Effects of the reaction time and size on the up conversion luminescence of NaYF4:Yb(20%),Er(1%) microcrystals

Chen, Yongsheng; He, Wei; Wang, Honghong; Hao, Xiuli; Jiao, Yuechao; Lu, Jingxiao; Yang, Shi‐e

doi:10.1016/j.jlumin.2012.04.034

Cited by 27 publications

(11 citation statements)

References 17 publications

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“…This result was consistent with the previous report . However, there are some behaviors different from another previous report . For example, n = 1.33 for red emission was much lower than 1.8 in Ref.…”

Section: Resultssupporting

confidence: 92%

“…For example, n = 1.33 for red emission was much lower than 1.8 in Ref. , this difference might mainly be attributed to the difference of phonon energy in different matrix, the phonon energy of NaYF 4 was 360 cm −1 , whereas the phonon energy of oxides was 400~600 cm −1 , the non‐radiative transition of rare earth ions in fluorides was lower than in oxides. Reduced phonon energy of the matrix materials helps to improve the luminescence efficiency of rare earth ions.…”

Section: Resultsmentioning

confidence: 70%

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Synthesis and Up‐conversion Luminescence of Yb³⁺/Ln³⁺ (Ln = Er,Tm,Ho) Co‐Doped Strontium Cerate by Pechini Method

2014

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Novel up‐conversion (UC) luminescent nanopowders, Sr2CeO4:Yb3+,Ln3+ (Ln = Er, Tm, Ho) were prepared with Pechini method. The Sr2CeO4:Yb3+,Ln3+ (Ln = Er, Tm, Ho) nanopowders had an orthorhombic crystal structure, and showed olive‐like morphology with the length of about 260 nm and width of about 130 nm. Under 980 nm lazer excitation, the Sr2CeO4:Yb3+/Er3+, Sr2CeO4:Yb3+/Tm3+, and Sr2CeO4:Yb3+/Ho3+ nanophosphors exhibit strong green, blue, and green UC luminescence, respectively. The luminescence mechanisms for the doped lanthanide ions were thoroughly analyzed.

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 70%

Synthesis and Up‐conversion Luminescence of Yb³⁺/Ln³⁺ (Ln = Er,Tm,Ho) Co‐Doped Strontium Cerate by Pechini Method

2014

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“…would be radiative transition to ground state through the red emission ( 4 F 9/2 → 4 I 15/2 ). 39 For <5>, 4 I 11/2 state is first populated through GSA process with a 1530 nm photon, following the ESA process by further absorbing an 808 nm photon to give 2 H 11/2 state of Er 3+ . The following processes are very similar to <1>.…”

Section: Resultsmentioning

confidence: 99%

Improved Up-Conversion Luminescence from Er³⁺:LaF₃ Nanocrystals Embedded in Oxyfluoride Glass Ceramics via Simultaneous Triwavelength Excitation

Chen

Jia

et al. 2015

J. Phys. Chem. C

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Up-conversion (UC), harvesting near-infrared (NIR) sunlight, is highly desirable for photovoltaic (PV) cells. In regard to this concept, most of the reported experiments on UC materials and their applications, however, were conventionally studied upon monochromatic laser with narrower excitation band, which is difficult to meet the requirement of solar spectrum conversion. Given the practical applications in PV cells, investigations for UC materials upon simultaneous multi-wavelength even broadband NIR sunlight excitation are much more meaningful. Herein, we studied the UC luminescence properties of germanate oxyfluoride glass ceramics (GCs) containing LaF 3 :Er 3+ nanocrystals with lower phonon energy upon simultaneous tri-wavelength excitation. The UC emission intensities upon simultaneous tri-wavelength excitation were drastically enhanced in comparison with the case that by monochromatic excitation. The UC luminescence mechanisms were interpreted in depth in terms of synergetic UC effect owing to the perturbation in the excited states established by different excitation wavelengths. We demonstrated the application of the simultaneous tri-wavelength excited GCs by adding it to the rear face of the thin-film hydrogenated amorphous silicon (a-Si:H) solar cells. The photoactive current generated by the reflected UC light upon simultaneous tri-wavelength excitation was dramatically enhanced in contrast to the case that upon monochromatic excitation.This Er 3+ -doped germanate oxyfluoride GCs, harvesting broader NIR sunlight photons via simultaneous multi-wavelength excitation, has colossal potential to improve the power conversion efficiency in PV cells in the near future.

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“…5B), this is consistent with the other literature reports. 44,49 To obtain the UCNPs with suitable size and multicolor for cell imaging, the growth time was nally set at 10 h and the uoride sources was chosen as NaF. Fluoride ions increased from 4 to 10 mmol were used to stabilize Ln 3+ ions, subsequently controlled the growth of UCNPs and increased the emission intensity (Fig.…”

Section: Application Of Ucnps As a Luminescent Probe For Living Cellsmentioning

confidence: 99%

A facile synthesis of NaYF₄:Yb³⁺/Er³⁺nanoparticles with tunable multicolor upconversion luminescence properties for cell imaging

Sun

et al. 2014

RSC Adv.

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The ability to manipulate the upconversion luminescence of lanthanide-ion doped fluoride upconversion nanoparticles (UCNPs) is critical and highly desired due to their wide applications in color displays, multiplexing bioassays and multicolor imaging. Here, we developed a facile strategy for simultaneously tuning color output and enhancing upconversion emission of Yb 3+ /Er 3+ doped fluoride UCNPs, based on adjusting the crystalline phases and particle size. With the transformation of crystalline phases from a, a transition state of a mixed b, and finally to b phase, the upconversion emission color output changed from red, yellow, and finally turned green. That is, the UCNPs' emission is sensitive to the crystallite size and phase. Moreover, the fluorescence intensity of the obtained UCNPs became stronger with the crystalline phase changing from a to b. Three kinds of UCNPs including a-UCNPs, a mixed b-UCNPs, and b-UCNPs were used for cell imaging, while the transition state phase a mixed b-UCNPs was the better candidate.

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Effects of the reaction time and size on the up conversion luminescence of NaYF4:Yb(20%),Er(1%) microcrystals

Cited by 27 publications

References 17 publications

Synthesis and Up‐conversion Luminescence of Yb³⁺/Ln³⁺ (Ln = Er,Tm,Ho) Co‐Doped Strontium Cerate by Pechini Method

Synthesis and Up‐conversion Luminescence of Yb³⁺/Ln³⁺ (Ln = Er,Tm,Ho) Co‐Doped Strontium Cerate by Pechini Method

Improved Up-Conversion Luminescence from Er³⁺:LaF₃ Nanocrystals Embedded in Oxyfluoride Glass Ceramics via Simultaneous Triwavelength Excitation

A facile synthesis of NaYF₄:Yb³⁺/Er³⁺nanoparticles with tunable multicolor upconversion luminescence properties for cell imaging

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Effects of the reaction time and size on the up conversion luminescence of NaYF4:Yb(20%),Er(1%) microcrystals

Cited by 27 publications

References 17 publications

Synthesis and Up‐conversion Luminescence of Yb3+/Ln3+ (Ln = Er,Tm,Ho) Co‐Doped Strontium Cerate by Pechini Method

Synthesis and Up‐conversion Luminescence of Yb3+/Ln3+ (Ln = Er,Tm,Ho) Co‐Doped Strontium Cerate by Pechini Method

Improved Up-Conversion Luminescence from Er3+:LaF3 Nanocrystals Embedded in Oxyfluoride Glass Ceramics via Simultaneous Triwavelength Excitation

A facile synthesis of NaYF4:Yb3+/Er3+nanoparticles with tunable multicolor upconversion luminescence properties for cell imaging

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Synthesis and Up‐conversion Luminescence of Yb³⁺/Ln³⁺ (Ln = Er,Tm,Ho) Co‐Doped Strontium Cerate by Pechini Method

Synthesis and Up‐conversion Luminescence of Yb³⁺/Ln³⁺ (Ln = Er,Tm,Ho) Co‐Doped Strontium Cerate by Pechini Method

Improved Up-Conversion Luminescence from Er³⁺:LaF₃ Nanocrystals Embedded in Oxyfluoride Glass Ceramics via Simultaneous Triwavelength Excitation

A facile synthesis of NaYF₄:Yb³⁺/Er³⁺nanoparticles with tunable multicolor upconversion luminescence properties for cell imaging