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Important parameters of LED chip
Nov 25, 2016

1 positive working current If:

It refers to the positive current light emitting diode light normal value. In actual use should be based on the need to select the IF in 0.6 and IFm.

2 forward working voltage VF:

The operating voltage given in the parameter table is obtained at a given forward current. Generally measured at IF=20mA. Light emitting diode forward voltage VF in 1.4 ~ 3V. When the temperature rises, the VF will fall.

3.V-I characteristics:

The relationship between voltage and current of light emitting diode, the forward voltage is less than a certain value (called threshold), small electric current, no light. When the voltage exceeds a certain value, the forward current increases with the increase of voltage.

4 luminous intensity IV:

The luminescence intensity of light emitting diode (usually cylindrical luminous tube fingering line refers to the axis direction of the luminous intensity). If the radiation intensity in this direction is (1/683) W/sr, then the emission of 1 Candela (symbol CD). As the general LED light emitting diode is small, so the intensity of the light is often used as a unit of light (Candela, MCD).

5.LED light emitting angle:

-90 degrees - +90

6 spectral half width Delta lambda:

It represents the spectral purity of the light emitting diode.

The 7 half value angle 1/2 and angle:

0 1/2 is the luminous intensity values of half axial strength and axial direction of light (normal) angle.


According to the angle of the LED luminous stereo angle conversion, also called the plane angle.

9 angle of view:

Refers to the maximum angle of LED lighting, according to the different perspective, the application is also different, also called light intensity angle.

10 half form:

The angle between the normal 0 degree and the maximum luminous intensity value /2. Strictly speaking, it is the angle between the maximum luminous intensity value and the value of the maximum luminous intensity /2. LED packaging technology lead to the maximum luminous angle is not the method to 0 degrees of light intensity, the introduction of deviation angle, refers to the maximum luminous intensity corresponding to the angle and the angle between the 0.

11 maximum forward DC current IFm:

Allowable maximum forward DC current. More than this value may damage the diode.

12 maximum reverse voltage VRm:

The maximum reverse voltage, which is allowed to add, is the breakdown voltage. More than this value, light emitting diode may be breakdown.

13 working environment topm:

The light emitting diode can be normal working environment temperature range. Below or above this temperature range, light emitting diodes will not work properly, the efficiency is greatly reduced.

14 allows power consumption Pm:

Maximum value of the product of the positive DC voltage and the current flowing through it on the LED. Over this value, LED fever, damage.