The Role of Trap Symmetry in an Atom-Chip Interferometer above the Bose-Einstein Condensation Threshold

Dupont-Nivet, Matthieu; Westbrook, Christoph I; Schwartz, Sylvain

doi:10.1109/cleoe-eqec.2019.8872823

Cited by 5 publications

(5 citation statements)

References 6 publications

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“…The rendition ability of the white light with increasing concentration of Ce/Tb-KCPO phosphor can be validated via the color rendering index (CRI) along with color quality scale (CQS), which will be shown in Figures 6 and 7,  ISSN: 2302-9285 respectively. As illustrated, heightened concentration values of the phosphor decrease the CRI and CQS [22]- [24]. The color rendition can be enhanced with wide-band emission that can cover the orange-red region.…”

Section: Phosphor Influence On White Light-emitting Diodesmentioning

confidence: 90%

Spatial uniformity of the spectral radiance by white LED-based K2CaP2O7:Ce3+, Tb3+ phosphor

Tung

Thi

2023

Bulletin EEI

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The K2CaP2O7:Ce3+, Tb3+ (Ce/Tb-KCPO) phosphor with blue-to-green emission is introduced in this study. The synthesis of the phosphor is carried out with the solid-state approach. The phosphor characteristics, including X-ray diffraction, luminescence lifespan, and thermal stability are measured and examined. The data show that Ce/Tb-KCPO phosphor displays a broadband emission from blue to green when excited by ultraviolet source. Besides, the ion Ce3+ strengthen the emission of Tb3+ ion through an efficient energy-transfer mechanism, which is estimated about 82.51%. The main electric interaction responsible for this Ce/Tb energy transfer is the dipole-quadrupole one. The phosphor also benefits the luminous intensity and color uniformity of the light-emitting diodes (LED) white-light output. Therefore, the Ce/Tb-KCPO phosphor can be a potential material for high-power white light-emitting diodes (WLED).

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Section: Phosphor Influence On White Light-emitting Diodesmentioning

confidence: 90%

Spatial uniformity of the spectral radiance by white LED-based K2CaP2O7:Ce3+, Tb3+ phosphor

Tung

Thi

2023

Bulletin EEI

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“…In this report, both the LightTools program and the Mie-theory are utilized to create the simulation of the LED and for experiments and results verification [21], [22]. After successfully fabricating the red phosphor Ca5B2SiO10:Eu 3+ , the WLED dual-layer remote phosphor structure can be simulated with the correlated color temperature of 5600 K. Then, the experimented can be carried out to investigate the influences of this red phosphor on the lighting performances.…”

Section: Simulationmentioning

confidence: 99%

The study of convex-dual-layer remote phosphor geometry in upgrading WLEDs color rendering index

Dang

Loan

Chung

et al. 2021

IJECE

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The white-light light-emitting diode (LED) is a semiconductor light source that usually has one chip and one phosphor layer. Because of that simple structure, the color rendering index (CRI) is really poor. Therefore, structure with double layer of phosphor and multiple chips has been studied with the phosphorus proportions and densities in the silicone are constantly changed to find the best option to improve optical properties. In research, we use red phosphor Ca5B2SiO10:Eu3+ layer to place above the yellow phosphor one, and both of them have a convex design. Then, the experiments and measurements are carried out to figure out the effects of this red phosphor as well as the convex-double-layer remote phosphor design on the LED’s performances. The measured results reveal that the light output is enhanced significantly when using convex-dual-layer structure instead of the single-layer design. Additionally, the Ca5B2SiO10:Eu3+ concentration benefits CRI and CQS at around 6600 K and 7700 K correlated color temperature (CCT). Yet, the lumen output shows a slight decline as this red phosphor concentration surpass 26% wt. Through the experiments, it is found that a double layer of chip and double phosphorus is the best structure which could support the quality of CRI and luminous flux.

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“…In illumination market, WLED devices which use the diodes to create white light have been proved to be the potential generation solid-state lighting source which can probably be an alternate to the conventional fluorescent and incandescent ones, as they perform impressive features including longevity, high efficiency, cost saving, and being eco-friendly [1][2][3][4]. One of the most popular methods to create WLED devices is freely dispensing the yellow phosphor yttrium aluminum garnet (YAG:Ce) onto a blue LED chip [5,6].…”

Section: Introductionmentioning

confidence: 99%

Investigation on the application of ZnO nanostructures to improve the optical performance of white light-emitting diodes

2021

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Though combining blue LED chips with yellow phosphor has been the most common method in white light-emitting diode (WLED) production, the attained angular correlated color temperature (CCT) uniformity is still poor. Thus, this article proposes to add ZnO nanostructures to WLED packages to promote the color uniformity of the WLEDs. The outcomes of the research demonstrate that utilizing ZnO at different amount can affect the scattering energy and the CCT deviations in WLEDs packages in different extents. Particularly, adding the node-like (N-ZnO), sheet-like (S-ZnO), and rod-like (R-ZnO) leads to the corresponding decreases of CCT deviations from 3455.49 K to 96.30 K, 40.03 K, and 60.09 K, respectively. Meanwhile, with 0.25% N-ZnO, 0.75% S-ZnO, and 0.25% R-ZnO, WLED devices can achieve both better CCT homogeneity and lower reduction in luminous flux. The results of this article can be a valuable document for the manufacturer to use as reference in improving their WLED products.

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The Role of Trap Symmetry in an Atom-Chip Interferometer above the Bose-Einstein Condensation Threshold

Cited by 5 publications

References 6 publications

Spatial uniformity of the spectral radiance by white LED-based K<sub>2</sub>CaP<sub>2</sub>O<sub>7</sub>:Ce<sup>3+</sup>, Tb<sup>3+</sup> phosphor

Spatial uniformity of the spectral radiance by white LED-based K<sub>2</sub>CaP<sub>2</sub>O<sub>7</sub>:Ce<sup>3+</sup>, Tb<sup>3+</sup> phosphor

The study of convex-dual-layer remote phosphor geometry in upgrading WLEDs color rendering index

Investigation on the application of ZnO nanostructures to improve the optical performance of white light-emitting diodes

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