The effects of LED street light temperature is too high

Semiconductor light-emitting diodes ( 领导) During the work with the traditional light source, also can produce heat, follow below to learn about the solar street light manufacturer.

under the effect of external electrical energy, the radiative recombination of electrons and holes in electroluminescent, radiate near the p-n junction of light to pass through the chip itself and encapsulating semiconductor media medium to reach the outside world ( Air) 。 Integrated current injection efficiency, radiation luminescence quantum efficiency, chip external light extraction efficiency, etc. , only about 30 - eventually 40% of the input electric energy into light energy, and the rest - 60 70% of the energy is mainly to the radiative recombination occurs in the form of lattice vibration into heat energy.

LED lights work is stable, the quality is good or bad, and the light body heat itself is crucial to the high brightness leds on the market of heat dissipation, often using natural cooling, the effect is not ideal.

the LED light source of LED lamps and lanterns, consists of LED, heat dissipation structure, drive, the lens, so the heat dissipation is also an important part of, if the LED can't very good heat dissipation, and its life will be affected. Thermal management is the main problems in application of high brightness LED. As a result of group III nitride p-type doping is limited by the solubility of Mg acceptor and holes can start, high heat easier to produce in the p type area in particular, the heat must be through the whole structure can dissipate on heat sink; LED device of heat conduction and thermal convection cooling way is mainly; Substrate material very low thermal conductivity lead to devices thermal resistance increase, severe since the heating effect of a devastating impact on the performance and reliability of the device. The influence of heat to high brightness leds. Heat concentrated in size small chip, chip temperature, thermal stress caused by non-uniform distribution, chip light-emitting efficiency and fluorescent powder blaster efficiency decline; When the temperature exceeds a certain value, the device failure rate law of exponential increase.

statistics show that the component temperature every 2 ℃, a fall of 10% reliability. When multiple dense array of white light LED lighting system, the heat dissipation problem is more serious. Solve the problem of heat management has become a high brightness LED application prerequisites.