Development of high luminous efficacy red-emitting phosphor-in-glass for high-power LED lighting systems using our original low Tg and Ts glass

Park, Young Ji; Jeong, Gyu Jin; Kim, Jin Ho; Lee, Youngjin; Kim, Sun Woog; Kim, Cheol Jin; Hwang, Jonghee

doi:10.1364/ol.44.006057

Cited by 18 publications

(12 citation statements)

References 30 publications

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“…If the two solutions are successfully combined, the LED package with GaN growth on the patterned sapphire substrate (PSS) can present 60% increase in lumen performance [13]. In particular, the slant patterns' surfaces in the PSS divert TDs sideways and thus, decreasing TDs density directed at the surface, and boost the IQE [14]. Moreover, these PSS patterns' slanted sides expand the angle of radiation transmission and lower the impact of TIR.…”

Section: Introductionmentioning

confidence: 99%

Decreasing CCT deviation of white light emitting diodes by employing SiO2 nanoparticles

Thi

That

2021

Bulletin EEI

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In this research, the SiO2 nano-particles (NPs) usage in enhancing optical performances of InGaN/GaN-based white light-emitting diodes (WLEDs) with remote phosphor structure. The research subject shows better lighting capacity than the white LEDs devices without the space between the layers. The adjustment in development process resulted in enhancements of internal quantum efficiency (IQE) and light extraction efficiency (LEE) that lead to 13.5% luminous efficacy improvement. From the experiments, it can be concluded that the LEE is affected by the trapped light and enhancing the light output with SiO2 scattering properties reduce the amount of trapped light. These results confirm that SiO2 nano-particles is effective in enhancing the optical performance of WLEDs and can be considered for production of higher quality devices.

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Section: Introductionmentioning

confidence: 99%

Decreasing CCT deviation of white light emitting diodes by employing SiO2 nanoparticles

Thi

That

2021

Bulletin EEI

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“…The color rendering index (CRI) is a basic factor for evaluating the light quality of a LED light source in examination with regular daylight or black body radiation. A high CRI indicates the wide outflow range of a phosphor, which is like the persistent range of black body radiation [6][7][8]. A few strategies are accessible to get white light by blending LEDs and phosphors.…”

Section: Introductionmentioning

confidence: 99%

Y2O3:Ho3+ and ZnO:Bi3+: a selection for enhancing color quality and luminous flux of WLEDs

Loan

Anh

2020

IJECE

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As the luminescence industry develops, the white light light-emitting diode (LED) package with a single chip and a single phosphor although produces good luminous flux but has a poor color rendering index (CRI) can no longer fulfill the requirements of modern lighting applications. Therefore, this research is conducted to response to the urgent demands of improving other lighting qualities of WLED while maintaining high luminous efficiency. To achieve this target, we applied the new WLED package, which contains multi-chips and multi-phosphor layers, and have obtained outstanding results in both CRI and luminous efficacy. Two types of phosphor used in the WLED package are Y2O3:Ho3+ and ZnO:Bi3+. A color configuration model is also developed to adjust the shading of the white-light LED module. The results of this research show that the triple-layer phosphorhas the best performance when applied in a white-light LED package, which is demonstrated through better color quality, CRI and luminous efficacy, The manufacturers can rely on this research to produce the optimal-quality WLED, or WLED that is appropriate to their quality demands.

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“…In addition, the combination of yellow YAG:Ce 3+ phosphor with the silicone substance could support the blue light and yellow light extraction [9][10][11][12] and also generate the white light. This process includes two stages: disintegrating in phosphor compounds and moving through phosphor particles, in which the YAG:Ce 3+ phosphor layer will metabolize the blue light and simultaneously make it become weaker [13][14][15][16]. However, the converted yellow light tends to be more intense after every scattering, which makes the normal extracted light from the WLED to be more blue, while if it is placed near the LED exterior, the color tend to be more yellow [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

SrBaSiO4:Eu2+ phosphor: a novel application for improving the luminous flux and color quality of multi-chip white LED lamps

Loan¹,

Anh²

2020

IJECE

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This paper described in detail the chromatic homogeneity and luminous flux influences in producing better quality white LED devices with various phosphor layers (MCW-LEDs). The method is to let Eu2+-activated strontium–barium silicate (SrBaSiO4:Eu2+) mixed with their phosphor compounding, which results in notable impact on lighting performance. The increase in concentration of yellow-green-emitting SrBaSiO4:Eu2+ phosphor also promotes the color performance and lumen output of WLED devices at high correlated color temperature around 8500K. This is the first time this approach is applied and it results can be utilized for better understanding of optical properties interaction with phosphor materials. Although SrBaSiO4:Eu2+ receives many positive responses, we still need to limit it concentration for high SrBaSiO4:Eu2+ concentration is detrimental to CQS. The appropriate choice of concentration and size of SrBaSiO4:Eu2+ is the principal factor to decide the performance of MCW-LEDs.

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Development of high luminous efficacy red-emitting phosphor-in-glass for high-power LED lighting systems using our original low Tg and Ts glass

Cited by 18 publications

References 30 publications

Decreasing CCT deviation of white light emitting diodes by employing SiO2 nanoparticles

Decreasing CCT deviation of white light emitting diodes by employing SiO2 nanoparticles

Y2O3:Ho3+ and ZnO:Bi3+: a selection for enhancing color quality and luminous flux of WLEDs

SrBaSiO4:Eu2+ phosphor: a novel application for improving the luminous flux and color quality of multi-chip white LED lamps

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