Taiwan's new graphene composite materials can improve LED products lifespan

Taiwan researchers have prepared a new type of graphene composites, which can effectively reduce the LED temperature, thereby greatly improving the LED life.

Light-emitting diodes (LEDs) are rapidly gaining popularity in the world and are well-known for their bright, low-cost, and durable uses, replacing incandescent and fluorescent lamps in many applications. However, few people know that although the LED will not radiate heat, but it will be in the semiconductor junction to generate heat, thus reducing the LED life, even low-power LED will be the case. As people on the LED lights higher power demand, how to control the temperature has become a major challenge.

Currently, Taiwanese researchers have developed a can really replace the heavy, hard aluminum heat sink. The team claims that the use of polyamide (PA) and reductive graphene oxide (rGO) prepared by the heat sink, LED lights can be more effective internal heat.

Using a titanate coupling agent (TCA) as bridging molecule for the reductive oxidation of graphene and polyamide, the researchers developed a dense nanocomposite with a 53% improvement in thermal conductivity over the polymer alone. They tested two different materials (one with polyamides and the other with polyamide / titanate-graphene composites) and applied both materials to the LEDs, Imaging and thermocouple analysis.

The polyamide / titanate-graphene material has a higher equilibrium temperature, indicating that the material has a faster heat transfer rate than the polyamide material. The researchers tested the durability of the composite, the results show that during continuous use, the junction of the high temperature will make LED performance degradation. The results show that the composite retains 95% of its light intensity while the polyamide single-component material retains only 69%.

In fact, the team has developed a thermoplastic material that is comparable to the more expensive graphene in thermal performance and can be molded in an injection molding process that is easy to control. The material helps to prepare low-cost, light weight, flexible LED heat sink, but also improve the LED life.