With the rise of global environmental awareness, incandescent bulbs will adopt a policy of gradually reducing consumption to reduce the amount of energy waste caused by environmental light sources. Instead, the new generation of light sources with the most alternative advantages are LED products . LED development has gradually gained a number of mature advantages, such as power saving, high efficiency, high reaction speed, long life, and many environmental advantages of mercury-free in the whole process, plus small size, light weight and various The characteristics of the surface setting and other components have become the application light source actively developed by the global luminaire and component factory. However, in fact, only 20% of the energy input by the LED can be converted into light energy, and the remaining 80% of the energy is mostly formed. Waste heat dissipation.
Although LED has many environmental advantages in components, like ordinary incandescent lamps, the heat generated by the lamps themselves will indirectly affect the service life of the lamps themselves, especially the LEDs are point-like light sources, and the heat generated by them is also Concentrated in a very small area, if the high temperature can not be solved smoothly, the junction temperature of the LED will be high, which will directly affect the service life and luminous performance of the LED.
LED light attenuation problem must be improved by assistive technology
Although LED is a futuristic light source component, even if it has the advantage of long life, it still has its life limit, especially for high-power LEDs. Because of its high luminous power, the added power is large and the working time is long. It must even be placed in outdoor applications, and the limitations of the environment and the components themselves often result in a significant reduction in their service life.
In the past, the concept of components all thought that LEDs have at least 100,000 hours of life. In fact, when the current components are used in the field, they do not necessarily achieve such high standards of life performance. In fact, the core of the problem lies in the light decay of LEDs. In general, if the fault of the line or the power circuit is not considered, if the brightness of the LED component itself is reduced to less than 30%, the LED component can be regarded as unsatisfactory. Observing the light decay phenomenon of LED can be discussed from many aspects. Most white LEDs are represented by blue-crystal LEDs with optical plastic doped yellow fluorescent powder. Taking white LEDs as an example, the light decay phenomenon can be from blue light. The light itself of the crystal grain and the light decay of the yellow phosphor itself constitute two parts.
In the problem of light decay of phosphor powder, the effect on temperature is very great. In the case of light decay of crystal grains, there is a big gap in the light decay of different colors. The difference in light decay characteristics depends on different manufacturers. The process and the formula of the phosphor powder will affect its performance. It is difficult to draw conclusions from the consistency discussion. The light decay performance of the general LED components can be confirmed by the test data of the LED manufacturer. Component characteristics.
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