LED light-emitting principle and main arguments |
1. LED light-emitting principle
The LED is a kind of the electron diode, the main structure is a PN junction. Figure 1, when the voltage is applied to the both end of the LED, electrons absorb the energy to turn to the valence electron band, and then release the energy absorbed, the energy released is light. The wavelength of light emitted and the color is determined by the electric potential difference between the semiconductor decision.
The LED has similar characteristics of the general silicon diode, a voltage is applied between the positive and negative. When the applied voltage reaches a critical value, LED current is generated, start emitting light. When the voltage exceeds this threshold, the current increases dramatically. The threshold voltage of the white LED approximately 3.5V. the threshold voltage values of the Red, green, and blue LED is shown in Table 1.
We use circuit simulation to illustrate the electrical properties and the drive circuit of the LED. The circuit simulation is a simple method that the electronic design of the LED and resistance is modeled and the computer simulates the operation of the circuit. Here is Cadence's circuit simulation PSpiceA / D. While using the Philips Lighting Company's LUXEON series LX3-PW71.
First, using the circuit of Figure 2 to verify the electronic properties of the LED. To get the voltage - current characteristics, the need for direct analysis.
Verify LXM3-PM71 voltage - current characteristic results showed that: in the case of 354mA,the current is about 3.0V
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difference, circuit simulation, electric potential, LED flood light, Philips, PN junction, silicon diode, threshold voltage, tube light, voltage - cur,