The LED fancy light for wall is designed as a solid-state semiconductor device capable of converting electrical energy into visible light, converting electricity directly into light.The heart of the LED is a semiconductor wafer, with one end of the wafer attached to a bracket, one end negative, and the other end connected to the positive terminal of the power supply so that the entire wafer is encapsulated with epoxy resin.
The semi-conductor wafer consists of two parts, one is a P-type semiconductor, in which holes dominate, and the other end is an N-type semiconductor, in which this side is mainly electrons. But these two semiconductors are connected in such a way that a P-N junction is formed between them. When the current is applied to this wafer through the wire, the electrons are pushed to the P region, where the electrons are compounded with the holes, and then energy is emitted in the form of photons, which is the principle of LED light emission. The wavelength of the light, which is the colour of the light, is determined by the material that forms the P-N junction.
Initially, LED is used as an indicator light source for instruments and meters, and then LEDs of various light colours are widely used in traffic signals and large-area displays, which have produced good economic and social benefits. To 12 inches of red traffic signals, for example, in the United States was originally a long life, low-light performance of 140 watts of incandescent lamps as a light source, which produces 2000 lumens of white light. After the red filter, the light loss of 90%, leaving only 200 lumens of red light.
For general lighting, people need more white light source. 1998 white LED development success. This LED is the GaN chip and yttrium aluminium garnet (YAG) packaged together into a GaN chip blue light (λp = 465nm, Wd = 30nm), high-temperature sintering made of YAG phosphor containing Ce3 + by this blue light excitation emits a yellow light shot, the peak value of 550nLED lamp m. Blue LED substrate mounted in a bowl-shaped reflective cavity, covered with a thin layer of YAG resin, about 200-500% of the light source is mixed with YAG. Resin thin layer, about 200-500nm. The blue light emitted by the LED substrate is partially absorbed by the phosphor, and the other part of the blue light is mixed with the yellow light emitted by the phosphor, and white light can be obtained.
For InGaN/YAG white LEDs, by changing the chemical composition of the YAG phosphor and adjusting the thickness of the phosphor layer, white light of various colours with a colour temperature of 3500-10000K can be obtained. This method of obtaining white light through blue LEDs is simple in construction, low cost and high in technological maturity, so it is used the most.
The led light for boundary wall, fancy led lights for wall and so on all use this principle to work, environmental sanctuary, economic and durable.
