Near-infrared Upconversion Luminescences Properties of Yb3+-Tm3+ Co-doped BiOBr Nanocrystals

doi:10.15541/jim20150389

Abstract

Abstract:

Yb³⁺-Tm³⁺ co-doped BiOBr nanocrystals were successfully prepared by hydrothermal method, and its upconversion luminescence properties was investigated. Under excitation at 980 nm light, an intense near-infrared (801 nm) accompanied by weak red (655 nm) and blue emissions (485 nm) were observed, which were attributed to the ³H₄→³H₆, ¹G₄→³F₄ and ¹G₄→³H₆transitions of Tm³⁺ions, respectively. Power dependence studies revealed that blue and red emission resulted from a three-photon process, while the near-infrared emission resulted from a two-photon process, and a possible upconversion mechanism is discussed. As the Yb³⁺ ions concentration increasing, the overall emission intensity increases and near infrared emission is much stronger than red and blue ones. Consequently, the ratios of near-infrared to visible (I_{801 nm}/I_{485 nm}) reaches 71.4. These results indicate that the Yb³⁺-Tm³⁺ co-doped BiOBr nanocrystals have potential applications in biological field as luminescence labeling probers.

Key words: BiOBr: Yb³⁺, Tm³⁺, upconversion luminescence, near infrared emission

CLC Number:

TQ174

LI Yong-Jin, LIU Qun, ZHOU Yu-Ting, QIU Jian-Bei, SONG Zhi-Guo. Near-infrared Upconversion Luminescences Properties of Yb³⁺-Tm³⁺ Co-doped BiOBr Nanocrystals[J]. Journal of Inorganic Materials, 2016, 31(3): 279-284.

Figures/Tables 8

Fig. 1 XRD patterns of Yb3+-Tm3+ co-doped BiOBr nanocrystals with different Yb3+ concentrations

Table1 Lattice constants and cell volume of Yb3+-Tm3+ co-doped BiOBr nanocrystals with different Yb3+ concentrations

Yb³⁺/ mol%	Lattice constant/nm		Cell volume /nm³
Yb³⁺/ mol%	a=b	c	Cell volume /nm³
1	0.3936	0.8141	0.12615
3	0.3931	0.8112	0.12535
5	0.3930	0.8111	0.12530
7	0.3926	0.8121	0.12519
10	0.3915	0.8095	0.12407

Fig. 2 TEM images of Yb3+-Tm3+ co-doped BiOBr nanocrystals

Fig. 3 FT-IR spectrum of BiOBr: Yb3+, Tm3+ nanocrystals

Fig. 4 Upconversion emission spectrum of BiOBr: Yb3+, Tm3+ (1.0/0.5mol% ) nanocrystals under excitation at 980 nm

Fig. 5 (a) Power dependence of the UC emission intensities of BiOBr: Yb3+, Tm3+ (1.0/0.5mol% ); (b) Energy level diagrams of BiOBr nanocrystals and possible UC mechanisms under 980 nm excitation.

Fig. 6 (a) Upconversion emission spectra of BiOBr: Yb3+, Tm3+ nanocrystals with different Yb3+ concentration under excitation at 980 nm and (b) the intensity of 485, 655 and 801 nm wavelength vs Yb3+ ions concentration

Table 2 Intensity ratio of near-infrared to blue (I801 nm/ I485 nm) variation in Yb3+ doping concentration

Yb³⁺/mol%	1.0	3.0	5.0	7.0	10.0
I_{801 nm}/I_{485 nm}	34.8	38.1	62.0	71.4	70.3

References 24

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Near-infrared Upconversion Luminescences Properties of Yb³⁺-Tm³⁺ Co-doped BiOBr Nanocrystals

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