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How many types are LED light emitting diodes divided into?

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1. LED lights are classified according to the color of the luminous tube

According to the luminous 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 LED light-emitting diodes contain chips of two or three colors. According to the light-emitting diodes doped or not doped with scattering agents, colored or colorless, the above-mentioned light-emitting diodes of various colors can be divided into four types: colored and transparent, colorless and transparent, colored scattering and colorless scattering. Scattering light-emitting diodes are used as indicator lights. 2. LED lights are classified according to the characteristics of the light emitting surface of the luminous tube

According to the characteristics of the light-emitting surface of the luminous tube, it can be divided into round lamps, square lamps, rectangular, surface luminous tubes, lateral tubes, and microtubes for surface mounting. Round lights are divided into φ2mm, φ4.4mm, φ5mm, φ8mm, φ10mm and φ20mm according to their diameters. In foreign countries, light-emitting diodes with φ3mm are usually referred to as T-1; those with φ5mm as T-1(3/4); and those with φ4.4mm as T-1(1/4).

The angular distribution of circular luminous intensity can be estimated from the half-value angle. There are three categories from the angular distribution of luminous intensity:

1) High directivity: generally pointed epoxy package, or package with metal reflective cavity, and no scattering agent. The half-value angle is 5°~20° or less, with high directivity, can be used as a local lighting 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 an indicator light with a larger viewing angle, the half-value angle is 45°~90° or more, and the amount of scattering agent is larger.

3. According to the structure of light-emitting diodes

According to the structure of light-emitting diodes, there are full epoxy encapsulation, metal base epoxy encapsulation, ceramic base epoxy encapsulation, and glass encapsulation.

4. According to luminous intensity and working current

According to the luminous intensity and working current, there are ordinary brightness LED (luminous intensity 100mcd); the luminous intensity between 10-100mcd is called high-brightness LED light-emitting diode. Generally, the working current of LED is from ten mA to tens of mA, while the working current of low current LED is below 2 mA (the brightness is the same as that of ordinary light-emitting tubes).

In addition to the above classification methods, there are also methods of classifying by chip material and classifying by function.

As LED entered and exited the business in the 1960s, after decades of development, many types have been developed. The mainstream categories are:

1) LED (Light emitting diode): We call it LAMP LED products, some call it P2 products, and some call it plug-in LED, anyway, as long as it is a direct plug-in type, it belongs to one kind. And there are many types of LED types:

According to the colloidal shape: 3mm, 4mm, 5mm, 8mm, 10mm, 12mm, square, oval, tombstone, and some special shapes, etc.;

According to the color of the colloid: colorless and transparent, colored and transparent, colored scattering, colorless scattering, etc.;

According to color: red (red), orange (orange), yellow (yellow), yellow-green (green yellow), green (green), blue green (blue green), blue (blue), purple (pink), ultraviolet (uv), white (white), infrared, etc.;

2) SMD (Suface mount device): Surface mount diodes or surface mount components are his name, and there are many categories in this one:

According to the shape and size: 0603, 0805, 1210, 5060, 1010, etc. Generally smd is diamond-shaped, so its name is based on the length * width. The industry uses inches, not millimeters. It is also called in millimeters, not as good as 1608 (1.6*0.8mm).

The type of luminous color and colloid is the same as that of LED products, but the shape of the product has changed a lot.

3) Piranha (Flux led): This is because the luminous efficiency of LED can not meet the requirements of automobile use, so this product is developed. It is a low-power product. Its driving current is generally 50MA, 20MA for general LEDs, and the highest current It can reach 70mA because of its better heat dissipation, which is generally used in car rear lights.

4) Power led: existing lighting LED products, it has the following categories:

According to power points: 1w, 3w, 5w, etc.;

According to the top light-emitting lens: flat head, condensing light, wine glass shape, etc.;

According to the process, there are also aluminum substrate and anti-luminous.

5) Digital tube (Display): the earliest used for display and digital display

According to the appearance: 1, 2, 3, 4, etc.;

Surface color: gray surface vinyl, black surface white gel, etc.;

Polarity: Common Yin, Common Yang;

Colors can also be made in many varieties like LEDs.

6) LED Dot Matrix: This product is similar to the digital tube, which is used for information display. The pitch and the diameter of the holes are different products. Now they are generally divided into 5*7 and 8*8, and the colors are monochromatic, two-color, three-color, and so on.

According to color: single red, single green, double primary colors, three primary colors, etc.;

According to the diameter of the hole: Φ2.0, Φ3.0, Φ3.75, Φ5.0, etc.;

According to points: 5*7, 8*8, 16*16, etc.;

There are some other products: such as clusters, LED Side Light Source, infrared receiving and emitting products (Infrared & PhotoDiode) and so on.

 

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Source: Queendom Technology Co., Ltd.  Author: JACKY   Date: 22 May 2020    https://www.china66.net/news.html

 


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