LED chip light-emitting diode classification method-Shenzhen Leixingyang Industrial Co., Ltd.

With the progress of lighting technology, recently developed into a white light bright diode, the formation of LED lighting this new industry. LED SMD light-emitting diode is a unidirectional conductive two-terminal device, there are electronic diodes and crystal diodes, electronic diodes are now rarely seen, more common and commonly used are crystal diodes. The diode's unidirectional conductive properties, almost in all electronic circuits, have to use the semiconductor diode, which plays an important role in many circuits, it is the birth of one of the earliest semiconductor devices, and its applications are also very broad.

So, what are the ways to categorize LED SMD light emitting diodes, here to talk about it specifically.

According to the light-emitting tube light-emitting color is divided into:

It can be divided into red, 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 the light-emitting diode light-emitting doped or not doped scattering agent, colored or colorless, the above various colors of light-emitting diodes can also be divided into colored transparent, colorless transparent, colored scattering and colorless scattering four types. Scattering type light-emitting diodes and up to do with indicator lights.

According to the light-emitting tube out of the light surface characteristics are divided into:

（1）There are round lamps, square lamps, rectangular lamps, surface light-emitting tubes, lateral tubes, and miniature tubes for surface mounting.

（2）Round lamps are divided into φ2mm, φ4.4mm, φ5mm, φ8mm, φ10mm and φ20mm according to their diameters. Overseas usually put φ3mm  light-emitting diodes as T-1; φ5mm as T-1 (3/4); φ4.4mm as T-1 (1/4). The circular luminous intensity angular distribution can be estimated from the size of the half-value angle.

There are three types from the luminous intensity angular distribution graph:

（a）Highly directional. Generally encapsulated in a pointed epoxy package or in a package with a metal reflective cavity and no scattering agent. Half-value angle of 5 ° ~ 20 ° or less, has a high directivity, can be used as a local illumination light source, or with the light detector used to form an automatic detection system.

（b）Scattering type. These are indicators with a larger viewing angle, a half-value angle of 45° to 90° or greater, and a larger amount of scattering agent.