What are LED lights?
Definition of LED lamps
What is LED?
LED (full name Light Emitting Diode), that is, light emitting diode, is a semiconductor solid light emitting device. It is a type of semiconductor diode that converts electrical energy into light energy.
Light-emitting diodes are composed of a PN junction like ordinary diodes, and also have unidirectional conductivity. When a forward voltage is applied to the light-emitting diode, the holes injected from the P region into the N region and the electrons injected from the N region into the P region recombine with the electrons in the N region and the holes in the P region respectively within a few microns near the PN junction, resulting in spontaneous emission fluorescence.
LED lamp is the use of LED lighting principle for lighting appliances, the light emitting device in the lamp is LED lamp bead
LED lamp bead several kinds of classification
white light composition
natural light is a kind of mixed light, which is scattered by water vapor or prism, it can be seen that white light is a mixture of seven colors of red, orange, yellow, green, blue, indigo and purple
LED white light principle
① red, green and blue mixed (RGB color mixing method)
install blue, green and red lamp beads in a certain range, or there are chips of these three colors at the same time in a lamp bead, and the required white light
is mixed by adjusting the intensity of the three colors of light. ② Blue light and yellow light are mixed (BY method)
. Inside the LED lamp bead, the chip emitting blue light is selected, and yellow fluorescent powder is covered on it at the same time, the required white light
LED white light spectrum
is mixed by a certain ratio. The abscissa of the spectrum chart is the wavelength (unit: nanometer), and the ordinate is the relative luminous intensity (that is, the maximum value is 1), This graph characterizes the strength of the energy intensity at each wavelength . Because different wavelengths represent different colors of monochromatic light, also characterizes the amount of each color in this light color.
