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How Much Does Heat Dissipation Affect High-brightness LEDs?

  • Categories:Industry News
  • Author:Ways Yi
  • Origin:
  • Time of issue:2020-07-14 09:41
  • Views:

(Summary description)Due to the global energy shortage and environmental pollution situation, the application of LED lighting products in the field of lighting are attracting the world's attention. In general, whether the LED lighting fixtures work stably and the quality is good or not, and the heat dissipation is very important. At present, the heat dissipation of high-brightness LED products on the market adopt natural heat dissipation, and the effect is not ideal. LED lighting product is made of LED chips, heat dissipation structures, drivers, and lenses. Heat dissipation is a very important part. If the LED cannot dissipate heat well, the lifetime will reduce a lot.

How Much Does Heat Dissipation Affect High-brightness LEDs?

(Summary description)Due to the global energy shortage and environmental pollution situation, the application of LED lighting products in the field of lighting are attracting the world's attention. In general, whether the LED lighting fixtures work stably and the quality is good or not, and the heat dissipation is very important. At present, the heat dissipation of high-brightness LED products on the market adopt natural heat dissipation, and the effect is not ideal. LED lighting product is made of LED chips, heat dissipation structures, drivers, and lenses. Heat dissipation is a very important part. If the LED cannot dissipate heat well, the lifetime will reduce a lot.

  • Categories:Industry News
  • Author:Ways Yi
  • Origin:
  • Time of issue:2020-07-14 09:41
  • Views:
Information

Due to the global energy shortage and environmental pollution situation, the application of LED lighting products in the field of lighting are attracting the world's attention. In general, whether the LED lighting fixtures work stably and the quality is good or not, and the heat dissipation is very important. At present, the heat dissipation of high-brightness LED products on the market adopt natural heat dissipation, and the effect is not ideal. LED lighting product is made of LED chips, heat dissipation structures, drivers, and lenses. Heat dissipation is a very important part. If the LED cannot dissipate heat well, the lifetime will reduce a lot.

 

        1.Thermal management is the major problem in high-brightness LED applications.

Because the p-type doping of group III nitrides is limited by the solubility of the Mg acceptor and the higher activation energy of the holes, the heat is particularly to be generated in the p-type region, and this heat must be conducted to the heat sink through the entire structure. The main heat dissipation of LED devices is conduction and convection, the extremely low thermal conductivity of Sapphire substrate materials leads to an increase of thermal resistance of the device, which will generate a serious self-heating effect, and it will bring a devastating effect on the performance and reliability.

 

       2.Influence of heat on high-brightness LED

The heat is concentrated in a LED chip with a tiny size. The chip temperature rises will cause a non-uniform distribution of thermal stress, and the drop of the chip luminous efficiency and phosphor lasing efficiency. When the temperature exceeds a certain value, the device failure rate increases exponentially. There are some statistics show that while the component temperature rises by 2°C, the reliability drops by 10%. When multiple LEDs are densely arranged to build a white light illumination system, the problem of heat dissipation is more serious. Thus, solving thermal management problems has become a prerequisite for high-brightness LED lighting applications.

 

      3.The relationship between LED chip size and heat dissipation

The most direct way to increase the brightness of the power LED lighting fixtures is to increase the input power, and in order to prevent the saturation of the active layer, the size of the PN junction must be correspondingly increased. At the same time, increasing the input power will inevitably increase the junction temperature, and thus the quantum efficiency will be reduced.

 

Nowadays, the LED heat dissipation in current market is more and more advance. Take the LED area light FUTURE series from Long sun the for example, it’s provided with Lumileds 3030 LED chip and unique large area heat sink which will take out the heat fast and evenly. The temperature of LED foot point tested @40D is 64℃,the lifetime for this item is get up to 100,000hrs.

 

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