JOURNAL OF FLUORINE CHEMISTRY
·
2024
·
IF 1.7
Shaohua Wu,Yu Yang,Shuang Wu,Yanhui Dong,Hao Cui,Daguang Li,Weiping Qin
NaLuF 4 :Yb 3+ ,Er 3+ micrometer prismatic crystals are potential materials for the preparation of optical waveguide devices. However, structural defects and OH – groups are generated inside and on their surfaces during growth processes. The structural defects and OH – groups lead to a large depletion of excitation energy and severely quench the downconversion luminescence of Er 3+ . In addition, the Yb 3+ /Er 3+ co-doping ratio significantly affects the downconversion luminescence of the microcrystals, which in turn affects the performance of the optical waveguide amplifiers based on the microcrystals. By adjusting the co-doping ratio of Yb 3+ and Er 3+ in the microcrystals and removing the defects in the crystals, their downconversion luminescence performance was significantly improved. The results showed that the downconversion luminescence under the excitation from a 980 nm laser reached the maximum value when the doping ratio of Yb 3+ and Er 3+ was 20:1.5. In addition, the OH – groups and structural defects in the micrometer crystals were significantly eliminated by ion-exchange and high-temperature annealing treatments, and the crystalline quality was significantly improved. After ion-exchange and high-temperature annealing treatments, the downconversion luminescence enhancement of NaLuF 4 :Yb 3+ ,Er 3+ microcrystals was 2.5 times that of the untreated samples.
研究领域:
材料科学
·
光学
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产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 61
·38506-38511
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IF 3.108
Haiyong Guo,Zhen Hu,Li Zhao,Li Wan,Yadan Wu,Shimin Wang
A new strategy to improve the efficiency of dye-sensitized solar cells by using the external near-infrared light harvesting and light-scattering dual-functional upconversion (UC) material NaLuF4:Yb3+/Er3+ is proposed. The photoluminescence spectra of NaLuF4:Yb3+/Er3+ showed the emission of green and red light, and these luminescence bands coincided well with the absorption wavelength of N719 dye. A small amount of UC material could serve as a good scattering material in photoelectrodes. The photoelectric conversion efficiency reaches 7.58% at a concentration of 5 wt% of UC (weight ratio of UC to TiO2), which is 27.18% higher than that of P25 photoanode (5.96%) with similar thickness. This finding may be attributed to the UC luminescence and light scattering properties of the UC material.
研究领域:
材料科学
·
光伏技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Zhen Hu,Li Zhao,Wenlu Li,Shimin Wang,Binghai Dong
A composite film was prepared by mixing NaLuF 4 :Yb 3+ /Er 3+ up-conversion luminescent material with commercial P25, and a scattering layer composed of flower-like TiO 2 was added on to the composite film (UC/P25) to form a double-layer composite film (UC/P25 + FT). An AgNO 3 solution was irradiated by ultraviolet light to deposit nano-Ag particles on the prepared double-layer film, and a nano-Ag modified double-layer film (UC/P25 + FT + Ag) was finally obtained. The synergistic effect of the three improved methods conferred the UC/P25 + FT + Ag film with a wide spectral absorption range, strong light-scattering ability, and strong light absorption capability, which greatly improved the photoelectric performance of the film. The maximum photoelectron conversion efficiency of dye-sensitized solar cells with the UC/P25 + FT + Ag photoanode reached up to 8.14%, which increased by 32.36% compared with that of the pure P25 film photoelectrode .
研究领域:
材料科学
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光电子学
·
能源科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 38
·15682-15690
·
IF 5.7
Guotao Xiang,Yuanyuan Yi,Zhen Liu,Yanhong Li,Zhiyu Yang,Yongjie Wang,Sha Jiang,Xiao Tang,Xianju Zhou,Li Li,Xiaojun Wang,Jiahua Zhang
Developing efficient photocatalysts that respond to near-infrared (NIR) light holds significant scientific importance for improving the utilization of solar energy. In this study, the photocatalyst β-NaLuF4:Yb3+/Tm3+@TiO2 that simultaneously responds to both ultraviolet (UV) and NIR light is successfully synthesized. Instead of the conventional use of β-NaYF4:Yb3+/Tm3+, β-NaLuF4:Yb3+/Tm3+ upconversion (UC) nanoparticles (NPs) are employed as the NIR-UV light converter to achieve stronger UV UC luminescence. The data indicate that the photocatalytic degradation efficiency and rate of β-NaLuF4:Yb3+/Tm3+@TiO2 synthesized in this work are superior to those of NIR-driven photocatalysts based on β-NaYF4:Yb3+/Tm3+ under both NIR and sunlight irradiation. Further analysis of the UC emission spectra and the decay curves of the samples reveals an effective fluorescence resonance energy transfer (FRET) process between β-NaLuF4:Yb3+/Tm3+ and TiO2 after the combination, which makes the NIR-driven photocatalytic reactions happen. All results confirm that the present β-NaLuF4:Yb3+/Tm3+@TiO2 is an exceptionally efficient photocatalyst, owing to its responsiveness to both UV and NIR light.
研究领域:
材料科学
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2014
·Vol. 14
·期 5
·3722-3725
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IF 1.339
Song Weiye,Guo Xingyuan,He Guanghui,Qin Weiping
β-NaLuF4:20%Yb,0.5%Tm,x%Gd (x = 10,20, 30) nanocrystals were synthesized by high temperature thermal decomposition method. X-ray diffraction (XRD) show the as-prepared samples are characteristic of a pure β-NaLuF4. Transmission
electron microscope (TEM) investigations indicate the nanocrystals have particle size of ∼85 nm with good monodispersity and well-defined crystallographic facets. Particularly, under 980 nm excitation, upconversion (UC) emissions in the UV range of 270–320 nm were observed in these
nanocrystals, which further prove that β-NaLuF4 is an excellent host for building UV compact solid-state lasers or fiber lasers.
研究领域:
材料科学
·
纳米技术
·
光学
✓ 已验证
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Chen Zhang,Chuan Ding,Mingyue Li,Jinyang Zhou,Tao Yuan,Zhemin Shen
The infrared energy of the sun’s rays accounts for more than 40 %. Heterostructures were constructed to enable broad-spectrum response of photocatalysts, and enhance the utilization of sunlight, especially that of infrared lights. A robust heterostructured upconversion composite material decorated with Ag nanoparticles (AgNPs), β-NaLuF 4 @ NaLuF 4 :Yb 3+ ,Tm 3+ @ AgNPs@BiOBr (NLF@NLFT@Ag@Bi), was built through a multi-step hydrothermal method. NLF@NLFT@Ag@Bi demonstrates enhanced photocatalytic activity under UV–Vis-NIR, Vis-NIR, and NIR irradiation compared to pure BiOBr and NLF@NLFT@Ag/BiOBr mixture, achieving 99 % Rhodamine B (RhB) degradation in 0.5 h (UV–Vis-NIR) and 96 % in 3 h (NIR), with degradation over 80 % for Bisphenol A (BPA), Norfloxacin (Nor), and Methyl Orange (MO) in 3 h (UV–Vis-NIR). The upconversion luminescence (UCL) of NLF@NLFT@Ag is tuned by its core–shell structure and AgNPs’ plasmonic effect, while NLF@NLFT@Ag@Bi’s enhanced photocatalysis arises from boosted UCL and AgNPs-facilitated Förster resonance energy transfer (FRET) between NLFT and BiOBr. The material’s efficacy in infrared-driven photocatalysis offers a prospective approach for extending catalyst response ranges. It greatly enhances degradation effects of organic pollutants under sun’s rays.
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DOI
高影响因子
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