A Cylindrical Tuber Encapsulant Geometry for Enhancing Optical Performance of Chip-on-Board Packaging Light-Emitting Diodes

Yu, Xingjian; Xie, Bin; Shang, Bofeng; Chen, Qi; Luo, Xiaobing

doi:10.1109/jphot.2016.2555619

Cited by 31 publications

(7 citation statements)

References 16 publications

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“…对于阵列LED模块. Zhang和 Lee [130] 通过在基板上加工微槽来限制封装胶的流动, 从而得到和基板之间具有较大接触角的晶圆级荧光粉涂覆方法; Yu等人 [131] [117,118,134,135] . 针对于扩展光源, Munon等人 [137] 和Benitez等人 [138] 于2004年提出多曲面同时设计法 ( [154] .…”

Section: 理论上光子晶体可以将芯片的出光效率提高到90%以unclassified

LED packaging for high light quality: Status and perspectives

Yu¹,

Shu²,

Hu³

et al. 2017

Sci. Sin.-Tech.

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Section: 理论上光子晶体可以将芯片的出光效率提高到90%以unclassified

LED packaging for high light quality: Status and perspectives

Yu¹,

Shu²,

Hu³

et al. 2017

Sci. Sin.-Tech.

Self Cite

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“…High thermal conductive materials and high thermal conductive gases are chosen to decrease the average junction temperature of the LED filament [15,22,23]. To increase the flow of gas inside the bulb, Xu [24] et al used ionic wind to improve the heat dissipation ability of LED filament bulb.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Different Filament Arrangements on Thermal and Optical Performances of LED Bulbs

et al. 2020

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The influences on thermal and optical performances of light emitting diode (LED) bulbs with three different filament arrangements are investigated in detail. The average junction temperature, temperature of the surface of the bulb, and luminous flux of three samples all increased with increasing power. The thermal performance test results show that between the average junction, temperature and power were linear. The junction temperatures of the three samples at a power of 3.5 W were 102.48, 98.46, and 88.88 • C. The optical performance test results revealed that the luminous flux and efficiency in the two vertical filament arrangements were closely related to each other and higher than that of the horizontal filament arrangement. A numerical model of LED filament bulbs was established by the Floefd 17.2 software for analyzing the temperature distribution of the cross section and the gas flow path inside the bulb. The simulation results illustrated that the average temperatures of three samples were 105.88, 101.83, and 96.12 • C. Additionally, the gas flow inside the bulb of the two vertical filament arrangements was subject to forming a thermal cycle during operation work more than that of the horizontal filament arrangement. As a result, the flexible spiral LED filament bulb is feasible as a new light source.

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“…In recent years, LEDs are replacing conventional incandescent lamps due to several well-known advantages, such as color-tunable property, long lifespan, compact size, and high luminous efficacy among others [4], [5]. However, there still exist many serious problems in LEDs which can not be completely addressed [6], [7]. For example, LEDs generally exhibit a decrease in the power efficiency at high current densities, so-called as the efficiency droop [8], which hinders the rapid development and application of solid-state lighting.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Circadian Action and Color Quality in Laser-Based Illuminant for General Lighting and Display

et al. 2020

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In this work, the genetic algorithm is employed to optimize both circadian action factor (CAF) and color quality of laser-based illuminants (LBIs) with three, four, and five spectral bands to disclose its possible use in two common white lighting applications, i.e. bedroom lighting and office lighting. Comparing all LBIs at a correlated color temperature (CCT) of 3000 K and a color rendering index of 80, the CAF of four-band LBIs reaches a minimum of 0.238 and maintains at a possibly highest luminous efficacy of radiation (LER) of 422 lm/W among all cases. The performances of white LBIs are also compared with those of white light-emitting diodes (LEDs). The results demonstrate that, under the same conditions of color rendering and color temperature, both four-band LBIs and four-band LEDs exhibit the largest circadian tunability of about 4.7, while four-band LBIs possess much higher LER at the same time compared with four-band LEDs. In addition, for the display application, the investigation on the optimal circadian tunability as a function of color gamut at two CCTs (3000 K and 6500 K) is also performed. We believe that this study can serve as a useful guidance for the application of LBIs in both the healthy general lighting and display.

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A Cylindrical Tuber Encapsulant Geometry for Enhancing Optical Performance of Chip-on-Board Packaging Light-Emitting Diodes

Cited by 31 publications

References 16 publications

LED packaging for high light quality: Status and perspectives

LED packaging for high light quality: Status and perspectives

The Effect of Different Filament Arrangements on Thermal and Optical Performances of LED Bulbs

Investigation on Circadian Action and Color Quality in Laser-Based Illuminant for General Lighting and Display

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