Optical Properties as Process Condition of Color Conversion Lens Using Low-softening Point Glass for White LED

채유진,; 이미재,; 황종희,; 임태영,; 김진호,; 정희석,; 이영식,; 김득중,

doi:10.4191/kcers.2013.50.6.454

Cited by 4 publications

(5 citation statements)

References 13 publications

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“…When PiG films with various thicknesses were fabricated with the fixed GtP ratio of 6:4, varying the number of screen printing, color coordination of the mounted LED also linearly moved to yellow as thickness increased due to the increased phosphor content and optical path (Figure ) demonstrating a wLED with the PiG film thickness of ~50 μm. However, similar to previous reports which only used yellow phosphor for the PiG thick film, the lack of red emission restricts the color temperature above 4200 K and hinders the realization of a warm wLED.…”

Section: Cri Cct Efficacy and Thickness Of Pig Thick Films With Vasupporting

confidence: 67%

“…The improved thermal stability of the PiG plates in comparison to those prepared with commercial silicon resin was confirmed by measuring the thermal quenching property, which had not previously been properly addressed for PiG thick films . The inset in Figure shows the thermal quenching property of the present thick films, which was recorded with relative PL intensity for varying temperatures.…”

Section: Cri Cct Efficacy and Thickness Of Pig Thick Films With Vamentioning

confidence: 70%

“…In film form, however, PiG does not require postprocessing and can be applied to various surfaces providing high versatility in design and pattern formation. These advantageous features and the versatility of the screen printing method used to fabricate it increase the feasibility of using PiG in applications . Chae et al .…”

Section: Cri Cct Efficacy and Thickness Of Pig Thick Films With Vamentioning

confidence: 99%

“…These advantageous features and the versatility of the screen printing method used to fabricate it increase the feasibility of using PiG in applications . Chae et al . and Yang et al .…”

Section: Cri Cct Efficacy and Thickness Of Pig Thick Films With Vamentioning

confidence: 99%

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Phosphor‐in‐glass thick film formation with low sintering temperature phosphosilicate glass for robust white LED

et al. 2017

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Phosphor-in-glass (PiG) thick film was fabricated on a borosilicate glass substrate using a conventional screen printing method and employing phosphosilicate glass to allow low-temperature sintering. The vehicle content and sintering temperature were optimized to form a thick film with a thickness of~50 lm. Commercial yellow (Y 3 Al 5 O 12 :Ce 3+ ) and red (CaAlSiN 3 :Eu 2+ ) phosphors were successfully incorporated within the glass matrix and then sintered at 550°C. Color-tunable white LEDs were achieved using the PiG thick films as a color converter by varying the glass to phosphor (GtP) ratio. The high luminous efficacy of up tõ 120 lm/W and high color rendering index of up to 89 in combination with the thermal quenching property prove the practical feasibility of the PiG thick films for high-power/high-brightness LED applications. K E Y W O R D S glass, luminescence, phosphors, thick films

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Section: Cri Cct Efficacy and Thickness Of Pig Thick Films With Vasupporting

confidence: 67%

Section: Cri Cct Efficacy and Thickness Of Pig Thick Films With Vamentioning

confidence: 70%

Section: Cri Cct Efficacy and Thickness Of Pig Thick Films With Vamentioning

confidence: 99%

“…These advantageous features and the versatility of the screen printing method used to fabricate it increase the feasibility of using PiG in applications . Chae et al . and Yang et al .…”

Section: Cri Cct Efficacy and Thickness Of Pig Thick Films With Vamentioning

confidence: 99%

See 2 more Smart Citations

Phosphor‐in‐glass thick film formation with low sintering temperature phosphosilicate glass for robust white LED

et al. 2017

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“…Chae et al 141 and Yang et al 142 demonstrated that PiG can also be fabricated in a thick film on a glass substrate using a screen printing process. Thick film does not need an additional polishing process and it is relatively easy to fabricate various shapes by simply changing the screen design.…”

Section: Fabrication Methods Of Pigmentioning

confidence: 99%

Review—A Review on Phosphor in Glass as a High Power LED Color Converter

Chung

Nam

2019

ECS J. Solid State Sci. Technol.

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Phosphor-in-glass (PiG) is a mixture of a transparent glass and ceramic phosphors and has been recently commercialized for its various advantages as an inorganic color converter for white light emitting diodes (wLEDs). Since the successful demonstration of the wLED and its improved stability over the conventional phosphors in silicon or organic resins, extensive studies have been reported to improve its color conversion and resultant LED properties, such as luminescence efficacy, chromaticity, correlated color temperature and color gamut, as well as its long term stability. Various attempts have also been made to fabricate a PiG structure and to extend its applications. This study reviews the recent progress of PiG and discusses various approaches that have been proposed to overcome the technical issues related to PiG.

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Effect of Heat Treatment Temperature and Coating Thickness on Conversion Lens for White LED

Lee¹,

Hwang²,

Lim³

et al. 2014

Journal of the Korean Ceramic Society

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Today, silicon and epoxy resin are used as materials of conversion lenses for white LEDs on the basis of their good bonding and transparency in LED packages. But these materials give rise to long-term performance problems such as reaction with water, yellowing transition, and shrinkage by heat. These problems are major factors underlying performance deterioration of LEDs. In this study, in order to address these problems, we fabricated a conversion lenses using glass, which has good chemical durability and is stable to heat. The fabricated conversion lenses were applied to a remote phosphor type. In this experiment, the conversion lens for white LED was coated on a glass substrate by a screen printing method using paste. The thickness of the coated conversion lens was controlled during 2 or 3 iterations of coating. The conversion lens fabricated under high heat treatment temperature and with a thin coating showed higher luminance efficiency and CCT closer to white light than fabricated lenses under low heat treatment temperature or a thick coating. The conversion lens with 32 µm coating thickness showed the best optical properties: the measured values of the CCT, CRI, and luminance efficiency were 4468 K, 68, and 142.22 lm/w in 20 wt% glass frit, 80 wt% phosphor with sintering at 800 o C.

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Optical Properties as Process Condition of Color Conversion Lens Using Low-softening Point Glass for White LED

Cited by 4 publications

References 13 publications

Phosphor‐in‐glass thick film formation with low sintering temperature phosphosilicate glass for robust white LED

Phosphor‐in‐glass thick film formation with low sintering temperature phosphosilicate glass for robust white LED

Review—A Review on Phosphor in Glass as a High Power LED Color Converter

Effect of Heat Treatment Temperature and Coating Thickness on Conversion Lens for White LED

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