Pixelated phosphors for high-resolution and high-contrast white light sources

Steudel, Franziska; Lisec, T.; Nolte, Peter W.; Hofmann, Ulrich; Wantoch, Thomas von; Lofink, Fabian; Schweizer, Stefan

doi:10.1364/oe.26.026134

Cited by 13 publications

(12 citation statements)

References 11 publications

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“…This makes the difference in scattering properties in WLEDs, resulting in differences in optical properties. In Figure 2, it is easy to see that the highest yellowemitting YAG:Ce 3+ phosphor concentration is in the Y Based on the results of the previous studies [8][9][10][11][12][13][14], the diameter of phosphor particles is…”

Section: Simulationmentioning

confidence: 97%

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Selecting a Suitable Remote Phosphor Configuration for Improving Color Quality of White Led

Lee¹,

Le²,

Anh³

2019

J. ADV. ENG. COMPUT.

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When compared with two conformal phosphor and in-cup phosphor structures, the remote phosphor structure has higher luminescent performance. However, it is difficult to control the color quality of the remote phosphor structure, so it has become a research target in recent years. So far, there are two remote phosphor structures used to improve color quality including dual-layer phosphor configuration and triple-layer phosphor configuration. This study suggests using those two configurations to make multi-chip white LEDs (WLEDs) that can achieve adequate values in color rendering index (CRI), color quality scale (CQS), luminous efficacy (LE) and color uniformity. WLEDs with a color temperature of 5600 K are applied. Research results show that the triple-layer phosphor configuration is superior in CRI, CQS, LE. Besides, the color deviation decreases significantly, meaning that the color homogeneity increases with the triple-layer phosphor configuration. This can be demonstrated by analyzing the scattering characteristics of phosphor classes through Mie theory, thus making the research results more reliable and valuable for producing quality WLEDs. 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: Simulationmentioning

confidence: 97%

“…The enhanced light extraction internal reection structure, which uses a polymer hemispherical shell lens with an interior phosphor coating, is known to increase extraction eciency [11]. Furthermore, an air-gap embedded structure can enhance luminous eciency by reecting downward light [12]. Obviously, in addition to luminous e-…”

Section: Introductionmentioning

confidence: 99%

Selecting a Suitable Remote Phosphor Configuration for Improving Color Quality of White Led

Lee¹,

Le²,

Anh³

2019

J. ADV. ENG. COMPUT.

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“…Also, in regards to the magnification of color homogeneity, the addition of CaCO 3 up to 10% can produce a considerable increase in this property [14]. Moreover, SiO 2 particle is a special SEP that can provide a control over color uniformity when applied to the phosphor layer of pc-LEDs, boost the color quality when placed in a suitable in the phosphor-silicone compound, and adjust the color temperature by changing the particles size [15]. The results all pointed out that SEPs are good for the development of pc-LED, yet which SEP is the best is still in question.…”

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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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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“…The color rendering index CRI is a quantitative measure of light quality compared to the natural light or black-body radiation. Thus, when CRI has a high value this means the applied phosphor has a broad emission spectrum which helps to better the light quality for LEDs light, similar to the continuous spectrum of the black-body radiation [4][5][6]. With the goal of customizing the chromaticity and CRI for LED lamps, many reports with the topics of combining phosphors with  ISSN: 2088-8708 Int J Elec & Comp Eng, Vol.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the CRI and lumen output for the 6600 K WLED with convex-dual-layer remote phosphor geometry by applying red-emitting MGSR3SI2O8:EU2+,MN2+ phosphor

Bui¹,

Loan²,

Le³

et al. 2020

IJECE

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The traditional white LED product established with a single chip and a single phosphor results in a low color rendering index (CRI). The upgrade of LED package is comprised of two chips and one phosphor material and gives the higher CRI while keeping high luminous efficiency. Based on previous findings, the research paper performs the application of the two chips and two phosphors to enhance the color tunability of LEDs with different amounts and intensities of the two employed phosphors. Additionally, a color design model is built to serve the purpose of bettering the color fine-tuning of the white-light LED module. The maximum value of the difference between the measured CIE 1931 color coordinates and that of the simulated model is approximately 0.0063 around the 6600 K correlated color temperature (CCT). From the results, this study offers a quick approach to achieve the color fine tuning of a white-light LED module with a high CRI and luminous efficiency.

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Pixelated phosphors for high-resolution and high-contrast white light sources

Cited by 13 publications

References 11 publications

Selecting a Suitable Remote Phosphor Configuration for Improving Color Quality of White Led

Selecting a Suitable Remote Phosphor Configuration for Improving Color Quality of White Led

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

Enhancing the CRI and lumen output for the 6600 K WLED with convex-dual-layer remote phosphor geometry by applying red-emitting MGSR3SI2O8:EU2+,MN2+ phosphor

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