Strong luminescence enhancement of Li2CaSiO4:Eu2+ phosphors by codoping with La3+

Zhong, Jianming; Zhao, Wenzhu; Lan, Licai; Wang, Jianqing

doi:10.1007/s10854-013-1638-8

Cited by 8 publications

(20 citation statements)

References 35 publications

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“…NMR spectroscopy of 29 Si is a particularly well suited technique for differentiating Q n sites. The isotropic chemical shift increases stepwise with decreasing number of bridging oxygens, while Q 4 sites usually resonate at around −110 ppm and Q 0 sites resonate at about −65 ppm.…”

Section: X-ray Powder Diffraction and Stemmentioning

confidence: 99%

“…Thus, when the free induction decay (FID) is governed by T 2 this leads to a spectrum with a "stretched Lorentzian" shape, as observed in the doped crystal samples and the 6 Li spectra of the highly doped glass. Even in the strongly inhomogeneously broadened spectra of 29 Si in the glass sample, a deviation from a purely Gaussian line shape and the appearance of broad tails are observed upon doping (a more quantitative analysis is given in the Supporting Information).…”

Section: X-ray Powder Diffraction and Stemmentioning

confidence: 99%

“…The measured 29 Si and 6 Li relaxation times are shown in Figure 4 as a function of paramagnetic Gd(III) content. Upon doping, the T 1 relaxation times drop by at least 1 order of magnitude, compared to the undoped samples.…”

Section: X-ray Powder Diffraction and Stemmentioning

confidence: 99%

“…Good agreement is obtained between the experimental sweeps and the SE simulation. This includes the small feature at the center of the 6 Li sweep, which arises from the shape of the powder pattern and is obscured in the 29 Si sweep due to its larger Included in the figures are the simulated EPR spectrum (solid black line) and the corresponding simulation of the DNP sweep profile of the solid effect (dotted lines) and cross effect (dashed lines). The position of the field in (D) corresponds to the inner satellite transition, while all others correspond to the central transition.…”

Section: X-ray Powder Diffraction and Stemmentioning

confidence: 99%

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The Effect of Disorder on Endogenous MAS-DNP: Study of Silicate Glasses and Crystals

et al. 2023

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In dynamic nuclear polarization nuclear magnetic resonance (DNP-NMR) experiments, the large Boltzmann polarization of unpaired electrons is transferred to surrounding nuclei, leading to a significant increase in the sensitivity of the NMR signal. In order to obtain large polarization gains in the bulk of inorganic samples, paramagnetic metal ions are introduced as minor dopants acting as polarizing agents. While this approach has been shown to be very efficient in crystalline inorganic oxides, significantly lower enhancements have been reported when applying this approach to oxide glasses. In order to rationalize the origin of the difference in the efficiency of DNP in amorphous and crystalline inorganic matrices, we performed a detailed comparison in terms of their magnetic resonance properties. To diminish differences in the DNP performance arising from distinct nuclear interactions, glass and crystal systems of similar compositions were chosen, Li2OCaO·2SiO2 and Li2CaSiO4, respectively. Using Gd(III) as polarizing agent, DNP provided signal enhancements in the range of 100 for the crystalline sample, while only up to around factor 5 in the glass, for both 6Li and 29Si nuclei. We find that the drop in enhancement in glasses can be attributed to three main factors: shorter nuclear and electron relaxation times as well as the dielectric properties of glass and crystal. The amorphous nature of the glass sample is responsible for a high dielectric loss, leading to efficient microwave absorption and consequently lower effective microwave power and an increase in sample temperature which leads to further reduction of the electron relaxation time. These results help rationalize the observed sensitivity enhancements and provide guidance in identifying materials that could benefit from the DNP approach.

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Section: X-ray Powder Diffraction and Stemmentioning

confidence: 99%

Section: X-ray Powder Diffraction and Stemmentioning

confidence: 99%

Section: X-ray Powder Diffraction and Stemmentioning

confidence: 99%

Section: X-ray Powder Diffraction and Stemmentioning

confidence: 99%

See 2 more Smart Citations

The Effect of Disorder on Endogenous MAS-DNP: Study of Silicate Glasses and Crystals

et al. 2023

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“…Over the past decade, research on composites with coreshell structures has become an active field because of their unique physical and chemical properties and great potential applications in the areas of electronics, photonics, catalysis, biology, and nanotechnology [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Preparation and luminescent properties of doped with Eu3+ ions YVO4 nanophosphors

Yuan

Qiao

Yang

2014

J Mater Sci: Mater Electron

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Synthesis and luminescence enhancement of Eu3+/Sm3+ co-doped Ca9Bi(VO4)7 phosphor for white-light-emitting diodes

Qiu

Zhang

et al. 2019

J Mater Sci: Mater Electron

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Strong luminescence enhancement of Li2CaSiO4:Eu2+ phosphors by codoping with La3+

Cited by 8 publications

References 35 publications

The Effect of Disorder on Endogenous MAS-DNP: Study of Silicate Glasses and Crystals

The Effect of Disorder on Endogenous MAS-DNP: Study of Silicate Glasses and Crystals

Preparation and luminescent properties of doped with Eu3+ ions YVO4 nanophosphors

Synthesis and luminescence enhancement of Eu3+/Sm3+ co-doped Ca9Bi(VO4)7 phosphor for white-light-emitting diodes

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