Effects of Li+ co-doping on the concentration quenching threshold and luminescence of GdVO4:Eu3+ nanophosphors

Yan, Yinglin; Zhang, Wei; Ren, Bing; Zhong, Lisheng; Xu, Yunhua

doi:10.1007/s11581-016-1879-7

Cited by 10 publications

(6 citation statements)

References 30 publications

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“…It is inspiring that certain rare‐earth oxides have successfully improved the electrochemical performances of the S cathode for Li‐S batteries . Moreover, gadolinium ion (Gd 3+ )‐based materials are important candidates for many application areas because of appropriate ionic radius and high excitation energy of Gd 3+ with seven unpaired electrons in its electronic configuration …”

Section: Introductionmentioning

confidence: 73%

“…28 Moreover, gadolinium ion (Gd 3+ )-based materials are important candidates for many application areas because of appropriate ionic radius and high excitation energy of Gd 3+ with seven unpaired electrons in its electronic configuration. 29 In this presented work, a typical rare-earth oxide, Gd 2 O 3 , with ultrafine particle size, is in-situ introduced in CA, which is further utilized as S host materials for Li-S batteries. The adverse influence of weak conductivity from the semiconductive nature of Gd 2 O 3 would be mitigated by their ultrasmall size and uniform distribution.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of ultrafine Gd₂O₃nanoparticles/carbon aerogel composite as immobilization host for cathode for lithium‐sulfur batteries

et al. 2019

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Summary Carbon aerogel (CA), possessing abundant pore structures and excellent electrical conductivity, have been utilized as conductive sulfur hosts for lithium‐sulfur (Li‐S) batteries. However, a serious shuttle effect resulted from polysulfide ions has not been effectively suppressed yet due to the weak absorption nature of CA, resulting in rapid decay of capacity as the cycle number increases. Herein, ultrafine (~3 nm) gadolinium oxide (Gd2O3) nanoparticles (with upper redox potential of ~ 1.58 V versus Li+/Li) are uniformly in‐situ integrated with CA through directly sol‐gel polymerization and high‐temperature carbonization. The Gd2O3 modified CA composites (named as Gdx‐CA, where x means molar ratio of Gd2O3 nanoparticles to carbon) are incorporated with S. Then, the products (S/Gdx‐CA) are acted as sulfur host materials for Li‐S batteries. The results demonstrate that adding ultrafine Gd2O3 nanoparticles can dramatically improve the electrochemical properties of the composite cathodes. The S/Gd2‐CA electrode (loading with 58.9 wt% of S) possesses the best electrochemical properties, including a high initial capacity of 1210 mAh g−1 and a relatively high capacity of 555 mAh g−1 after 50 cycles at 0.1 C. It is noteworthy that the performance of long‐term cycle (350 cycles) for the S/Gd2‐CA (317 mAh g−1 after 100 cycles and 233 mAh g−1 after 350 cycles at 1 C) is improved significantly than that of S/CA (150 mAh g−1 after 150 cycles at 1 C). Overall, the enhancement of electrochemical performances can be due to the strong polar nature of the ultrafine Gd2O3 nanoparticles, which provide strong adsorption sites to immobilize S and polysulfide. Furthermore, the Gd2O3 nanoparticles present a catalytic effect. Our research suggests that adding Gd2O3 nanoparticles into S/CA composite cathode is an effective and novelty method for improving the electrochemical performances of Li‐S batteries.

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Section: Introductionmentioning

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Fabrication of ultrafine Gd₂O₃nanoparticles/carbon aerogel composite as immobilization host for cathode for lithium‐sulfur batteries

et al. 2019

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“…When the codoping of Li + is occupied in lattice sites substitutionally it shows the decrease of emission intensity of Y 2 O 3 :Eu 3+ , Li + nanophosphor, whereas if Li + ion occupies in the lattice sites interstitially it shows the enhancement of the emission intensity. 42 Aer entering the interstitial site, Li + ion can bring the host lattice expansion, thus the variation of lattice constant is occurs. In the case of 0.5, 1, 3, 5, and 9 at% codoping concentration, Li + ions dominant substitutional occupation leads to low luminescent intensity.…”

Section: Resultsmentioning

confidence: 99%

The effect of lithium on structural and luminescence performance of tunable light-emitting nanophosphors for white LEDs

2020

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“…However, another key issue in today‘s design of materials with higher luminous efficiency/brightness is the low emitter ion concentrations limited to 1∼5 mol% [18] . In our previous work, it was found that Li + co‐doping alleviated the CQ effect of GdVO 4 : Eu 3+ , and the concentration quenching threshold of Eu 3+ increased significantly [19] …”

Section: Introductionmentioning

confidence: 98%

Emission Brightness and Concentration Quenching Threshold of GdVO₄ : Eu³⁺ Nanophosphors Co‐Doped with Alkali Metal Ions

et al. 2021

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GdVO4 : Eu3+ nanophosphors co‐doped with alkali metal ions (Li+, Na+, K+) of various concentrations were fabricated by an efficient hydrothermal method. The microstructure and luminescent emission properties were tested systematically. The results demonstrated that the co‐doping of M+ led to lattice distortion, which is closely related to dopants’ ionic radii and concentrations. The lattice distortion further resulted in a fluctuation of luminescent brightness. The optimal luminescent properties of GdVO4 : Eu3+ co‐doped with Li+(10 atom‐% (at. %)), Na+(8 at. %), K+(6 at. %) were achieved respectively. Among them, the GdVO4 : Eu3+ co‐doped with Li+ of 10 at % possessed the highest emission intensity. Moreover, the alkali metal ions co‐doping also gave rise to the elevation of the concentration quenching threshold of Eu3+, which further enhanced the luminescent performance.

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Effects of Li+ co-doping on the concentration quenching threshold and luminescence of GdVO4:Eu3+ nanophosphors

Cited by 10 publications

References 30 publications

Fabrication of ultrafine Gd₂O₃nanoparticles/carbon aerogel composite as immobilization host for cathode for lithium‐sulfur batteries

Fabrication of ultrafine Gd₂O₃nanoparticles/carbon aerogel composite as immobilization host for cathode for lithium‐sulfur batteries

The effect of lithium on structural and luminescence performance of tunable light-emitting nanophosphors for white LEDs

Emission Brightness and Concentration Quenching Threshold of GdVO₄ : Eu³⁺ Nanophosphors Co‐Doped with Alkali Metal Ions

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Effects of Li+ co-doping on the concentration quenching threshold and luminescence of GdVO4:Eu3+ nanophosphors

Cited by 10 publications

References 30 publications

Fabrication of ultrafine Gd2O3nanoparticles/carbon aerogel composite as immobilization host for cathode for lithium‐sulfur batteries

Fabrication of ultrafine Gd2O3nanoparticles/carbon aerogel composite as immobilization host for cathode for lithium‐sulfur batteries

The effect of lithium on structural and luminescence performance of tunable light-emitting nanophosphors for white LEDs

Emission Brightness and Concentration Quenching Threshold of GdVO4 : Eu3+ Nanophosphors Co‐Doped with Alkali Metal Ions

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Product

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Fabrication of ultrafine Gd₂O₃nanoparticles/carbon aerogel composite as immobilization host for cathode for lithium‐sulfur batteries

Fabrication of ultrafine Gd₂O₃nanoparticles/carbon aerogel composite as immobilization host for cathode for lithium‐sulfur batteries

Emission Brightness and Concentration Quenching Threshold of GdVO₄ : Eu³⁺ Nanophosphors Co‐Doped with Alkali Metal Ions