Atomic deciphering of cation exchange mechanism in upconversion nanoparticles

Описание

Тип публикации: статья из журнала

Год издания: 2020

Идентификатор DOI: 10.1016/j.jlumin.2020.117289

Ключевые слова: Cation exchange, Mn2+, Rietveld refinement, β-NaYF4 nanoparticles

Аннотация: Transition metal ion doping in upconversion nanoparticles (UCNPs) provides an effective way to enhance the luminescence for their wide array of applications. However, the doping sites of transition metal ions have not been comprehensively explored, and commonly assumed that transition metal ions replace the trivalent lanthanides wiПоказать полностьюthin the lattice. Here we report that cation exchange of transition metal (Mn2+) in β-NaYF4:Yb3+/Er3+ UCNPs occurs through alkaline metal (Na+) replacement, via 2Na+ ↔ Mn2+ + Vacancy reaction. This process distorts the LnF9 polyhedrons and tailors the surrounding environment around the trivalent lanthanides, thereby improving the upconversion intensity from active lanthanides. Further confirmed by core-shell design and spectroscopic study, we prove that the transition–alkaline metal exchange enables both the emission enhancement and transition probability variation of activators. © 2020

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Издание

Журнал: Journal of Luminescence

Выпуск журнала: Vol. 224

Номера страниц: 117289

ISSN журнала: 00222313

Издатель: Elsevier B.V.

Персоны

  • Guan Ming (Southern Univ Sci & Technol, UTS SUStech Joint Res Ctr Biomed Mat & Devices, Shenzhen 518055, Guangdong, Peoples R China)
  • Molokeev Maxim S. (RAS, SB, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia; Siberian Fed Univ, 79 Svobodny Ave, Krasnoyarsk 660041, Russia)
  • Zhou Jiajia (Southern Univ Sci & Technol, UTS SUStech Joint Res Ctr Biomed Mat & Devices, Shenzhen 518055, Guangdong, Peoples R China)

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