Preparation and characteristics of core–shell structure Y3Al5O12:Yb3+@SiO2 nanoparticles

Sun, Yan–Hui; Yang, Zhongmin; Xie, Chengning; Jiang, Zhonghong

doi:10.1016/j.jallcom.2012.02.105

Cited by 15 publications

(3 citation statements)

References 32 publications

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“…Figure 11a also depicts that the higher the thickness of YAG:Ce shell, the higher is the maximum intensity in the PL spectrum. As can be seen, SiO 2 @YAG:Ce (1.0 at.% Ce) nanoparticles show the highest emission, compared to commercial and synthesized SiO 2 /YAG:Ce mixture composite, that is in agreement with similar works in this field [20][21][22][48][49][50][51]. The increased PL intensity of YAG:Ce in the core-shell state is believed to result from the inhibition of surface states in YAG:Ce nanoparticles and the higher light extraction at the SiO 2 /YAG:Ce interface.…”

Section: Photoluminescence (Pl) and Diffuse Transmission Spectra (Dtssupporting

confidence: 90%

Towards Multi-Functional SiO2@YAG:Ce Core–Shell Optical Nanoparticles for Solid State Lighting Applications

et al. 2020

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This paper aims to investigate the synthesis, structure, and optical properties of SiO2@YAG:Ce core–shell optical nanoparticles for solid state lighting applications. YAG:Ce phosphor is a key part in white light emitting diodes (LEDs), with its main functionality being the generation of yellow light. Generated yellow light from phosphor will be combined with blue light, emitted from chip, resulting in the generation of white light. Generated light in LEDs will often be scattered by SiO2 nanoparticles. SiO2 nanoparticles are often distributed within the optical window, aiming for a more homogeneous light output. The main idea in this research is to combine these functionalities in one core–shell particle, with its core being SiO2 and its shell being phosphor. In this study core–shell nanoparticles with different Ce3+ concentrations were synthesized by a sol–gel method. Synthesized nanoparticles were characterized by X-ray diffraction (XRD), small angle X-ray scattering (SAXS) analysis, high resolution transmission electron macroscopy (HRTEM), Fourier transform infrared (FTIR), and photoluminescence spectroscopy. Luminescence characteristics of SiO2@YAG:Ce core–shell particles were compared with that of SiO2/YAG:Ce mixture composite, which is now used in commercial LEDs. Obtained results showed that core–shell nanoparticles have comparatively much better optical properties, compared to SiO2/YAG:Ce mixture composite and can therefore be potentially used in LEDs.

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Section: Photoluminescence (Pl) and Diffuse Transmission Spectra (Dtssupporting

confidence: 90%

Towards Multi-Functional SiO2@YAG:Ce Core–Shell Optical Nanoparticles for Solid State Lighting Applications

et al. 2020

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“…To resolve this problem, besides other well-established techniques, the method based on semiconductor photocatalysts is a promising solution to degrade organic pollutants in wastewater [1][2][3][4][5]. To date, the semiconductor TiO 2 has undoubtedly proven to be one of the most excellent photocatalysts for the oxidative decomposition of many organic compounds [6][7][8]. Unfortunately, due to its wide band-gap of 3.2 eV, TiO 2 can only responds to ultraviolet irradiation but not to visible light that accounts for 43% of the incoming solar energy [9].…”

Section: Introductionmentioning

confidence: 99%

A superior visible light-driven photocatalyst: Europium-doped bismuth tungstate hierarchical microspheres

Tian

Zhang

2012

Journal of Alloys and Compounds

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“…Notably, except excited by the 980 nm, the Yb 3+ ions can also be excited at 940 and 915 nm lasers and then transfer energy to Ho 3+ ions by ET process [32][33]. To further explore the in uence of different excitation sources on the emission spectra for the SrF 2 :Yb 3+ /Ho 3+ NCs, we further investigate the photoluminescence properties of SrF 2 :Yb 3+ /Ho 3+ (12/0.1 mol%) NCs under the 980, 940 and 915 nm excitations with the same pumping power density (11 W cm -2 ), as shown in Figure 4.…”

Section: And Ucl Propertiesmentioning

confidence: 99%

Boltzmann- and non-Boltzmann-based thermometers in the first, second and third biological windows for the SrF2:Yb3+,Ho3+ nanocrystals under 980, 940 and 915 nm excitations

Wang

Yuan

et al. 2022

Preprint

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Spectrally determination of temperature based on the lanthanide-doped nanocrystals (NCs) is a vital strategy to noninvasively measure the temperature in practical applications. Here, we synthesized a series of SrF2:Yb3+/Ho3+ NCs and simultaneously observed the efficient visible upconversion luminescence (UCL) and near-infrared (NIR) downconversion luminescence (DCL) under 980, 940 and 915 nm excitations. Subsequently, these NCs were further utilized for thermometers based on the Boltzmann (thermally-coupled levels, TCLs) and non-Boltzmann (non-thermally-coupled levels, NTCLs) of Ho3+ ions in the first (~ 650 nm), second (~ 1012 nm) and third (~ 2020) biological windows (BW-I, BW-II and BW-III) under tri-wavelength excitations. The thermometric parameters including the relative sensitivity (\({S_{\text{r}}}\)) and temperature uncertainty (\(\delta T\)) are quantitatively determined on the I648/I541 (BW-I), I1186/I1012 (BW-II), and I1950/I2020 (BW-III) transitions of Ho3+ ions in the temperature range of 303–573 K. Comparative experimental results demonstrated that the thermometer has superior performances.

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Preparation and characteristics of core–shell structure Y3Al5O12:Yb3+@SiO2 nanoparticles

Cited by 15 publications

References 32 publications

Towards Multi-Functional SiO2@YAG:Ce Core–Shell Optical Nanoparticles for Solid State Lighting Applications

Towards Multi-Functional SiO2@YAG:Ce Core–Shell Optical Nanoparticles for Solid State Lighting Applications

A superior visible light-driven photocatalyst: Europium-doped bismuth tungstate hierarchical microspheres

Boltzmann- and non-Boltzmann-based thermometers in the first, second and third biological windows for the SrF2:Yb3+,Ho3+ nanocrystals under 980, 940 and 915 nm excitations

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