Enhanced ultraviolet upconversion in YF3:Yb3+/Tm3+ nanocrystals

Guofeng WANG; Weiping QIN; Lili WANG; Guodong WEI; Peifen ZHU; Daisheng ZHANG; Fuheng DING

doi:10.1016/S1002-0721(08)60245-8

Enhanced ultraviolet upconversion in YF₃:Yb³⁺/Tm³⁺ nanocrystals

Guofeng WANG, Weiping QIN, Lili WANG, Guodong WEI, Peifen ZHU, Daisheng ZHANG, Fuheng DING

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

16 Scopus citations

Abstract

Unusual intense infrared-to-ultraviolet upconversion luminescence was observed in YF₃:Yb³⁺(20%)/Tm³⁺(1%) nanocrystals under 980 nm excitation. The intense ultraviolet emissions (¹I₆→³H₆, ¹I₆→³F₄, and ¹D₂→³H₆) were affirmed arising from the excitation processes of five-photon and four-photon. In comparison with the bulk sample with the same chemical compositions, ultraviolet upconversion luminescence of the nanocrystals was markedly enhanced. Spectral analysis indicated that the enhancement was attributed to the decrease of Judd-Ofelt parameter Ω₂, which precluded the transition rate from ³F₂ to ³F₄, enhanced the energy transfer process and populated the ¹D₂ level: ³F₂→³H₆ (Tm³⁺): ³H₄→¹D₂ (Tm³⁺).

Original language	English
Pages (from-to)	330-333
Number of pages	4
Journal	Journal of Rare Earths
Volume	27
Issue number	2
DOIs	https://doi.org/10.1016/S1002-0721(08)60245-8
State	Published - Apr 2009
Externally published	Yes

Keywords

Judd-Ofelt parameter
nanocrystals
rare earths
upconversion luminescence

Access to Document

10.1016/S1002-0721(08)60245-8

Cite this

@article{fa8d7032dae24e069477cd587795df19,

title = "Enhanced ultraviolet upconversion in YF3:Yb3+/Tm3+ nanocrystals",

abstract = "Unusual intense infrared-to-ultraviolet upconversion luminescence was observed in YF3:Yb3+(20%)/Tm3+(1%) nanocrystals under 980 nm excitation. The intense ultraviolet emissions (1I6→3H6, 1I6→3F4, and 1D2→3H6) were affirmed arising from the excitation processes of five-photon and four-photon. In comparison with the bulk sample with the same chemical compositions, ultraviolet upconversion luminescence of the nanocrystals was markedly enhanced. Spectral analysis indicated that the enhancement was attributed to the decrease of Judd-Ofelt parameter Ω2, which precluded the transition rate from 3F2 to 3F4, enhanced the energy transfer process and populated the 1D2 level: 3F2→3H6 (Tm3+): 3H4→1D2 (Tm3+).",

keywords = "Judd-Ofelt parameter, nanocrystals, rare earths, upconversion luminescence",

author = "Guofeng WANG and Weiping QIN and Lili WANG and Guodong WEI and Peifen ZHU and Daisheng ZHANG and Fuheng DING",

note = "Funding Information: Foundation item: Project supported by the National Natural Science Foundation of China (10474096 and 50672030)",

year = "2009",

month = apr,

doi = "10.1016/S1002-0721(08)60245-8",

language = "English",

volume = "27",

pages = "330--333",

journal = "Journal of Rare Earths",

issn = "1002-0721",

publisher = "Editorial Office of Chinese Rare Earths",

number = "2",

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TY - JOUR

T1 - Enhanced ultraviolet upconversion in YF3:Yb3+/Tm3+ nanocrystals

AU - WANG, Guofeng

AU - QIN, Weiping

AU - WANG, Lili

AU - WEI, Guodong

AU - ZHU, Peifen

AU - ZHANG, Daisheng

AU - DING, Fuheng

N1 - Funding Information: Foundation item: Project supported by the National Natural Science Foundation of China (10474096 and 50672030)

PY - 2009/4

Y1 - 2009/4

N2 - Unusual intense infrared-to-ultraviolet upconversion luminescence was observed in YF3:Yb3+(20%)/Tm3+(1%) nanocrystals under 980 nm excitation. The intense ultraviolet emissions (1I6→3H6, 1I6→3F4, and 1D2→3H6) were affirmed arising from the excitation processes of five-photon and four-photon. In comparison with the bulk sample with the same chemical compositions, ultraviolet upconversion luminescence of the nanocrystals was markedly enhanced. Spectral analysis indicated that the enhancement was attributed to the decrease of Judd-Ofelt parameter Ω2, which precluded the transition rate from 3F2 to 3F4, enhanced the energy transfer process and populated the 1D2 level: 3F2→3H6 (Tm3+): 3H4→1D2 (Tm3+).

AB - Unusual intense infrared-to-ultraviolet upconversion luminescence was observed in YF3:Yb3+(20%)/Tm3+(1%) nanocrystals under 980 nm excitation. The intense ultraviolet emissions (1I6→3H6, 1I6→3F4, and 1D2→3H6) were affirmed arising from the excitation processes of five-photon and four-photon. In comparison with the bulk sample with the same chemical compositions, ultraviolet upconversion luminescence of the nanocrystals was markedly enhanced. Spectral analysis indicated that the enhancement was attributed to the decrease of Judd-Ofelt parameter Ω2, which precluded the transition rate from 3F2 to 3F4, enhanced the energy transfer process and populated the 1D2 level: 3F2→3H6 (Tm3+): 3H4→1D2 (Tm3+).

KW - Judd-Ofelt parameter

KW - nanocrystals

KW - rare earths

KW - upconversion luminescence

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U2 - 10.1016/S1002-0721(08)60245-8

DO - 10.1016/S1002-0721(08)60245-8

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SN - 1002-0721

VL - 27

SP - 330

EP - 333

JO - Journal of Rare Earths

JF - Journal of Rare Earths

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