What are semiconductor optoelectronic materials and what are the semiconductor materials

The crystal of silicon is doped with a small amount of trivalent elements such as boron, because boron has only three valence electrons, and when it forms a covalent bond with silicon atoms, it naturally forms a hole due to the lack of an electron. In this way, each boron atom incorporated provides a hole, which greatly increases the number of hole carriers in the silicon single crystal. There are almost no free electrons in this semiconductor, and it mainly conducts electricity by holes, so it is called hole semiconductors, referred to as p-type semiconductors.

Objects such as germanium, silicon, selenium, gallium arsenide, and many metal oxides and metal sulfides, whose conductivity is between conductors and insulators, are called semiconductors.

Semiconductors have some special properties. For example, the relationship between the resistivity and temperature of semiconductors can be used to make thermistors (thermistors) for automatic control; Its photosensitive characteristics can be used to make photosensitive elements for automatic control, such as photocells, photocells and photoresistors.

Semiconductors also have one of the most important properties, and if trace impurities are properly incorporated into pure semiconductor substances, their conductivity will increase millions of times. This characteristic can be used to manufacture a variety of semiconductor devices for different purposes, such as semiconductor diodes, transistors, etc.

When one side of a semiconductor is made into a p-type region and the other side is made into an n-type region, a thin layer with special properties is formed near the junction, which is generally called a p-n junction. The upper part of the figure shows the diffusion of carriers at the interface between p-type semiconductors and n-type semiconductors (indicated by black arrows). The middle part shows the formation process of the p-n junction, indicating that the diffusion of the carriers is greater than the drift (indicated by a blue arrow, and a red arrow indicates the direction of the built-in electric field).

The lower part is the formation of the PN junction. Represents the dynamic equilibrium of diffusion and drift.

Optoelectronic materials refer to materials that can convert light energy into electrical energy or vice versa. Semiconductor materials have very good properties in photoelectric conversion, so most optoelectronic materials are semiconductor materials. The following are the advantages of semiconductor materials in photoelectric conversion:

1.High photoelectric conversion efficiency: Semiconductor materials have high efficiency in photoelectric conversion, which can convert light energy into electrical energy or convert electrical energy into light energy.

2.Wide spectral response range: Semiconductor materials have a wide spectral response range and can undergo photoelectric conversion in different wavelength ranges such as visible, infrared, and ultraviolet.

Why most optoelectronic materials are semiconductor materials.

Optoelectronic materials refer to materials that can convert light energy into electrical energy or vice versa. Semiconductor materials have very good properties in photoelectric conversion, so most optoelectronic materials are semiconductor materials. The following are the advantages of semiconductor materials in photoelectric conversion:

1.High photoelectric conversion efficiency of slag residue: Semiconductor materials have high efficiency in photoelectric conversion, which can convert light energy into electrical energy or convert electrical energy into light energy such as cover rolling.

2.Wide spectral response range: Semiconductor materials have a wide spectral response range and can be photoelectric converted in different wavelength ranges such as visible, infrared and ultraviolet.

3.Faster response speed: Semiconductor materials have a fast response speed and can complete photoelectric conversion in microseconds or nanoseconds.

4.Good stability and reliability: Semiconductor materials have good stability and reliability, and can maintain good optoelectronic properties for a long time.

Therefore, the leaking semiconductor material has good performance in photoelectric conversion and has become the main choice of optoelectronic materials. <>

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Explain why common phosphors are yellow, green, red, and other colors, whether blue phosphors can be used, and explain why.

Kiss, common phosphors are yellow, green, red and other colors, because their luminescence mechanism is emitted by absorbing ultraviolet or blue light through fluorescent exciters. These fluorescent exciters enter the excited state after absorbing photons, and then release energy to emit visible light as they return to the ground state through a non-radiative transition. Different fluorescent excipients are able to absorb different wavelengths of light, and therefore emit different colors.

As for whether blue phosphors can be used, the answer is yes. In fact, blue phosphors have been widely used in LED lighting, fluorescent lamps, fluorescent screens and other fields. The luminescence mechanism of blue phosphors is the same as that of other colors of phosphors, which are photons absorbed by fluorescent excipients and emitted visible light.

The difference is that the fluorescent excitation of blue phosphors needs to absorb shorter wavelengths of light, so higher energy photons are required to excite them. In addition, the preparation of blue phosphors also requires higher technical requirements, as they require higher purity and finer control. In summary, the color of phosphors depends on the absorption wavelength and luminescence wavelength of the fluorescent excipient, so a variety of colors of phosphors can be prepared, including blue phosphors.