enhancement of Upconversion in Sub‐10 nm Yb³⁺/Er³⁺/Na⁺ Tridoped Cs₂ZrF₆ Nanocrystals for Ratiometric Temperature Sensing