Cooling performance enhancement of LED (Light Emitting Diode) using nano-pastes for energy conversion application

Chang Min Kim, Yong Tae Kang

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

LED (Light Emitting Diode) has been expected as the next generation of lighting system due to its high efficiency. However, the hot spot problem of the LED is very critical for its lifetime and efficiency. TIMs (Thermal Interface Materials) have been used to enhance the cooling performance of the LED. However its thermal conductivity is not high enough to overcome the hot spot problem. In this study, nano-pastes are made by adding CNT (carbon nanotube) and graphene to the thermal grease to enhance the heat dissipation. It is found that the thermal conductivities of CNT grease and graphene grease enhance up to 16% and 6% at 0.75wt% of the nanoparticles, respectively, compared with the pure thermal grease. The cooling performances of the LED package with applied CNT paste and graphene paste are enhanced by reducing the LED chip temperature 7.5°C and 5.5°C at 0.75wt% of nanoparticles, respectively. It is also found that the nano-paste materials help the enhancement of heat spreading to remove the hot spot problem.

Original languageEnglish
Pages (from-to)468-476
Number of pages9
JournalEnergy
Volume76
DOIs
Publication statusPublished - 2014 Nov 1

Fingerprint

Energy conversion
Light emitting diodes
Lubricating greases
Cooling
Graphene
Carbon nanotubes
Thermal conductivity
Nanoparticles
Heat losses
Lighting
Hot Temperature
Temperature

Keywords

  • Cooling performance
  • Energy conversion
  • Light Emitting Diode
  • Nano-pastes

ASJC Scopus subject areas

  • Pollution
  • Energy(all)

Cite this

Cooling performance enhancement of LED (Light Emitting Diode) using nano-pastes for energy conversion application. / Kim, Chang Min; Kang, Yong Tae.

In: Energy, Vol. 76, 01.11.2014, p. 468-476.

Research output: Contribution to journalArticle

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AB - LED (Light Emitting Diode) has been expected as the next generation of lighting system due to its high efficiency. However, the hot spot problem of the LED is very critical for its lifetime and efficiency. TIMs (Thermal Interface Materials) have been used to enhance the cooling performance of the LED. However its thermal conductivity is not high enough to overcome the hot spot problem. In this study, nano-pastes are made by adding CNT (carbon nanotube) and graphene to the thermal grease to enhance the heat dissipation. It is found that the thermal conductivities of CNT grease and graphene grease enhance up to 16% and 6% at 0.75wt% of the nanoparticles, respectively, compared with the pure thermal grease. The cooling performances of the LED package with applied CNT paste and graphene paste are enhanced by reducing the LED chip temperature 7.5°C and 5.5°C at 0.75wt% of nanoparticles, respectively. It is also found that the nano-paste materials help the enhancement of heat spreading to remove the hot spot problem.

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