How are LED light emitting diodes classified?-EEWORLD

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1. According to the color of the light emitting tube

According to the color of the light emitting tube, it can be divided into red, orange, green (subdivided into yellow-green, standard green and pure green), blue light, etc. In addition, some light emitting diodes contain two or three colors of chips. According to whether the light emitting diode is doped with scattering agent or not, and whether it is colored or colorless, the above-mentioned light emitting diodes of various colors can also be divided into four types: colored transparent, colorless transparent, colored scattering and colorless scattering. Scattering type light emitting diodes are used as indicator lights.

2. Classification by 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, it can be divided into round lamps, square lamps, rectangular lamps, surface light-emitting tubes, lateral tubes, micro tubes for surface mounting, etc.

According to the diameter, round lamps are divided into φ2mm, φ4.4mm, φ5mm, φ8mm, φ10mm and φ20mm. In foreign countries, φ3mm LEDs are usually recorded as T-1; φ5mm is recorded as T-1 (3/4); and φ4.4mm is recorded as T-1 (1/4). The half-value angle can be used to estimate the angular distribution of circular luminous intensity. There are three categories based on the angular distribution of luminous intensity:

(1) High directivity. It is usually a pointed epoxy package or a package with a metal reflective cavity without adding a scattering agent. The half-value angle is 5°~20° or less, with high directivity. It can be used as a local lighting source, or used in conjunction with a light detector to form an automatic detection system.

(2) Standard type. Usually used as an indicator light, with a half-value angle of 20°~45°.

(3) Scattering type. This is an indicator light with a larger viewing angle, a half-value angle of 45°~90° or larger, and a larger amount of scattering agent.

Keywords：LED Reference address：How are LED light emitting diodes classified?

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