Synthesis and NIR-to-violet, blue, green, red upconversion fluorescence of Er3+:LaOBr

Wang, Dianyuan; Guo, Yuhai; Zhang, Ende; Chao, Xingbing; Yu, L. S.; Luo, Jun; Zhang, Weiping; Yin, Min

doi:10.1016/j.jallcom.2004.09.077

Cited by 19 publications

(6 citation statements)

References 19 publications

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“…The up‐conversion mechanism of the Yb 3+ –Er 3+ system can be explained according to the experimental results and references , as shown in Fig. .…”

Section: Resultsmentioning

confidence: 98%

“…They can exhibit efficient luminescence via doping with different rare earth activators under X‐ray, ultraviolet (UV) and cathode‐ray excitation . Among the rare earth oxyhalides, Er 3+ ‐doped LaOBr nanomaterials show high up‐conversion luminous efficiency, and have been used in projection televisions, X‐ray intensification and storage systems . Recently, LaOBr or LaOBr:RE 3+ with different morphologies have been synthesized, including bulk particles , feather‐shaped particles and nanorods .…”

Section: Introductionmentioning

confidence: 99%

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Preparation and up‐conversion luminescence properties of LaOBr:Yb³⁺/Er³⁺ nanofibers via electrospinning

Dong

et al. 2014

Luminescence

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LaOBr:Yb(3+)/Er(3+) nanofibers were synthesized for the first time by calcinating electrospun PVP/[La(NO3)3 + Er(NO3)3 + Yb(NO3)3 + NH4 Br] composites. The morphology and properties of the final products were investigated in detail using scanning electron microscopy (SEM), energy dispersion spectroscopy (EDS), X-ray diffractometry (XRD) and fluorescence spectroscopy. The results indicate that LaOBr:Yb(3+)/Er(3+) nanofibers are tetragonal in structure with a space group of P4/nmm. The diameter of LaOBr:Yb(3+)/Er(3+) nanofibers is ~ 147 nm. Under the excitation of a 980-nm diode laser, LaOBr:Yb(3+)/Er(3+) nanofibers emit strong green and red up-conversion emission centering at 519, 541 and 667 nm, ascribed to the (2)H11/2, (4)S3/2 → (4) I(15/2) and (4)F9/2 → (4)I(15/2) energy-level transitions of Er(3+) ions, respectively. The up-conversion luminescent mechanism of LaOBr:Yb(3+)/Er(3+) nanofibers is advanced. Moreover, near-infrared emission of LaOBr:Yb(3+)/Er(3+) nanofibers is obtained under the excitation of a 532-nm laser. The formation mechanism of LaOBr:Yb(3+)/Er(3+) nanofibers is proposed. LaOBr:Yb(3+)/Er(3+) nanofibers could be important up-conversion luminescent materials.

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“…The up‐conversion mechanism of the Yb 3+ –Er 3+ system can be explained according to the experimental results and references , as shown in Fig. .…”

Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Preparation and up‐conversion luminescence properties of LaOBr:Yb³⁺/Er³⁺ nanofibers via electrospinning

Dong

et al. 2014

Luminescence

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“…(d) Refined structure of LaOBr as obtained from XRD, visualized with VESTA (e) Raman spectroscopy on bulk LaOBr. We assigned two A 1g modes, three E g modes, and one B 1g mode based on DFT calculations (Supporting Information, Note 4) and in accordance with the literature: , (f) X-ray powder diffractogram (XRD) of bulk LaOBr with experimental data in red, Rietveld refinement fit in black, literature peak positions in green, and difference in blue …”

Section: Resultsmentioning

confidence: 87%

High-κ Wide-Gap Layered Dielectric for Two-Dimensional van der Waals Heterostructures

Söll,

Lopriore,

Ottesen

et al. 2024

ACS Nano

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van der Waals heterostructures of two-dimensional materials have unveiled frontiers in condensed matter physics, unlocking unexplored possibilities in electronic and photonic device applications. However, the investigation of wide-gap, highκ layered dielectrics for devices based on van der Waals structures has been relatively limited. In this work, we demonstrate an easily reproducible synthesis method for the rare-earth oxyhalide LaOBr, and we exfoliate it as a 2D layered material with a measured static dielectric constant of 9 and a wide bandgap of 5.3 eV. Furthermore, our research demonstrates that LaOBr can be used as a high-κ dielectric in van der Waals field-effect transistors with high performance and low interface defect concentrations. Additionally, it proves to be an attractive choice for electrical gating in excitonic devices based on 2D materials. Our work demonstrates the versatile realization and functionality of 2D systems with wide-gap and high-κ van der Waals dielectric environments.

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“…REOI has lower phonon energies than REOBr due to the larger atomic mass of I − than Br − , so REOI could be used as an effective host for RE activators and may have potential application in manufacturing X-ray intensifying screens. [29][30][31][32] So far, LaOI bulk powders have been prepared via direct solid-state reaction at high temperature. 33,34 Youmo Li prepared LaOI bulk powders as follows: La 2 O 3 and NH 4 I were mixed and reacted under argon flow at 1000 °C for 10 h, or KI and KNO 3 were added into the starting mixture as cosolvents.…”

Section: Introductionmentioning

confidence: 99%

A new route to fabricate LaOI:Yb³⁺/Er³⁺ nanostructures via inheriting the morphologies of the precursors

Dong

Wang

et al. 2014

CrystEngComm

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LaOI:Yb 3+ /Er 3+ nanostructures, including nanofibers and nanobelts, were successfully synthesized by electrospinning combined with a double-crucible iodination method using NH 4 I as the iodine source. X-ray diffraction (XRD) analysis reveals that LaOI:Yb 3+ /Er 3+ nanostructures are tetragonal in structure with a space group of P4/nmm. Scanning electron microscopy (SEM) analysis shows that the diameter of LaOI:Yb 3+ /Er 3+ nanofibers and the width and thickness of LaOI:Yb 3+ /Er 3+ nanobelts are 147.48 ± 17.50 nm, 1.95 ± 0.20 μm and 350 nm, respectively, under the 95% confidence level. Up-conversion (UC) emission spectroscopy analysis shows that LaOI:Yb 3+ /Er 3+ nanostructures emit strong green and red up-conversion emission centered at 523 nm, 540 nm and 667 nm under the excitation of a 980 nm diode laser (DL), which are attributed to 2 H 11/2 → 4 I 15/2 , 4 S 3/2 → 4 I 15/2 and 4 F 9/2 → 4 I l5/2 energy level transitions of Er 3+ , respectively. It is found that the relative intensities of green and red emission vary obviously by changing the molar concentration of Er 3+ ions, and the optimum molar ratio of Yb 3+ to Er 3+ is 10 : 5 in the as-prepared LaOI:Yb 3+ /Er 3+ nanofibers. The possible formation mechanisms of LaOI:Yb 3+ /Er 3+ nanofibers and nanobelts are also proposed.

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Synthesis and NIR-to-violet, blue, green, red upconversion fluorescence of Er3+:LaOBr

Cited by 19 publications

References 19 publications

Preparation and up‐conversion luminescence properties of LaOBr:Yb³⁺/Er³⁺ nanofibers via electrospinning

Preparation and up‐conversion luminescence properties of LaOBr:Yb³⁺/Er³⁺ nanofibers via electrospinning

High-κ Wide-Gap Layered Dielectric for Two-Dimensional van der Waals Heterostructures

A new route to fabricate LaOI:Yb³⁺/Er³⁺ nanostructures via inheriting the morphologies of the precursors

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Synthesis and NIR-to-violet, blue, green, red upconversion fluorescence of Er3+:LaOBr

Cited by 19 publications

References 19 publications

Preparation and up‐conversion luminescence properties of LaOBr:Yb3+/Er3+ nanofibers via electrospinning

Preparation and up‐conversion luminescence properties of LaOBr:Yb3+/Er3+ nanofibers via electrospinning

High-κ Wide-Gap Layered Dielectric for Two-Dimensional van der Waals Heterostructures

A new route to fabricate LaOI:Yb3+/Er3+ nanostructures via inheriting the morphologies of the precursors

Contact Info

Product

Resources

About

Preparation and up‐conversion luminescence properties of LaOBr:Yb³⁺/Er³⁺ nanofibers via electrospinning

Preparation and up‐conversion luminescence properties of LaOBr:Yb³⁺/Er³⁺ nanofibers via electrospinning

A new route to fabricate LaOI:Yb³⁺/Er³⁺ nanostructures via inheriting the morphologies of the precursors