Sensitized upconversion emissions of Tb 3+ by Tm 3+ in YF 3 and NaYF 4 nanocrystals

Lili Wang; Daisheng Zhang; Dan Zhao; Guanshi Qin; Weiping Qin

doi:10.1166/jnn.2011.5250

Sensitized upconversion emissions of Tb ³⁺ by Tm ³⁺ in YF ₃ and NaYF ₄ nanocrystals

Lili Wang, Daisheng Zhang, Dan Zhao, Guanshi Qin, Weiping Qin

Research output: Contribution to journal › Article › peer-review

31 Scopus citations

Abstract

Yb ³⁺-Tm ³⁺-Tb ³⁺-codoped YF ₃ and NaYF ₄ nanocrystals (NCs) were synthesized using a simple hydrothermal method. Under 980 nm excitation, violet and ultraviolet upconversion (UC) emissions of ⁵D ₃ → ⁷F _J (J = 6, 5, 4) and ⁵D ₄ → ⁷F _J (J = 6, 5, 4, 3) of Tb ³⁺ ions were observed with the fluoride NCs. In the Yb-Tm-Tb codoped NCs, energy transfer (ET) processes from Tm ³⁺ to Tb ³⁺ were proposed to be the main mechanisms for the UC emissions of Tb ³⁺ions. They are more efficient than the phonon assisted cooperative sensitization of the Yb ³⁺ couple proposed previously for similar material system. The analysis of power dependence indicated that populating the ⁵D ₄ level of the Tb ³⁺ ions was a four photon UC process, which demonstrated the existence of the two step ET process of Yb ³⁺ →Tm ³⁺ →Tb ³⁺. It was also found that UC luminescence properties of Tb ³⁺ ions were sensitive to crystal structures.

Original language	English
Pages (from-to)	9580-9583
Number of pages	4
Journal	Journal of Nanoscience and Nanotechnology
Volume	11
Issue number	11
DOIs	https://doi.org/10.1166/jnn.2011.5250
State	Published - 2011
Externally published	Yes

Keywords

ET
Nanocrystals
Tb
UC Luminescence
YF3

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10.1166/jnn.2011.5250

Cite this

@article{f032399749c74848afb2288cafaa176f,

title = "Sensitized upconversion emissions of Tb 3+ by Tm 3+ in YF 3 and NaYF 4 nanocrystals",

abstract = "Yb 3+-Tm 3+-Tb 3+-codoped YF 3 and NaYF 4 nanocrystals (NCs) were synthesized using a simple hydrothermal method. Under 980 nm excitation, violet and ultraviolet upconversion (UC) emissions of 5D 3 → 7F J (J = 6, 5, 4) and 5D 4 → 7F J (J = 6, 5, 4, 3) of Tb 3+ ions were observed with the fluoride NCs. In the Yb-Tm-Tb codoped NCs, energy transfer (ET) processes from Tm 3+ to Tb 3+ were proposed to be the main mechanisms for the UC emissions of Tb 3+ions. They are more efficient than the phonon assisted cooperative sensitization of the Yb 3+ couple proposed previously for similar material system. The analysis of power dependence indicated that populating the 5D 4 level of the Tb 3+ ions was a four photon UC process, which demonstrated the existence of the two step ET process of Yb 3+ →Tm 3+ →Tb 3+. It was also found that UC luminescence properties of Tb 3+ ions were sensitive to crystal structures.",

keywords = "ET, Nanocrystals, Tb, UC Luminescence, YF3",

author = "Lili Wang and Daisheng Zhang and Dan Zhao and Guanshi Qin and Weiping Qin",

year = "2011",

doi = "10.1166/jnn.2011.5250",

language = "English",

volume = "11",

pages = "9580--9583",

journal = "Journal of Nanoscience and Nanotechnology",

issn = "1533-4880",

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TY - JOUR

T1 - Sensitized upconversion emissions of Tb 3+ by Tm 3+ in YF 3 and NaYF 4 nanocrystals

AU - Wang, Lili

AU - Zhang, Daisheng

AU - Zhao, Dan

AU - Qin, Guanshi

AU - Qin, Weiping

PY - 2011

Y1 - 2011

N2 - Yb 3+-Tm 3+-Tb 3+-codoped YF 3 and NaYF 4 nanocrystals (NCs) were synthesized using a simple hydrothermal method. Under 980 nm excitation, violet and ultraviolet upconversion (UC) emissions of 5D 3 → 7F J (J = 6, 5, 4) and 5D 4 → 7F J (J = 6, 5, 4, 3) of Tb 3+ ions were observed with the fluoride NCs. In the Yb-Tm-Tb codoped NCs, energy transfer (ET) processes from Tm 3+ to Tb 3+ were proposed to be the main mechanisms for the UC emissions of Tb 3+ions. They are more efficient than the phonon assisted cooperative sensitization of the Yb 3+ couple proposed previously for similar material system. The analysis of power dependence indicated that populating the 5D 4 level of the Tb 3+ ions was a four photon UC process, which demonstrated the existence of the two step ET process of Yb 3+ →Tm 3+ →Tb 3+. It was also found that UC luminescence properties of Tb 3+ ions were sensitive to crystal structures.

AB - Yb 3+-Tm 3+-Tb 3+-codoped YF 3 and NaYF 4 nanocrystals (NCs) were synthesized using a simple hydrothermal method. Under 980 nm excitation, violet and ultraviolet upconversion (UC) emissions of 5D 3 → 7F J (J = 6, 5, 4) and 5D 4 → 7F J (J = 6, 5, 4, 3) of Tb 3+ ions were observed with the fluoride NCs. In the Yb-Tm-Tb codoped NCs, energy transfer (ET) processes from Tm 3+ to Tb 3+ were proposed to be the main mechanisms for the UC emissions of Tb 3+ions. They are more efficient than the phonon assisted cooperative sensitization of the Yb 3+ couple proposed previously for similar material system. The analysis of power dependence indicated that populating the 5D 4 level of the Tb 3+ ions was a four photon UC process, which demonstrated the existence of the two step ET process of Yb 3+ →Tm 3+ →Tb 3+. It was also found that UC luminescence properties of Tb 3+ ions were sensitive to crystal structures.

KW - ET

KW - Nanocrystals

KW - Tb

KW - UC Luminescence

KW - YF3

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DO - 10.1166/jnn.2011.5250

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