As the structure of LED filament light no extra heat structural parts, can only rely on gas and shell cooling. According to the three elements of heat transfer, convection and radiation, the current light is not conduction, only convection and radiation. But mainly convection heat, the proportion of radiation is very small. If the introduction of graphene technology into the filament lamp, is to use the thermal radiation characteristics of graphene to increase the filament lamp heat dissipation, to extend the service life of filament lamp.
Based on this idea, by testing the blackbody radiation properties by applying graphene on the same copper sheet and without performing a comparative test, it is possible to clearly see the place where the graphene is coated, and its thermal radiation characteristics are very noticeable, Ene, there is no obvious heat radiation characteristics. In addition, the coating of graphene material coated on the copper foil or aluminum foil above, but also done a comparative thermal imaging experiments, the results are consistent, so graphene has a better thermal radiation characteristics.
Based on the results obtained, the graphene is used on the metal substrate at the back of the filament, the heat generated by the LED heating is radiated through the graphene, and the heat conduction in the blister is used to achieve effective convection and reduce the temperature.
According to the comparison of graphene and non-graphene molybdenum products, it can be seen that the temperature of the chip coated with graphene is 3-5 degrees lower than that of the graphene-free junction temperature, so that the junction temperature of the chip, which can extend the lifespan of led filament.
