Using rice husks to "light up" silicon quantum dot LED lights usher in a broader road to silicon quantum dots!

 

As a very important semiconductor material, silicon has become the foundation of today's semiconductor industry due to its mature processing technology, excellent electrical properties and abundant resource reserves
.
However, the luminous efficiency of silicon is low, because silicon is an indirect bandgap semiconductor, and the recombination of electrons and holes requires the participation of phonons, resulting in a very low probability of radiative recombination and the lack of a core light source for silicon-based optoelectronic integration.
Therefore, it is difficult to realize silicon-based lasers
.

 

Silicon quantum dots usually exist in porous silicon.
The luminescence of porous silicon mainly comes from the luminescence of silicon quantum dots.
Silicon quantum dots can fill the problem that silicon is difficult to emit light with high efficiency
.
Moreover, silicon quantum dots in various existing forms have more excellent light-emitting properties than bulk silicon materials
.
This performance and its optical properties have prompted people to constantly think about the application of silicon quantum dots in the field of optoelectronic devices, in order to achieve the improvement or innovation of optoelectronic device performance
.
In recent years, silicon quantum dots with novel optoelectronic properties have been gradually applied in optoelectronic devices such as light-emitting devices, solar cells, and photodetectors, and a series of research developments have been obtained
.

 

　　At present, quantum dots have begun to enter the market as light emitters for tablet computers and large-screen TVs, and are considered to be the next generation light emitters after OLED
.
Despite the advantages of silicon quantum dots, since the quantum dot displays currently entering the market use heavy metal quantum dots, traditional silicon quantum dots usually involve toxic substances such as cadmium, lead or other heavy metals, so scientists all over the world are exploring Non-toxic, heavy metal free luminaire
.

 

　　Recently, Japanese scientists used recycled rice husks to create the world's first silicon quantum dot LED lamp
.
The research team used a combination of milling, heat treatment and chemical etching to treat the rice husk silica.
They milled the rice husks and extracted the silica powder by burning the organic compounds in the milled rice husks.
They heated the generated silica powder in an electric furnace, obtained silicon powder through reduction reaction, and further obtained 3-nanometer purified silicon powder through chemical etching; finally, they chemically functionalized its surface to make it have a higher Chemical stability and dispersibility in solvents, silicon quantum dots emitting in the orange-red range were prepared with 3 nm nanocrystalline particles, and the luminous efficiency exceeded 20%
.

 

　　The chemical synthesis method developed by the research team allowed them to evaluate the optical and optical properties of silicon quantum dot LEDs, including the structure, synthesis yield, and performance of silicon dioxide, silicon powder, and silicon quantum dots
.
The silicon quantum dot LED lamp they developed is a low-cost, environmentally friendly way to convert agricultural waste into state-of-the-art light-emitting diodes
.
They allow silicon quantum dots to avoid heavy metals, combined with higher operating temperature and stability, making silicon quantum dots one of the favorable candidates for quantum computing, and its non-toxic nature also means it is very suitable for medical applications.

.

 

　　In recent years, due to the special electronic and optical properties of silicon quantum dots, remarkable research progress has been achieved in the fields of light-emitting devices, solar cells, and photodetectors
.
Among them, silicon quantum dot organic LEDs combine the optoelectronic performance advantages of silicon quantum dots and organics, and show good device luminous efficiency
.
Silicon quantum dots have brought new ideas to the development of optoelectronic devices, and due to their non-toxicity, low price, and compatibility with mature silicon-based optoelectronic devices, silicon quantum dots are expected to play an important role in future innovations in optoelectronic devices.
Role!
 

　　(Data reference sources: Science and Technology Daily, CNKI, Science Fiction Network)
 

　　Original title: Using rice husks to "light up" silicon quantum dot LED lights ushered in a broader road to silicon quantum dots!