Tuning upconversion emission by controlling particle shape in NaYF4:Yb3+/Er3+ nanocrystals

Gao, Dangli; Zhang, Xiangyu; Gao, Wei

doi:10.1063/1.3681293

Cited by 44 publications

(28 citation statements)

References 28 publications

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“…6 that the red emission intensity is very low, and green emission stands highly prominent. In general, phosphors codoped with Er 3 and Yb 3 show good red emission intensity along with green emission [39,40]. Reduced red emission is a rare case and not observed usually from Er 3 ∕Yb 3 -doped samples.…”

Section: Spectrum Comparison With Other Er 3 ∕Y B 3 -Doped Phosphor Mmentioning

confidence: 93%

YVO_4:Er^3+/Yb^3+ phosphor for multifunctional applications

et al. 2014

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This article reports luminescence studies on wet-chemical route prepared YVO 4 :Er 3 ∕Yb 3 microdisc phosphor. The 980 nm laser excited upconversion (UC) emission intensity ratio of green to red bands is found too high to neglect the contribution from the red emission band, which is not observed normally in Er 3 ∕Yb 3 -doped materials. The red emission is also found absent in the downconversion emission under excitation at 316 nm. The variation of UC intensities with external temperature exhibits a well-fashioned pattern, which suggests that the 2 H 11∕2 and 4 S 3∕2 levels of Er 3 ion are thermally coupled. The YVO 4 :Er 3 ∕Yb 3 phosphor has shown outstanding temperature-sensing behavior with maximum sensitivity of 0.0117 K −1 at 400 K. This material is also employed to develop a latent fingerprint in green color. Furthermore, the present phosphor could be useful for solar cell concentrators, drug delivery, and disease therapy applications.

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Section: Spectrum Comparison With Other Er 3 ∕Y B 3 -Doped Phosphor Mmentioning

confidence: 93%

YVO_4:Er^3+/Yb^3+ phosphor for multifunctional applications

et al. 2014

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“…3(f) Fig. 4(a-b) and briefly described as follows [35][36][37][38][39]: first, the electron of Yb 3+ is excited from levels 2 F 7/2 to 2 F 5/2 under the 980 nm excitation. Then, the energy of the excited electron is transferred to Er 3+ , In the LiYF 4 and LiLuF 4 MC synthesis process, the EDTA is employed as a chelator to control particle size and morphology.…”

Section: Uc Emission Of Yb 3+ /Ln 3+ Co-doped Single Liyf 4 and Lilufmentioning

confidence: 99%

Multicolor upconversion emission of lanthanide-doped single LiYF4 and LiLuF4 microcrystal

Gao

Dong

Wang

et al. 2017

Materials Research Bulletin

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Yb 3+ /Ln 3+ co-doped LiYF 4 and LiLuF 4 microcrystals (MCs) are synthesized by a facile hydrothermal method. The upconversion (UC) luminescence properties of single LiYF 4 and LiLuF 4 :Yb 3+ /Ln 3+ MC are studied by a confocal microscopy setup under NIR 980 nm laser excitation. The single LiLuF 4 MC displays stronger UC emission intensity than that of single LiYF 4 MC, which is due to the varied site symmetry of the crystal field. The possible UC mechanism, the influence of surface properties and excitation positions on the UC luminescence emission are also investigated. Investigating the luminescence properties of a single particle can effectively avoid environmental influence, achieve selective targeting excitation, and provide precise information for studying the luminescence mechanism of Ln 3+ ions.

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“…51,52 In order to verify the influence of the local environment symmetry on luminescence intensity, photoluminescence spectroscopy of a series of Eu 3+ doped LaF 3 prepared at different pH values was carried out (Fig. 6).…”

Section: The Photoluminescence Properties Of Doped Fullerene-like Lafmentioning

confidence: 99%

Rare-earth doped LaF₃ hollow hexagonal nanoplates: hydrothermal synthesis and photoluminescence properties

et al. 2014

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A facile hydrothermal route at designated pH values has been developed to synthesize a series of welldispersed LaF 3 colloidal nanocrystals (NCs) with a rich variety of morphologies, including nanoparticles, hexagonal nanoplates and fullerene-like nanoparticles. X-ray diffraction, scanning electron microscopy, transmission electron microscopy, high-resolution transmission electron microscopy, Fourier transform infrared spectroscopy, and photoluminescence spectroscopy were used to characterize the samples. It is found that the formation of monodispersed fluoride NCs not only closely correlates with the pH values of the mother solutions, but also depends on the basicity of the base employed to adjust the pH value. The strong alkaline solution in the absence of any organic additive in this system was found to be a prerequisite for producing hexagonal fullerene-like LaF 3 nanodisks. A mechanism for the formation of the fullerene-like LaF 3 via the local Ostwald ripening process has been proposed based on observations of time-dependent experiments. The multicolor upconversion (UC) emission was successfully realized in a series of Yb 3+ /Er 3+ doped LaF 3 NCs by excitation in the near-infrared region. The UC emission ratios of red to green for a series of LaF 3 NCs can be tuned by adjusting the pH values of the mother liquids, and an UC mechanism activated by high-energy phonons inherent in the hollow LaF 3 nanoplates is proposed. It is expected that these rare-earth fluoride NCs might have potential applications in photocatalysis, biolabelling and drug-delivery.

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Tuning upconversion emission by controlling particle shape in NaYF4:Yb3+/Er3+ nanocrystals

Cited by 44 publications

References 28 publications

YVO_4:Er^3+/Yb^3+ phosphor for multifunctional applications

YVO_4:Er^3+/Yb^3+ phosphor for multifunctional applications

Multicolor upconversion emission of lanthanide-doped single LiYF4 and LiLuF4 microcrystal

Rare-earth doped LaF₃ hollow hexagonal nanoplates: hydrothermal synthesis and photoluminescence properties

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Tuning upconversion emission by controlling particle shape in NaYF4:Yb3+/Er3+ nanocrystals

Cited by 44 publications

References 28 publications

YVO_4:Er^3+/Yb^3+ phosphor for multifunctional applications

YVO_4:Er^3+/Yb^3+ phosphor for multifunctional applications

Multicolor upconversion emission of lanthanide-doped single LiYF4 and LiLuF4 microcrystal

Rare-earth doped LaF3 hollow hexagonal nanoplates: hydrothermal synthesis and photoluminescence properties

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Rare-earth doped LaF₃ hollow hexagonal nanoplates: hydrothermal synthesis and photoluminescence properties