Electro-optical conversion and verification method of LED lamp beads
Electro-optical conversion is the relationship curve between the light output power of the LED lamp bead and the injection current, that is, the P-I curve. Because it is spontaneous radiation, the linear range of the P-I curve is relatively large. The output optical power of LED is one of the important parameters of LED, which is divided into DC output power Po and pulse output power. The so-called DC output power refers to the optical power emitted by the LED under the specified forward DC operating current. During the test, put the LED lamp and the receiver in the same cassette, so that the light-emitting surface and the receiving surface are parallel to each other and as close as possible. Adjust the constant current source so that the forward current IF is the specified value, and the reading on the indicator is the DC output optical power of the LED under test. The so-called pulse output optical power refers to the optical power emitted by the LED light-emitting surface under the rectangular pulse current operation of the specified amplitude, frequency and duty cycle.
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