Effect of Li+ ions on the enhancement upconversion and stokes emission of NaYF4:Tb, Yb co-doped in glass-ceramics

Gao, Yuan; Hu, Yuebo; Ren, Peng; Zhou, Dacheng; Qiu, Jianbei

doi:10.1016/j.jallcom.2016.01.200

Cited by 37 publications

(15 citation statements)

References 18 publications

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“…However, metal nanoparticles (MNPs) have been considered to enhance UCNPs efficiency. Different strategies including chemical modification, crystal structure, and local field adjustment of metal have been proposed to improve the efficiency and sensitivity [13]. Investigations on rare earth ion-doped luminescence materials for luminescence enhancement of metal nanostructure such as Er 3+ /Yb 3+ co-doped bismuth-germinate glasses containing Ag nanoparticles and Er 3+ /Yb 3+ co-doped β-NaLuF 4 nanocrystals which are spin-coated over gold NPs have been reported with inconsistent results and high sensitivity [14].…”

Section: Introductionmentioning

confidence: 99%

Polymer Microfibers Incorporated with Silver Nanoparticles: a New Platform for Optical Sensing

et al. 2019

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The enhanced sensitivity of up-conversion luminescence is imperative for the application of up-conversion nanoparticles (UCNPs). In this study, microfibers were fabricated after co-doping UCNPs with polymethylmethacrylate (PMMA) and silver (Ag) solutions. Transmission losses and sensitivities of UCNPs (tetrogonal-LiYF 4 :Yb 3+ /Er 3+ ) in the presence and absence of Ag were investigated. Sensitivity of up-conversion luminescence with Ag (LiYF 4 :Yb 3+ /Er 3+ /Ag) is 0.0095 K −1 and reduced to (LiYF 4 :Yb 3+ /Er 3+ ) 0.0065 K −1 without Ag at 303 K under laser source (980 nm). The UCNP microfibers with Ag showed lower transmission losses and higher sensitivity than without Ag and could serve as promising candidate for optical applications. This is the first observation of Ag-doped microfiber via facile method.

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Section: Introductionmentioning

confidence: 99%

Polymer Microfibers Incorporated with Silver Nanoparticles: a New Platform for Optical Sensing

et al. 2019

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“…According to our test results, the cooperative energy transfer occurs between two Yb 3+ ions and one Tb 3+ ion in the up-conversion process. Initially, the ground 2 F 7/2 states of two Yb 3+ ions are promoted to excited 2 F 5/2 states by absorbing the laser emission, and meanwhile, the first photon excites one Tb 3+ ion from the ground 7 ions in the excited 5 D 1 state relax nonradiatively to the 5 D 3 state, which radiatively decays to 7 F J (J=6-0), resulting short-wavelength emissions [31][32][33]. However, in the Yb 3+ and Tb 3+ co-doped LaNbO 4 sample, short-wavelength emissions are not observed (in Fig.…”

Section: Figmentioning

confidence: 99%

“…It follows that Yb 3+ is a great sensitizer to enhance the pump efficiency in up-conversion luminescence. In recent years, after the study of activators such as Er 3+ , Ho 3+ , and Tm 3+ , the up-conversion luminescence of Yb 3+ -Tb 3+ co-doped in various samples has gained increasing attention due to the high energy-transfer efficiency from Yb 3+ to Tb 3+ and green luminescence (~543 nm) from 5 D 4 → 7 F 5 transition in Tb [25][26][27][28]. However, for the Yb 3+ /Tb 3+ dopants, the mechanism of up-conversion is cooperative energy transfer (CET) which differs from remaining.…”

Section: Introductionmentioning

confidence: 99%

Luminescence, energy transfer, and up-conversion mechanisms of Yb3+ and Tb3+ co-doped LaNbO4

Huang

Wang

Zhou

et al. 2017

Journal of Alloys and Compounds

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Novel green-emitting Yb 3+ and Tb 3+ co-doped LaNbO 4 particles were prepared through a facile sol-gel and combustion method. X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), thermogravimetric and differential thermal analysis (TG-DTA), up-conversion luminescence (UCL) with different powers and varied concentrations, and luminescent lifetimes were employed to test the prepared samples. The XRD data exhibit that a sample with high crystallinity can be acquired at 1000 °C. FE-SEM images show homogeneous and spherical grains after Yb 3+ and Tb 3+ are co-doped in the LaNbO 4 samples. TG-DTA reveals that the LaNbO 4 synthetic process is accompanied by a temperature increase. In our work, we utilize a 980 nm laser to excite Yb 3+ ions to achieve the 2 F 7/2 → 2 F 5/2 transition, and the LaNbO 4 :Yb 3+ , Tb 3+ sample exhibits intense green emission. Luminescent spectra at different powers demonstrated the two-photon absorption process; meanwhile, the corresponding energy transfer mechanism from Yb 3+ to Tb 3+ and the emission of Tb 3+ under 980 nm laser excitation was described via an energy level diagram. Moreover, concentration-dependent up-conversion luminescent properties were systematically explored, and it was confirmed that LaNbO 4 :0.15Yb 3+ ,0.02Tb 3+ exhibits the strongest luminescent properties. In particular, as the content of Yb 3+ ions increases, the 5 D 4 → 7 F 6 transition quickly becomes stronger, resulting in the emitted color shifting from green to blue. Therefore, the emitted color can be tuned by adjusting the content of Yb 3+ ions. The excellent up-conversion emission properties of the obtained samples allow for their potential application in the fields of 3D display technologies and 3 solid-state lasers.

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“…Up to now, many strategies have been proposed for improving the efficiency, which include the chemical modification, crystal structure and local field adjustment, introduction of codopant sensitizers and hybrid configuration, etc [10][11][12][13][14][15]. With development of plasmonic and surface enhanced spectroscopy, noble metal nanoparticles(NPs) has been considered as a new way to enhance the UC luminescence efficiency [16][17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Influence of SiO2 layer on the plasmon quenched upconversion luminescence emission of core-shell NaYF4:Yb,Er@SiO2@Ag nanocomposites

Wang

Gao

Wang

et al. 2016

Materials Research Bulletin

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β-NaYF 4 :Yb,Er@SiO 2 @Ag core-shell hybrid nanostructures are prepared and single core-shell hybrid particle is taken to investigate the influence of separation layer on the metal enhanced upconversion luminescence and corresponding mechanism. It is found that the green ( 4 S 3/2 → 4 I 15/2 ) and red ( 4 F 9/2 → 4 I 15/2 ) emissions of Er 3+ increase first and then decrease with the increase of silica shell thickness. The best enhancement is observed at the silica thickness of 12 nm. Time-resolved spectra study shows that the emission enhancement dominates when the silica thickness is 12 nm, which leads to an enhancement factor of 1.28. But the enhancement factor reduces to 0.52 when the silica shell thickness is 5 nm. Here, we define enhancement factor g(ω F ) as 0 F / ) ( I I g F   , I F and I 0 are fluorescence intensities of UCNPs with emission enhancement and without plasmon enhancement. The luminescence enhancement is owing to the enhanced emission process rather than the excitation process.

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Effect of Li+ ions on the enhancement upconversion and stokes emission of NaYF4:Tb, Yb co-doped in glass-ceramics

Cited by 37 publications

References 18 publications

Polymer Microfibers Incorporated with Silver Nanoparticles: a New Platform for Optical Sensing

Polymer Microfibers Incorporated with Silver Nanoparticles: a New Platform for Optical Sensing

Luminescence, energy transfer, and up-conversion mechanisms of Yb3+ and Tb3+ co-doped LaNbO4

Influence of SiO2 layer on the plasmon quenched upconversion luminescence emission of core-shell NaYF4:Yb,Er@SiO2@Ag nanocomposites

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