How to extend the life of solar LED street lights and provide energy-saving effects

In the past, in order to profit from high-efficiency LEDs, companies used to develop large-size LED chips to achieve their expected goals, but in fact, when the applied power of the LED continues to exceed 1W, the light beam will decrease, and the luminous efficiency will be relatively reduced by 20%. ～30%, in other words, if the brightness of the LED is several times greater than that of the traditional LED, the following four major problems must be overcome first: 1. To suppress the temperature rise; 2. To ensure the service life; 3. To improve the luminous efficiency; 4. To emit light Equalization of features. The temperature rise control is to reduce the thermal impedance of the package; the specific method to maintain the service life of solar LED street lights is to improve the chip shape and adopt small chips; the specific method to improve the luminous efficiency of solar LED street lights is to improve the chip structure and adopt small chips; The specific method for homogenization of luminous characteristics is to improve the packaging technology of solar LED street lights. The calorific value of high-power LEDs is more than tens of times higher than that of low-power LEDs, and the temperature rise will also greatly reduce the luminous efficiency. Even if the packaging technology allows high heat, the junction temperature of solar LED street lights may exceed the allowable value. Finally, understand It is the fundamental method to solve the heat dissipation problem of the package. For the service life of solar LED street lights, for example, the use of silicon sealing materials and ceramic packaging materials can increase the service life of LEDs by 10%. In particular, the emission spectrum of white light LEDs contains short-wavelength light below 450nm, and traditional epoxy resins The sealing material is easily damaged by short-wavelength light. The luminous efficiency of solar LED street lights, improved chip structure and packaging structure, can reach the same level as low-power LED light sources. The main reason is that when the current density is increased by more than 2 times, it is not easy to take out the light from the large chip, and the result will be The luminous efficiency is not as good as the dilemma of low-power LEDs. If the electrode structure of the chip is improved, the above-mentioned light extraction problem can be solved.　　 Regarding the uniformity of light-emitting characteristics, generally as long as the uniformity of the phosphor material concentration of solar LED street lights is improved, the manufacturing technology of the phosphor should be able to overcome the above problems.