Investigation of the tin-doped phosphor (Sr,Mg)3(PO4)2:Sn2+ for fluid temperature measurements

Fond, Benoît; Abram, Christopher; Pougin, Miriam; Beyrau, Frank

doi:10.1364/ome.9.000802

Cited by 24 publications

(34 citation statements)

References 27 publications

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“…In (1), N(r) is the distribution density of diffusional particles (mm 3 ) and C sca indicates the scattering cross sections (mm 2 ). In (2), p(θ,λ,r) means the phase function, θ exhibits the scattering angle (°C), and f(r) indicates the size distribution function of the diffusor in the phosphor film and this parameter can be computed by expressions (4) and (5). Besides that, λ presents the light wavelength (nm), and r is known as radius of diffusional particles (µm).…”

Section: Scattering Analysismentioning

confidence: 99%

“…With the constant growth in demands of lighting applications, it is crucial for pc-LED to achieve a new development in its optical performance. Therefore, the three most important elements in pc-LED production that directly affect the quality of light output are the main concerns [1,2]. The most common method to fabricate white light is to blend the yellow light from the mixture of yellow phosphor YAG:Ce 3+ and silicone glue with the blue light from the LED chips.…”

Section: Introductionmentioning

confidence: 99%

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The Application of Calcium Carbonate CaCO3 and Titania TiO2 for Color Homogeneity and Luminous Flux Enhancement in PC-LEDs

Pham

Phan

Luo³

et al. 2021

J. ADV. ENG. COMPUT.

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This article studies the development method of pc-LED, a phosphor-converted lighting emitting diode, with scattering enhancement particles (SEPs) at 7000 K correlated color temperature. The pc-LED is an advanced lighting solution that has been applied in many different categories; nonetheless, to keep up with the demands of modern lighting, the pc-LEDs need to enhance the color homogeneity and luminous flux. The detailed experiments on the two SEPs used in the articles are also presented. The experiments include combining each of these SEPs with a yellow phosphor Y3Al5O12:Ce3+ to test their properties and influences on the lighting of pc-LEDs. The scattering coefficients, the anisotropic scattering, the reduced scattering, and the scattering amplitudes at 450 nm and 550 nm are the subjects of SEPs study. The LightTools program is used to create the simulation of pc-LED, the results of the optical simulation will then be verified with the Mie-scattering theory. The findings of the research conclude that TiO2 particles are the best for the growth of color homogeneity while CaCO3 particles are effective in limiting the color deviation in correlated color temperature. Even though the SEPs benefit the lighting performance, their concentration must be managed to be under an acceptable amount to ensure desired results and avoid unwanted damages.This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium provided the original work is properly cited.

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Section: Scattering Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Application of Calcium Carbonate CaCO3 and Titania TiO2 for Color Homogeneity and Luminous Flux Enhancement in PC-LEDs

Pham

Phan

Luo³

et al. 2021

J. ADV. ENG. COMPUT.

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show abstract

“…In general, a diffuser sheet is a tool to maintain uniformity in allocation and radiation of correlated color temperature (CCT). However, the results show the energy loss in the process of light transmission through the sheet [17][18][19]. Though resulting in low light efficiency, these approaches get better color uniformity.…”

Section: Introductionmentioning

confidence: 99%

Enhance the chromatic uniformity and luminous efficiency of WLEDs with triple-layer remote phosphor structures

Loan

2020

IJECE

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The angular color uniformity (ACU) with the ability to evaluate chromatic performance of WLED has become an important target to achieve in producing higher-quality WLEDs. This paper studies the ACU enhancing effects of novel triple-phosphor configuration in lighting devices with remote phosphor structure. Moreover, the optical influences of remote phosphor structure with three phosphor layers (TL) on WLEDs properties are calculated and compared to the dual-layer (DL) one for reference. The experiments are applied to devices at 5 distinct correlated color temperature ranging from 5600-8500 K. The results presented that DL structure attains better color rendering index (CRI) than the TL one. Meanwhile, in terms of color quality scales (CQS), TL model shows higher values at all ACCTs, compared to the DL. Moreover, the luminous flux of DL configuration is lower than that of TL structure. In addition, the diversion of color temperature depicts as D-CCT in TL structure is much better than the value in DL structure, especially at high ACCT as 8500 K, which means TL is good for chromatic uniformity of high ACCTs WLEDs. These results proved that the triple-layer structure is superior and more effective to apply for acquiring the enhancement of WLEDs package.

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“…One of the studies suggests using an encapsulated inverted cone lens surrounded by a remote phosphor layer that can deect the light from the chip on to the LED surface reducing light loss caused by the LED's inner circulation eect [12]- [15]. Another one employs a patterned remote phosphor structure with vacant perimeter area, which means no coating phosphor on the surrounding surface, to obtain high angular-dependent correlated color temperature consistency and chromatic stability [16]. In addition, the application of a patterned sapphire substrate to remote phosphor structure results in superior correlated color temperature uniformity in a far-eld patterned compared to a conventional one [17,18].…”

Section: Introductionmentioning

confidence: 99%

The Impacts of Red-emitting Mg2TiO4:Mn4+ Phosphor on Color Quality of Dual-layer Remote Phosphor Configuration

Lee¹,

Le²,

Anh³

2019

J. ADV. ENG. COMPUT.

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In terms of luminous flux, the remote phosphor structure is better than conformal structure or in-cup phosphor structure, however, this structure often has inferior color quality compared to the others. As a result, many studies have been conducted to nd a solution to the drawback mentioned above. In this research, we are after the same goal using WLEDs structure with color temperature of 5600 K and come to the conclusion that dual-layer phosphor structure can improve the color rendering index (CRI) and the color quality scale (CQS). The concept of the research is to place red phosphor layer Mg2TiO4:Mn4+ on a yellow phosphor layer YAG:Ce3+ and locate the concentration of Mg2TiO4:Mn4+ that allows the color quality to reach the highest value. The result shows that Mg2TiO4:Mn4+ benets CRI and CQS, more specifically, the addition of Mg2TiO4:Mn4+ in WLEDs boosts the red light component, thus, enhancing CRI and CQS. However, it is demonstrated through the application of Mie-scattering theory and Lambert-Beer law that when the concentration of Mg2TiO4:Mn4+ exceed the limit, it can harm the luminous flux of WLEDs. The result of this research is a valuable contribution to improving the techniques of manufacturing better WLEDs with higher white light quality. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium provided the original work is properly cited.

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Investigation of the tin-doped phosphor (Sr,Mg)₃(PO₄)₂:Sn²⁺ for fluid temperature measurements

Cited by 24 publications

References 27 publications

The Application of Calcium Carbonate CaCO3 and Titania TiO2 for Color Homogeneity and Luminous Flux Enhancement in PC-LEDs

The Application of Calcium Carbonate CaCO3 and Titania TiO2 for Color Homogeneity and Luminous Flux Enhancement in PC-LEDs

Enhance the chromatic uniformity and luminous efficiency of WLEDs with triple-layer remote phosphor structures

The Impacts of Red-emitting Mg2TiO4:Mn4+ Phosphor on Color Quality of Dual-layer Remote Phosphor Configuration

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