LED light source, the light-emitting mechanism oled module

With incandescent or gas discharge lamp emitting principle different. The spontaneous light emitting LED is due to the recombination of electron and holes generated.low temperature lcds
LED is an N layer, and P is formed by the P-type semiconductor layer and the N-type semiconductor is formed by a double hetero structure into the active layer of the intermediate composition. The active layer is a light emitting region, the use of an external power source to inject electrons to the PN junction under forward bias, the N region to the positive direction diffusion into the active layer, hole P diffusion to the negative direction into the active layer, the electron and hole recombination, the spontaneous radiation, as shown in Figure 1. LED because of the type of materials used, the diode within the energy level of electron hole share different level combined impact of the difference in height between the photon energy and produce light of different wavelengths, that is, light of different colors, such as red, orange, yellow, green, blue or visible light.
White LED
The emergence of white LED white LED semiconductor lighting more and more indoor and outdoor lighting project. White LED luminous efficiency have made great progress, the white LED has even begun to challenge the traditional position of the light source.
Get white LED there are two ways: the first is through the phosphor conversion white; the second different colors of LED chip package together, multi-chip hybrid emits white light. For the above two ways, according to the number of participation mixed white-color light source can be divided into two primary color system, and a multi-primary color system.graphic oled module