Multiphoton-Excited Upconversion Luminescence and Amplified Spontaneous Emission from Te4+-Doped Cs2SnCl6 Nanocrystals DOI
Wei Zhang, Wei Zheng, Lingyun Li

et al.

ACS Nano, Journal Year: 2025, Volume and Issue: unknown

Published: May 6, 2025

High-order nonlinear multiphoton absorption (MPA) is technologically important for a variety of photonic and biological applications owing to its superior advantages over linear low-order MPA such as greater spatial confinement, larger penetration depth, reduced autofluorescence, enhanced imaging resolution. However, practical implementation beyond three-photon processes remains notoriously difficult due the sharp reduction cross sections with increasing nonlinearity inherent material instability under high-density irradiation. Herein, we address these challenges through rationally designed Te4+-doped Cs2SnCl6 nanocrystals (NCs), which demonstrate wideband responsiveness across 800-2600 nm, allowing achievement two- seven-photon (PA) outperforming conventional optical materials. Particularly, engineered NCs enable 3PA-excited amplified spontaneous emission (ASE) an ultralow excitation threshold 0.22 μJ cm-2 1300 nm femtosecond-pulsed laser excitation, representing 1-4 orders magnitude improvement compared existing ASE systems. This work presents excellent 7PA properties in metal halide NCs, positioning lead-free promising efficient light-emitting materials extreme nanophotonics.

Language: Английский

An Acylhydrazone Fluorescent Sensor: Bifunctional Detection of Thorium (IV) and Vanadyl Ions over Uranyl and Lanthanide Ions DOI Open Access
Lin Xin, Hua Liang,

Ke Dai

et al.

International Journal of Molecular Sciences, Journal Year: 2025, Volume and Issue: 26(7), P. 3231 - 3231

Published: March 31, 2025

Thorium is a notable candidate for resolving uranium shortage caused by the global application of nuclear power generation. Uranium extraction from seawater another attempt to handle its source deficiency, however, vanadium one main competitive elements in that process. Exploration probes which can discriminatively detect thorium and has primary significance their further separation environmental protection. Herein, N′-(2,4-dihydroxybenzylidene)-4-hydroxylphenylhydrazide, AOH, used as sensor Th4+ vanadyl (VO2+) determination. AOH demonstrates specific “turn-on” fluorescence selectivity towards over f-block other foreign metal ions, with detection limit (LOD) 7.19 nM acidic solution binding constant 9.97 × 109 M−2. Meanwhile, it shows “turn-off” response VO2+ ions at coexistence Th4+, LOD 0.386 μM same media 4.54 104 M−1. The recognition mechanism, based on HRMS, 1H NMR, FT-IR results, causes quenching replacing coordinate AOH. In real water tests, exhibited satisfying recoveries. These findings expand sensors nuclide pollution control.

Language: Английский

Citations

0
Multiphoton-Excited Upconversion Luminescence and Amplified Spontaneous Emission from Te4+-Doped Cs2SnCl6 Nanocrystals DOI
Wei Zhang, Wei Zheng, Lingyun Li

et al.

ACS Nano, Journal Year: 2025, Volume and Issue: unknown

Published: May 6, 2025

High-order nonlinear multiphoton absorption (MPA) is technologically important for a variety of photonic and biological applications owing to its superior advantages over linear low-order MPA such as greater spatial confinement, larger penetration depth, reduced autofluorescence, enhanced imaging resolution. However, practical implementation beyond three-photon processes remains notoriously difficult due the sharp reduction cross sections with increasing nonlinearity inherent material instability under high-density irradiation. Herein, we address these challenges through rationally designed Te4+-doped Cs2SnCl6 nanocrystals (NCs), which demonstrate wideband responsiveness across 800-2600 nm, allowing achievement two- seven-photon (PA) outperforming conventional optical materials. Particularly, engineered NCs enable 3PA-excited amplified spontaneous emission (ASE) an ultralow excitation threshold 0.22 μJ cm-2 1300 nm femtosecond-pulsed laser excitation, representing 1-4 orders magnitude improvement compared existing ASE systems. This work presents excellent 7PA properties in metal halide NCs, positioning lead-free promising efficient light-emitting materials extreme nanophotonics.

Language: Английский

Citations

0