LED light-emitting diode parameters, characteristics, classification and selection

1, LED light-emitting diode selection points

The selection of LEDs should focus on the following characteristics:

a, color; b, package size; c, forward voltage; d, power consumption; e, cost; f, working temperature;

2, the characteristics of led LED

2.1led LED basic structure

Light-emitting diodes are referred to as LEDs , and the main materials that make up LEDs include: die, adhesive, gold wire, bracket, and epoxy.

The following picture shows the manufacturing process of the SMD LED:

2.2 LED type

Light-emitting diodes are divided into two types: patch and plug-in according to the assembly method.

The positive and negative signs of the SMD LED are as follows:

The positive and negative signs of the plug-in LED are as follows:

According to the type of illumination, it can be further divided into a common monochromatic light emitting diode, a high brightness light emitting diode, a color changing light emitting diode, a flashing light emitting diode, a voltage controlled light emitting diode, an infrared light emitting diode, and the like.

2.2.1 ordinary monochrome light-emitting diode

Ordinary monochromatic light-emitting diodes have the advantages of low volume, low working voltage, uniform and stable operating current, fast response, fast response, long life, etc., and can be driven by various DC, AC, pulse and other power sources. It belongs to a current-controlled semiconductor device and needs to be connected in series with a suitable current limiting resistor.

The color of the illumination of a conventional monochromatic LED is related to the wavelength of the illumination, which in turn depends on the semiconductor material used to fabricate the LED. The wavelength of the red LED is generally 650~700nm, the wavelength of the amber LED is generally 630~650nm, the wavelength of the orange LED is generally 610~630nm, the wavelength of the yellow LED is about 585nm, and the wavelength of the green LED. Generally it is 555~570nm.

Commonly used domestic ordinary monochromatic light-emitting diodes are BT (factory standard model) series, FG (partial model) series and 2EF series. Commonly used imported ordinary monochromatic light-emitting diodes are SLR series and SLC series.