Effective heat dissipation and geometric optimization in an LED module with aluminum nitride (AlN) insulation plate

Jeong, Minsu; Jeon, Seung Won; Lee, Sang Hun; Kim, Yongchan

doi:10.1016/j.applthermaleng.2014.11.027

Cited by 47 publications

(17 citation statements)

References 26 publications

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“…Additionally, the welding environment of the vacuum furnace is a vacuum, which effectively prevents the oxidation of the elements in the solder at high temperature and avoids the production of cracks at the solder joint. Therefore, the shearing force of the VFW group is higher than that of the DW group [20][21][22]. Figure 4 shows the box plot of the steady-state voltage of 10 FC-LED filaments after lighting 15 min.…”

Section: Shearing Force Scatter Diagram and Microstructure Of Fracturmentioning

confidence: 99%

Effect of Different Welding Methods on Flip-Chip LED (FC-LED) Filament Properties

Zou

et al. 2018

Applied Sciences

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This paper investigates the effect of two different welding methods, direct welding (DW) and vacuum furnace welding (VFW), on flip-chip light-emitting diode (FC-LED) filament properties. Shearing force, SEM, steady-state voltage, steady-state luminous flux, and change of photoelectric performance with aging time were employed to characterize the differences in filament properties between the two welding methods. The shearing test revealed that the average shearing force of the VFW group was higher than that of the DW group, but the two groups followed the standard. Furthermore, the microstructure of the VFW group fault was more smoother, and the voids were fewer and smaller based on the SEM test results. The steady-state voltage and luminous flux revealed that the VFW group had a more concentrated voltage and a higher luminous flux. The aging data revealed that the steady-state voltage change rate of both groups was not very different, and both luminous flux maintenance rates of the VFW group were higher than those of the DW group, but all were within the standard range. In conclusion, if there is a higher requirement for filament in a practical application, such as the filament is connected in series or in parallel and needs a higher luminous flux, it can be welded using vacuum furnace welding. If the focus is on production efficiency and the high performance of filaments is not required, direct welding can be used.

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Section: Shearing Force Scatter Diagram and Microstructure Of Fracturmentioning

confidence: 99%

Effect of Different Welding Methods on Flip-Chip LED (FC-LED) Filament Properties

Zou

et al. 2018

Applied Sciences

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“…Therefore, the two-phase flow apparatus have been mostly used to deal with the hot spot problem caused by high power LED. Moreover, the overall effective thermal conductivity of the new heat spreader is forty to one hundred times greater than that of the copper substrate [11][12][13][14]. The heat-dissipating ability of an LED lighting instrument affects its stability and quality in that unsatisfactory heat dissipation negatively impacts the lifespan of the lighting instrument.…”

Section: Introductionmentioning

confidence: 98%

Analyzing the structural designs and thermal performance of nonmetal lighting devices of LED bulbs

Wang

2016

International Journal of Heat and Mass Transfer

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“…The LED filament lamp was usually made up of chips, transparent substrate, and phosphors [3]. According to the development of substrate materials, LED filament lamps have undergone three generations from transparent ceramics, quartz glass to sapphire [4,5].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Helium Inflating on Heat Dissipation and Luminescence Properties of the A60 LED Filament Lamps

Chen

Zeng

et al. 2019

International Journal of Photoenergy

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LED filament lamp has the characteristics of nearly 360° lighting angle, high brightness, and low energy consumption, turning it gradually into the best substitute for traditional incandescent lamps. At present, due to the limitations of heat dissipation, the development of high-power LED filament lamp is restricted. Helium is a rare gas with small density and high heat transfer coefficient. It can be used as a cooling and protective gas for LED filament lamp. In this paper, we investigated the effects of helium on the heat dissipation and luminescence performance of the A60 LED filament lamps by detecting the changes of junction temperature, color temperature, and luminous flux of different ratios helium inflating in the different power A60 LED filament lamps. Through the experiment, we found the most cost-effective ratio of helium gas in the A60 LED filament lamps without improving the lamp size and the filament diameter.

show abstract

Effective heat dissipation and geometric optimization in an LED module with aluminum nitride (AlN) insulation plate

Cited by 47 publications

References 26 publications

Effect of Different Welding Methods on Flip-Chip LED (FC-LED) Filament Properties

Effect of Different Welding Methods on Flip-Chip LED (FC-LED) Filament Properties

Analyzing the structural designs and thermal performance of nonmetal lighting devices of LED bulbs

Optimization of Helium Inflating on Heat Dissipation and Luminescence Properties of the A60 LED Filament Lamps

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