LED chip structure and composition materials

LED chip, called CHIP in English, is the main material for making LED lamps (LED LAMP), LED screen (LED DISPLAY), LED backlight (LED BACKLIGHT), made of gallium phosphide (GaP), gallium aluminum arsenide (GaAlAs), or It is made of gallium arsenide (GaAs) or gallium nitride (GaN). Its internal structure is a PN junction with unidirectional conductivity.

1, the role of the chip: the chip is the main component of the Lamp, is a semiconductor material that emits light.

2. Composition of the chip: The chip is made of materials such as gallium phosphide (GaP), gallium aluminum arsenide (GaAlAs) or gallium arsenide (GaAs), gallium nitride (GaN), and its internal structure has unidirectional conductivity.

3, the material of the LED chip

The solder pads of the chip are generally gold pads or aluminum pads. The shape of the pad is circular, square, cross, and the like.

The color of the chip's illumination depends on the wavelength (HUE). The classification of common visible light is roughly: dark red (700nm), deep red (640-660nm), orange (615-635nm), amber (600-610nm), yellow ( 580-595 nm), yellow-green (565-575 nm), pure green (500-540 nm), blue (435-490 nm), purple (380-430 nm). White light and pink light are a mixture of light effects. The most common is a mixture of blue + yellow phosphor and blue + red phosphor.

Led chip internal structure diagram

CWDM - Coarse Wavelength Division Multiplex

CCWDM is Compact CWDM (Compact Coarse Wavelength Division Multiplexing), a wavelength division multiplexing technology based on TFF (Thin Film Filter). It works in the same way as CWDM modules, except that CCWDM uses free space technology. , compared with the common CWDM optical fiber cascading method , the CCWDM package size is greatly reduced compared with CWDM modules, and the insertion loss is lower and the consistency is better; it can replace CWDM Products are used in telecommunications, enterprise networks, PON networks, cable television and other fields. The lower insertion loss enables the CCWDM module to have lower signal attenuation during use, thereby reducing the power requirements of the signal transmitter.

For the CWDM module, limited by the minimum bending radius of the optical fiber line, the size of the packaging box cannot be made too small, resulting in most of the space in the box being idle. The adjacent channels of CCWDM use parallel beams to cascade in free space instead of optical fibers. Without the optical fiber used for cascading, the size of the CCWDM packaging box can be greatly reduced. For example, the size of the common standard 4CH CWDM is 80×60×12 mm, and the size of the CCWDM module of Yiyuantong is 50×27×7.7mm, which is only 1/4 of the standard CWDM package size. Can be widely used in high-density environments.

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