The Principle of Semiconductor LED Needs to Be Understood

The light -emitting diode Inumgarnet (CE3: yag) crystal is grinded into powder and mixed with it in a dense adhesive. When the LED chip emits blue light, some Blu -ray will be transformed by this crystal with a wide range of spectrals (about 580nm in the center of the spectrum). (In fact, the YAG of the single crystal mixed CE is considered as flicker than the phosphorus.) Because the yellow light will stimulate the red and green receptors in the naked eyes, the blue light of the LED itself makes it look like white light And its color is often called“Moonlight white”. This method of making white light LED is developed by Nichiacorporation and began to produce white light LED in 1996. If you want to adjust the color of pale yellow light, you can use other rare earth metal 铽 or 钆 to replace the 铈 (CE) incorporated in CE3: yag, and even the way to replace parts or all aluminum in YAG to do it. Based on the characteristics of its spectrum, red and green objects look less than that of the broad -spectrum light source under this LED exposure. In addition, due to the mutation of production conditions, the color temperature of this finished product is not uniform, from warm yellow to cold blue. Therefore, in the production process. Another white -light LED method is a bit like a fluorescent lamp. The LED that emits nearly ultraviolet light will be painted with two phosphorus mixtures, one is red and blue light, and the other is green light. Copper and aluminum with zinc sulfide (ZNS). However, because ultraviolet rays can make epoxy resin cracking and deterioration in adhesives, production is more difficult and life expectancy is short. Compared with the first method, it has a low efficiency and produces more heat (because the former STOKESSHIFT has a large former), but the advantage is that the characteristics of the spectrum are better. Because the LED power of UV light is high, although the efficiency is relatively low, the brightness comes out is similar. The latest method for making white light LEDs does not use phosphorus light body anymore. The new approach is to grow zinc in the zinc -zinc (ZNSE) substrate. When it is powered on, its active area will emit blue light and the substrate will turn yellow, and it will be white light to mix