Enhancement of color quality and luminous flux for remote-phosphor LEDs with red-emitting CaMgSi2O6:Eu2+,Mn2+

Luo, Guo‐Feng; Loan, Nguyen Thi Phuong; Tho, Le Van; Anh, Nguyen Doan Quoc; Lee, Hsiao-Yi

doi:10.2478/msp-2020-0045

Cited by 11 publications

(13 citation statements)

References 21 publications

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“…They can especially be served as an alternative solution to halogen, incandescent, and fluorescent illuminating systems since they are safer and sturdier. Researchers also pointed out that LEDs potentially have better energy conversion efficiency leading to less heat release, longer lifetime, and more stable brightness performance (Nguyen et al, 2021a;Luo et al, 2020). A LED package was conventionally fabricated utilizing the synthetic of a blue chip and a yellow phosphor material.…”

Section: Introductionmentioning

confidence: 99%

Selection of Multi-layer Remote Phosphor Structure for Heightened Chromaticity as well as Lumen Performance within WLED Devices

Dang¹,

Thi²

2022

IJTech

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The hue output for remote phosphor layout is still a concern for researchers and producers working on developing WLED devices since said layout proves inferior to the conformal or in-cup phosphor package. However, the luminous efficiency in the layout showed significant improvements. Thus, this study aims to achieve higher color quality accompanied by high lumen output for remote phosphor structures by using additional phosphor layers. Specifically, the study introduces the double-film and triple-film configurations in which the red and green phosphors were added. The best structure for WLED applications is determined by comparing these structures. The influences of each phosphor structure are investigated and examined on optical parameters of WLEDs, which have different correlated hue temperatures between 5600 K and 8500 K. The optical features are CRI, CQS, color deviation (CD), and photoluminescence (PL). The results demonstrate that the triple-layer structure improved the color quality more effectively than the dual-layer structure due to higher attained CRI and CQS and smaller DC figures. The hypothesis of Miescattering indicates that the enhancement of scattering in the triple-layer is responsible for these achievements. Thus, the findings of this study are reliable and valuable for manufacturers.

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Section: Introductionmentioning

confidence: 99%

Selection of Multi-layer Remote Phosphor Structure for Heightened Chromaticity as well as Lumen Performance within WLED Devices

Dang¹,

Thi²

2022

IJTech

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“…With the presence of these QDs, it is possible to generate white illuminations with adjustable CCTs when the R a values are from 96 to 97, and LLE values are from 243 lm/W to 254 lm/W, under the CCT range of 2700-6500 K [9]. A study suggested a R/Y/C WLED package, in which the combination of the red AlGaInP LED, the pc-Y LED, and pc-C LED devices were demonstrated, for the white-illuminating generation with adjustable CCTs through several R a , R 9 , and LLE values under two CCT ranges of 2700-6500 K and 2731-6533 K [10]. In that work, pc-Y LED and pc-C LED parts utilized blue InGaN LED dyes, but the phosphors were different.…”

Section: Introductionmentioning

confidence: 99%

Studying CdS:In green phosphor's impacts on white-light emitting diode with higher luminous flux

Dang

Thai

2022

Materials Science-Poland

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A lumen efficiency (LE) simulation model with the Monte Carlo method is introduced to the white-light-emitting diode devices that utilize the red LED (light-emitting diode) dyes instead of red-emitting phosphors (R-WLEDs). By simulating this model, the desirable spectrum-related indices and photometric efficiencies, which are adequate for superior chromatic consistency (or R f > 97), can be accomplished for R-WLEDs under the correlated color temperature (CCT) range of 5000–8000 K. The structure of the R-LED has LEDs in red and blue colors (650 nm and 448 nm) combined with phosphors possessing yellow and green emissions (586 nm and 507 nm). In comparison with pc-WLEDs (WLEDs operating with conversion phosphors) and QD-WLEDs (WLED devices with quantum dots), pc/R-WLED devices could present its outperformance to the others and become a promising way to achieve remarkable chromatic generation, particularly under the condition of small color temperature limit, and act as a substitute for the pc-WLED devices.

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“…Moreover, pc-LED products provide considerable energy-consumption reduction, lower maintenance costs, high resistance, long-life performance, and limitation of carbon and UV emissions [3]. Thus, LED has been gradually cementing its position in solid-state lighting (SSL) [4].…”

Section: Introductionmentioning

confidence: 99%

Comparison between SEPs of CaCO₃ and TiO₂ in phosphor layer for better color uniformity and stable luminous flux of WLEDs with 7,000 K

Trang

Anh

et al. 2022

Materials Science-Poland

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CaCO3 and TiO2 are proposed in this study as particles for scattering enhancement (SEPs) of phosphor-converted white light-emitting diodes (pc-WLEDs). The use of these two SEPs for scattering improvement enables boosting of the color homogeneity of the WLED devices. Each SEP is mixed with YAG:Ce3+ and silicone composition to examine their optical influences and performances on the high-power WLED packages with 7,000 K color temperature (CT). Miescattering theory is applied to calculate and investigate the scattering elements – scattering coefficients, anisotropic scattering, the reduced scattering, and scattering amplitudes – at the wavelengths of 450 nm and 550 nm. The results exhibit that TiO2 and CaCO3 considerably promote higher color uniformity and color-deviated reduction, respectively. The obtained results could be primarily attributed to the significant improvement in the scattering properties of the structure. Additionally, the effects of the presented scattering enhancement on luminous efficiency are displayed. The reduction in lumen output is observed to have a close connection with the concentration and particle size of TiO2 and CaCO3, which means that control must be exercised over these factors when utilizing these SEPs for WLED fabrication.

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Enhancement of color quality and luminous flux for remote-phosphor LEDs with red-emitting CaMgSi₂O₆:Eu²⁺,Mn²⁺

Cited by 11 publications

References 21 publications

Selection of Multi-layer Remote Phosphor Structure for Heightened Chromaticity as well as Lumen Performance within WLED Devices

Selection of Multi-layer Remote Phosphor Structure for Heightened Chromaticity as well as Lumen Performance within WLED Devices

Studying CdS:In green phosphor's impacts on white-light emitting diode with higher luminous flux

Comparison between SEPs of CaCO₃ and TiO₂ in phosphor layer for better color uniformity and stable luminous flux of WLEDs with 7,000 K

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Enhancement of color quality and luminous flux for remote-phosphor LEDs with red-emitting CaMgSi2O6:Eu2+,Mn2+

Cited by 11 publications

References 21 publications

Selection of Multi-layer Remote Phosphor Structure for Heightened Chromaticity as well as Lumen Performance within WLED Devices

Selection of Multi-layer Remote Phosphor Structure for Heightened Chromaticity as well as Lumen Performance within WLED Devices

Studying CdS:In green phosphor's impacts on white-light emitting diode with higher luminous flux

Comparison between SEPs of CaCO3 and TiO2 in phosphor layer for better color uniformity and stable luminous flux of WLEDs with 7,000 K

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Product

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Enhancement of color quality and luminous flux for remote-phosphor LEDs with red-emitting CaMgSi₂O₆:Eu²⁺,Mn²⁺

Comparison between SEPs of CaCO₃ and TiO₂ in phosphor layer for better color uniformity and stable luminous flux of WLEDs with 7,000 K