Experimental investigation of heat transfer characteristics of the LED module using passive heat sinks

Padinhateeri, Ranjith; Manimaran, A.; Praveen, Ayyappan Susila; Ramesh, T.

doi:10.1080/01430750.2018.1507934

Cited by 6 publications

(3 citation statements)

References 4 publications

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“…The researchers found that only 20% of the total energy is converted into light output, and the rest is wasted in the form of heat. 49,50 The accumulation of waste heat causes many heat-related issues like reduction in optical efficiency, wavelength drift, malfunctioning, and a drastic reduction in the overall service life of the LED. Modern LEDs have reached up to 80–100 W/cm 2 of heat fluxes, leading to hotspot conditions under conventional cooling methods.…”

Section: Applications Of a Vapour Chambermentioning

confidence: 99%

Deployment of vapour chambers for electronic heat dissipation: state-of-the-art

Chitnis

Dayal

Arora

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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Miniaturization and high performance are the two principal requirements of modern electronics. All commercial applications demand reliable performance at high operational efficiency for prolonged service life. In order to meet all these requirements, the cooling system should be able to handle large heat fluxes packed in compact spaces and take away the heat as soon as possible to avoid overheating of the chip. Phase change heat transfer devices can handle large heat fluxes on account of latent heating. Lately, vapour chambers (VCs) are found to be promising heat spreaders as they are passive two-phase heat transfer devices. They effectively eliminate the hotspots, transferring high heat fluxes with better efficiencies and offer lower thermal resistance compared to the conventional cooling techniques. A detailed review of the latest research and advancements in the field of VCs is presented in this paper, including the effect of different thermo-physical parameters on their performance. Finally, all the major findings are summarized, including the future scope of development in a systematic manner.

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Section: Applications Of a Vapour Chambermentioning

confidence: 99%

Deployment of vapour chambers for electronic heat dissipation: state-of-the-art

Chitnis

Dayal

Arora

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…To analyze the transiting energy of the electrons within CaLa:EM phosphor geometry, the crystal field splitting is accessed. Crystal field splitting (Dq) will be demonstrated via the following expression [18]. Additionally, in (1), the Dq is carried out through Königs et al [19] as well as Tsai et al [20].…”

Section: Characterization Of Phosphormentioning

confidence: 99%

Ca9La(PO4)7:Eu2+,Mn2+: a radiation-adjustable phosphor usable for high-perfomance white light-emitting diodes

Huu

That

et al. 2022

IJEECS

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We used solid-condition processes to make a sequence of radiation-adjustable phosphors Eu2+/Mn2+ co-doped Ca9La(PO4)7 (shortened as CaLa:EM), which show a consistently variable hue from green to yellow and red via an efficient resonance-form energy transition as well as the strength of green and red radiations may be controllable through altering the Mn2+concentration. We examined the transition of energy (Eu2+®Mn2+) for CaLa:EM. It is proved to be a resonant kind using a dipole-quadrupole process, having power shift critical range calculated to be 11.36 Å by using the spectral overlap techniques. Mixing a 365 nm UV-InGaN chip as well as one phosphor combination containing (Ca0.98Eu0.005Mn0.015)9La(PO4)7 in yellow with BaMgAl10O17:Eu2+in blue produced a warming WLED having CIE color coordinates measured at (0.35, 0.31), better CRI value (Ra)measured at 91.5 along with smaller CCT value of 4,496 K.

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“…As such, the task of augmenting phosphors' heat abatement attributes remains particularly difficult when it comes to creating WLED devices based on conversion phosphor. Back to previous eras, various studies were carried out to assess dial molybdates incorporated with rare-earth ions having composition shown as MLn(MoO4)2 (with M being Li + , Na + and Ln being La 3+ , Gd 3+ , Lu 3+ , Y 3+ ) in the form of inorganic substances, garnering significant notice as they can be diversely utilized for solid-state lasers, scintillators as well as WLED devices (Ranjith et al, 2020;Soltic et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Improved Color Uniformity In White Light-Emitting Diodes Using LiLu(MoO4)2:Sm3+ Combined SiO2 Composite

Tung,

Thi,

Anh

2024

IJTech

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The research herein concerns the composite of red phosphor of LiLu(MoO4)2:Sm 3+ (LMOS), yellow phosphor YAG:Ce 3+ , SiO2 particles, and silicone gel. The LMOS phosphor is created via the sol-gel procedure and supposed to yields significant heat consistency. The concentration of this LMOS phosphor is fixed at around 10 wt.% and the concentration of SiO2 particles is modifed. This is to influence the scattering performance of the composite to achieve the better color distribution. After sample creation, we analyzed the luminescence of the LMOS in the composite and the effects of the composite with different SiO2 dosages on the commercial light-emitting diode (LED). When excited via 405-nm ultraviolet, the samples generate red ray under 648 nm matching the shift between 4 G5/2 and 6 H9/2 for the ion of Sm 3+ . With high SiO2 amounts, the color difference is reduced, and the luminosity is enhanced. The correlated color temperature is also lower, resulting in a warmer white light for the packed LED. However, the color rendering index declines, which could be attributed to the green and blue color deficiency while the red color is dominant. From the tested outcomes, LiLu(MoO4)2:Sm 3+ @SiO2 composite is validated to be effective at improving chromatic uniformity for white-ray diodes.

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Experimental investigation of heat transfer characteristics of the LED module using passive heat sinks

Cited by 6 publications

References 4 publications

Deployment of vapour chambers for electronic heat dissipation: state-of-the-art

Deployment of vapour chambers for electronic heat dissipation: state-of-the-art

Ca9La(PO4)7:Eu2+,Mn2+: a radiation-adjustable phosphor usable for high-perfomance white light-emitting diodes

Improved Color Uniformity In White Light-Emitting Diodes Using LiLu(MoO4)2:Sm3+ Combined SiO2 Composite

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