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What Is The Classification Method Of LED Light Emitting Diode?

Jan. 31, 2019

LED Light Emitting Diode is a two-terminal device with unidirectional conduction. There are electronic diodes and crystal diodes. Electronic diodes are rarely seen. Most common and commonly used are crystal diodes. The unidirectional conduction characteristics of diodes, semiconductor diodes are used in almost all electronic circuits, and it plays an important role in many circuits. It is one of the earliest semiconductor devices to be born, and its application is also very extensive.

1. According to the luminous color of the luminous tube

According to the color of the luminous tube, it can be divided into red, orange, green (subdivided into yellow-green, standard green and pure green), blue light and so on. In addition, some light-emitting diodes include chips of two or three colors. The light-emitting diodes of the above various colors can be classified into four types of colored transparent, colorless transparent, colored scattering and colorless scattering according to whether the light-emitting diode is doped with or without a scattering agent, colored or colorless. Scatter-type LEDs are used for indicator lights.

2. According to the characteristics of the light-emitting surface of the light-emitting tube

According to the characteristics of the light-emitting surface of the light-emitting tube, the round lamp, the square lamp, the rectangular, the surface light-emitting tube, the lateral tube, the surface-mounted micro tube, and the like.

The circular lamps are divided into φ2 mm, φ4.4 mm, φ5 mm, φ8 mm, φ10 mm, and φ20 mm according to the diameter. In foreign countries, a light-emitting diode of φ3 mm is generally referred to as T-1; a φ5 mm is denoted as T-1 (3/4); and a φ4.4 mm is denoted as T-1 (1/4). The angular distribution of the circular luminous intensity can be estimated from the half value angle size.

3. There are three categories from the angular distribution of luminous intensity:

(1) High directivity. It is usually a tip epoxy package or a metal reflector package with no scattering agent. The half-value angle is 5°~20° or less, and it has high directivity. It can be used as a local illumination source or combined with a light detector to form an automatic detection system.

(2) Standard type. Usually used as indicator light, its half value angle is 20 ° ~ 45 °.

(3) Scattering type. This is a large angle of light with a half value angle of 45° to 90° or more and a large amount of scattering agent.

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