With global energy shortage and environmental pollution, LED display screens have a wide application space due to their energy saving and environmental protection characteristics. The application of LED lighting products in the lighting field is attracting the attention of the world. Generally speaking, whether the LED lamp works stably and with good quality is very important for the heat dissipation of the lamp body itself. Currently, the high-brightness LED lamps on the market often use natural heat dissipation, which is not ideal. LED light fixtures created by LED light sources are composed of LEDs, heat dissipation structures, drivers, and lenses. Therefore, heat dissipation is also an important part. If LEDs do not dissipate heat well, their lifetime will be affected.
Thermal Management Is A Major Issue In High-Brightness LED Applications
Since the p-type doping of III-nitride is limited by the solubility of the Mg acceptor and the higher activation energy of the holes, heat is particularly easily generated in the multiple p-type region, and this heat must be dissipated on the heat sink through the entire structure; The heat dissipation path of LED devices is mainly heat conduction and convection. The extremely low thermal conductivity of the Sapphire substrate material increases the thermal resistance of the device and hire best trainee, produces a serious self-heating effect, and has a devastating effect on the performance and reliability of the device.
Effects Of Heat On High-Brightness Leds
The heat is concentrated in a chip with a small size, and the temperature of the LED chip increases, which causes non-uniform distribution of thermal stress, the chip’s luminous efficiency, and the efficiency of the phosphor lasing. When the temperature exceeds a certain value, the device failure rate increases exponentially. Statistics show that every 2 ° increase in component temperature reduces reliability by 10%. When multiple LEDs are densely arranged to form a white light lighting system in your budget, the heat dissipation problem is more serious. Solving thermal management issues has become a prerequisite for high-brightness LED applications.
Relationship Between Chip Size And Heat Dissipation
The most direct way to increase the brightness of a power LED display is to increase the input power, and in order to prevent saturation of the active layer, the size of the pn junction must be increased accordingly; increasing the input power will inevitably increase the junction temperature and thus the quantum efficiency. reduce. The increase in the power of a single tube depends on the device’s ability to extract heat from the pn junction. Under the existing chip material, structure, packaging process, constant current density on the chip, and equivalent heat dissipation conditions, the chip size and junction area are increased separately. The temperature will keep rising.
