Direct Evidence for Coupled Surface and Concentration Quenching Dynamics in Lanthanide-Doped Nanocrystals
| Autor: | Hongjie Dai, Shuo Diao, Sha He, Noah J. J. Johnson, Emory M. Chan, Adah Almutairi |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Lanthanide
Luminescence Surface Properties Analytical chemistry chemistry.chemical_element 02 engineering and technology 010402 general chemistry Lanthanoid Series Elements 01 natural sciences Biochemistry Catalysis Ion Erbium Colloid and Surface Chemistry Particle Size Quenching (fluorescence) Dopant General Chemistry 021001 nanoscience & nanotechnology Photon upconversion 0104 chemical sciences chemistry Nanocrystal Nanoparticles Thermodynamics 0210 nano-technology |
| Zdroj: | Journal of the American Chemical Society. 139:3275-3282 |
| ISSN: | 1520-5126 0002-7863 |
| Popis: | Luminescence quenching at high dopant concentrations generally limits the dopant concentration to less than 1–5 mol% in lanthanide-doped materials, and this remains a major obstacle in designing materials with enhanced efficiency/brightness. In this work, we provide direct evidence that the major quenching process at high dopant concentrations is the energy migration to the surface (i.e., surface quenching) as opposed to the common misconception of cross-relaxation between dopant ions. We show that after an inert epitaxial shell growth, erbium (Er3+) concentrations as high as 100 mol% in NaY(Er)F4/NaLuF4 core/shell nanocrystals enhance the emission intensity of both upconversion and downshifted luminescence across different excitation wavelengths (980, 800, and 658 nm), with negligible concentration quenching effects. Our results highlight the strong coupling of concentration and surface quenching effects in colloidal lanthanide-doped nanocrystals, and that inert epitaxial shell growth can overcome concen... |
| Databáze: | OpenAIRE |
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