Environmental Impact on the Excitation Path of the Red Upconversion Emission of Nanocrystalline NaYF4: Yb3+,Er3+

Iko Hyppänen; Niina Höysniemi; Riikka Arppe; Michael Schäferling; Tero Soukka

doi:10.1021/acs.jpcc.7b01019

Environmental Impact on the Excitation Path of the Red Upconversion Emission of Nanocrystalline NaYF₄: Yb³⁺,Er³⁺

Iko Hyppänen^*, Niina Höysniemi, Riikka Arppe, Michael Schäferling, Tero Soukka

^*Corresponding author for this work

Department of Chemistry

22 Citations (Scopus)

Abstract

The mechanism for red upconversion luminescence of Yb-Er codoped materials is not generally agreed on in the literature. Both two-photon and three-photon processes have been suggested as the main path for red upconversion emission. We have studied β-NaYF₄:Yb³⁺,Er³⁺ nanoparticles in H₂O and D₂O, and we propose that the nanoparticle environment is a major factor in the selection of the preferred red upconversion excitation pathway. In H₂O, efficient multiphonon relaxation (MPR) promotes the two-photon mechanism through green emitting states, while, in D₂O, MPR is less effective and the three-photon path involving back energy transfer to Yb³⁺ is the dominant mechanism. For the green upconversion emission, our results suggest the common two-photon path through the ⁴F_9/2 energy state in both H₂O and D₂O. (Figure Presented).

Original language	English
Journal	Journal of Physical Chemistry C
Volume	121
Issue number	12
Pages (from-to)	6924-6929
Number of pages	6
ISSN	1932-7447
DOIs	https://doi.org/10.1021/acs.jpcc.7b01019
Publication status	Published - 2017

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title = "Environmental Impact on the Excitation Path of the Red Upconversion Emission of Nanocrystalline NaYF4: Yb3+,Er3+",

abstract = "The mechanism for red upconversion luminescence of Yb-Er codoped materials is not generally agreed on in the literature. Both two-photon and three-photon processes have been suggested as the main path for red upconversion emission. We have studied β-NaYF4:Yb3+,Er3+ nanoparticles in H2O and D2O, and we propose that the nanoparticle environment is a major factor in the selection of the preferred red upconversion excitation pathway. In H2O, efficient multiphonon relaxation (MPR) promotes the two-photon mechanism through green emitting states, while, in D2O, MPR is less effective and the three-photon path involving back energy transfer to Yb3+ is the dominant mechanism. For the green upconversion emission, our results suggest the common two-photon path through the 4F9/2 energy state in both H2O and D2O. (Figure Presented).",

author = "Iko Hypp{\"a}nen and Niina H{\"o}ysniemi and Riikka Arppe and Michael Sch{\"a}ferling and Tero Soukka",

year = "2017",

doi = "10.1021/acs.jpcc.7b01019",

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journal = "The Journal of Physical Chemistry Part C",

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TY - JOUR

T1 - Environmental Impact on the Excitation Path of the Red Upconversion Emission of Nanocrystalline NaYF4

T2 - Yb3+,Er3+

AU - Hyppänen, Iko

AU - Höysniemi, Niina

AU - Arppe, Riikka

AU - Schäferling, Michael

AU - Soukka, Tero

PY - 2017

Y1 - 2017

N2 - The mechanism for red upconversion luminescence of Yb-Er codoped materials is not generally agreed on in the literature. Both two-photon and three-photon processes have been suggested as the main path for red upconversion emission. We have studied β-NaYF4:Yb3+,Er3+ nanoparticles in H2O and D2O, and we propose that the nanoparticle environment is a major factor in the selection of the preferred red upconversion excitation pathway. In H2O, efficient multiphonon relaxation (MPR) promotes the two-photon mechanism through green emitting states, while, in D2O, MPR is less effective and the three-photon path involving back energy transfer to Yb3+ is the dominant mechanism. For the green upconversion emission, our results suggest the common two-photon path through the 4F9/2 energy state in both H2O and D2O. (Figure Presented).

AB - The mechanism for red upconversion luminescence of Yb-Er codoped materials is not generally agreed on in the literature. Both two-photon and three-photon processes have been suggested as the main path for red upconversion emission. We have studied β-NaYF4:Yb3+,Er3+ nanoparticles in H2O and D2O, and we propose that the nanoparticle environment is a major factor in the selection of the preferred red upconversion excitation pathway. In H2O, efficient multiphonon relaxation (MPR) promotes the two-photon mechanism through green emitting states, while, in D2O, MPR is less effective and the three-photon path involving back energy transfer to Yb3+ is the dominant mechanism. For the green upconversion emission, our results suggest the common two-photon path through the 4F9/2 energy state in both H2O and D2O. (Figure Presented).

U2 - 10.1021/acs.jpcc.7b01019

DO - 10.1021/acs.jpcc.7b01019

M3 - Journal article

AN - SCOPUS:85019880232

SN - 1932-7447

VL - 121

SP - 6924

EP - 6929

JO - The Journal of Physical Chemistry Part C

JF - The Journal of Physical Chemistry Part C

IS - 12

ER -

Environmental Impact on the Excitation Path of the Red Upconversion Emission of Nanocrystalline NaYF4: Yb3+,Er3+

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Environmental Impact on the Excitation Path of the Red Upconversion Emission of Nanocrystalline NaYF₄: Yb³⁺,Er³⁺