Solvothermal synthesis of monodisperse ultrasmall cubic-structure Ba2YbF7 nanocrystals with intense upconversion

Xu, Cheng; Ma, Minglong; Zeng, Songjun; Ren, Guanhua; Yang, Liwen; Yang, Qibin

doi:10.1016/j.jallcom.2011.05.045

Cited by 19 publications

(2 citation statements)

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“…There is a large collection of reported work on fluorides such as AREF 4 , MF 2 , REF 3 and xMF 2 -yREF 3 (A=alkali metal ions, M being a group-II element) [4][5][6][7][8][9][10][11][12][13][14]. MF 2 -REF 3 systems have been extensively investigated and used as good host matrix for many optically active ions, with application in laser crystals and as UC material [15].…”

Section: Introductionmentioning

confidence: 99%

Site selective spectroscopy in BaYF 5 :RE 3+ (RE = Eu, Sm) nano-glass–ceramics

del-Castillo

Yanes

Abé

et al. 2015

Journal of Alloys and Compounds

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Trivalent rare-earth (RE = Eu, Sm) doped transparent nano-glass-ceramics comprising BaYF5 nanocrystals were successfully obtained by appropriate heat-treatment of the corresponding precursor sol-gel glasses. Their structural and spectroscopic properties were investigated and compared with those for Eu3+-doped-BaYF5 nanocrystals prepared by a solvothermal method. X-ray Diffraction, Transmission Electron Microscopy and Energy Dispersive X-ray Spectroscopy measurements confirmed the distribution of BaYF5 nanocrystals in the glass matrix, presenting a cubic phase structure with space group Fm-3m. In order to achieve a further structural characterization, the luminescence properties of the Eu3+ and Sm3+ dopants were also used as sensitive probes. The reduction in the emission intensities of hypersensitive transitions 5D0->7F2 and 4G5/2->6H9/2 for Eu3+ and Sm3+ ions respectively, along with time-resolved measurements, confirm the distribution of a significant fraction of RE ions into the fluoride nanocrystal environment. These results suggest that BaYF5 nano-glass-ceramics doped with Eu3+ or Sm3+ can be considered as potential red-emitting phosphors for the development of white LEDs under near UV excitation. Dear Editor:Hereby we submit a manuscript entitled "Site selective spectroscopy in BaYF 5 :RE 3+ (RE = Eu, Sm) nano-glass-ceramics" by J. del-Castillo, A.C. Yanes, S. Abé and P. F. Smet for publication in Journal of Alloys and Compounds. The manuscript reports on transparent nano-glass-ceramics containing Ln 3+ -doped BaYF 5 nanocrystals embedded in amorphous silica matrix, successfully obtained by heat treatment of precursor sol-gel glasses, for the first time, focussing the attention on the structure properties of cubic BaYF 5 nanocrystal. Moreover, Eu 3+ doped-BaYF 5 NCs were successfully obtained by a solvothermal method in order to compare and confirm the cubic structure of fluoride NCs in the nGCs system. We believe this paper will be of interest for wide audience of your journal. On behalf of co-authors J. del-Castillo first time, the synthesis of sol-gel transparent glass-ceramics comprising Eu 3+ or Sm 3+ -doped cubic BaYF 5 nanocrystals. I am also reporting the preparation of Eu 3+ -doped BaYF 5 nanocrystals by solvothermal method, and the study of their luminescent properties to compare with the Eu 3+ -doped nGCs, Further, I have used Eu 3+ and Sm 3+ as probe ions in the glassceramics, to distinguish between amorphous and like-crystalline environments, confirming the incorporation of a large fraction of RE ions into the BaYF 5 nanocrystals.These results suggest that BaYF 5 glass-ceramics doped with Eu 3+ or Sm 3+ can be considered as potential red-emitting phosphors for the development of white LEDs under near UV excitation. In view to this, the publication of this work in Journal of Alloys and Compounds will be valuable. Sincerely yours, AbstractTrivalent rare-earth (RE = Eu, Sm) doped transparent nano-glass-ceramics comprising BaYF 5 nanocrystals were successfully obtained by appropriate heattreatment ...

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Section: Introductionmentioning

confidence: 99%

Site selective spectroscopy in BaYF 5 :RE 3+ (RE = Eu, Sm) nano-glass–ceramics

del-Castillo

Yanes

Abé

et al. 2015

Journal of Alloys and Compounds

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“…For a system codoped with Er 3þ and Yb 3þ ions, the large spectral overlap between Yb 3þ emission ( 2 F 5=2 -2 F 7=2 ) and Er 3þ absorption ( 4 I 15=2 -4 I 11=2 ) results in an efficient energy transfer process. 20,21) Red and green emissions from Er 3þ -doped and Er 3þ -Yb 3þ -codoped oxide nanocrystals have been widely reported, [22][23][24] and some studies showed strong emission from ZrO 2 . 25,26) However, only a few studies on the analysis of the ion concentration effect have been reported.…”

Section: Introductionmentioning

confidence: 99%

Effect of Yb³⁺ Concentrations on the Upconversion Luminescence Properties of ZrO₂:Er³⁺,Yb³⁺ Phosphors

Noh¹,

Yang²,

Moon³

et al. 2013

Jpn. J. Appl. Phys.

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ZrO2:Er3+ and ZrO2:Er3+,Yb3+ phosphors were synthesized via a solvothermal reaction method. For low concentrations of Yb3+, the crystalline structure changed from the tetragonal to monoclinic phase as sintering temperature increased. As the Yb3+ concentration increased to a value above 0.05 mol, ZrO2 phosphors displayed a very stable tetragonal phase. The green and red upconversion emissions of ZrO2:Er3+,Yb3+ phosphors were measured under the excitation with a 975 nm continuous wave diode laser, and the pump power dependence of upconversion intensity was investigated. As the Yb3+ concentration increased from 0 to 0.05 mol, the red upconversion emission intensity increased more rapidly than the green emission intensity. This is attributed to the energy transfer (4I11/2→4I15/2 4I13/2→4F9/2) between Er3+ ions and the energy back transfer [4S3/2 4I13/2(Er3+)→2F7/2 2F5/2(Yb3+)] between the Er3+ and Yb3+ ions. In this case, the pump power dependence of red emission intensity changed from quadratic to linear as Yb3+ concentration increased.

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Solvothermal synthesis and upconversion emission of monodisperse ultrasmall SrYbF5 nanocrystals

Gong

Yang

et al. 2013

J Mater Sci

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Solvothermal synthesis of monodisperse ultrasmall cubic-structure Ba2YbF7 nanocrystals with intense upconversion

Cited by 19 publications

References 31 publications

Site selective spectroscopy in BaYF 5 :RE 3+ (RE = Eu, Sm) nano-glass–ceramics

Site selective spectroscopy in BaYF 5 :RE 3+ (RE = Eu, Sm) nano-glass–ceramics

Effect of Yb³⁺ Concentrations on the Upconversion Luminescence Properties of ZrO₂:Er³⁺,Yb³⁺ Phosphors

Solvothermal synthesis and upconversion emission of monodisperse ultrasmall SrYbF5 nanocrystals

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Solvothermal synthesis of monodisperse ultrasmall cubic-structure Ba2YbF7 nanocrystals with intense upconversion

Cited by 19 publications

References 31 publications

Site selective spectroscopy in BaYF 5 :RE 3+ (RE = Eu, Sm) nano-glass–ceramics

Site selective spectroscopy in BaYF 5 :RE 3+ (RE = Eu, Sm) nano-glass–ceramics

Effect of Yb3+ Concentrations on the Upconversion Luminescence Properties of ZrO2:Er3+,Yb3+ Phosphors

Solvothermal synthesis and upconversion emission of monodisperse ultrasmall SrYbF5 nanocrystals

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Effect of Yb³⁺ Concentrations on the Upconversion Luminescence Properties of ZrO₂:Er³⁺,Yb³⁺ Phosphors