Cadmium selenide quantum dots

The oil-soluble CdSe/ZnS quantum dot products produced by our company are based on CdSe as the core, ZnS as the shell layer, and core/shell type fluorescent nanomaterials coated with hydrophobic ligands. The average quantum yield is 70%. Avoid direct sunlight, store in a sealed dark place at 4°C, and can customize products from grams to kilograms for customers. This product has the characteristics of uniform particle size, wide absorption spectrum, narrow and symmetrical emission spectrum, and high and stable fluorescence intensity. It is especially suitable for the green and red components of quantum dot light-emitting diodes (QLEDs). It can be applied to solar cells, Light-emitting devices and bio-fluorescence labeling and other fields.

Annotation：

1. Maximum emission wavelength: the emission wavelength corresponding to the strongest position of the oil-soluble quantum dots. The main reason for the ±10 nm emission tolerance is the difference between product preparation batches and the difference of detection equipment.

2. Half peak width: the width of the band when the height of the maximum height of the emission spectrum is half, the smaller the value, the better the monochromaticity of the emitted light.

3. Absolute quantum yield: only effective particles in the product that can emit light. Measured by a dedicated instrument.

4. Packaging specifications: The standard packaging is 1g of powdered quantum dots dispersed in 9mL of isobornyl acrylate. Store in 10ml vials (pictured)

In addition, we have the mass production capacity of oil-soluble quantum dots, and can provide bulk powder products, such as 1kg-100kg. Please call us for the prices of products with different sales specifications.

Overview of quantum dots

When the semiconductor material drops to a certain critical size, the movement of electrons in three dimensions is restricted, showing a quantum confinement effect. Such materials are called quantum dots (QDs)
The quantum confinement effect causes the electronic energy level near the Fermi level to change from continuous to discrete energy level or to widen the energy gap. The discrete energy level structure with similar molecular characteristics can emit fluorescence after being excited. Quantum dots are generally spherical or quasi-spherical, and their diameter is often between 2-20 nm. Common quantum dots are composed of IV, II-VI, IV-VI or III-V elements.

(Red quantum dot core-shell structure)

(Green quantum dot gradient alloy structure)

Display field (the main application of quantum dots)

Quantum dots can emit pure light through electroluminescence or photoluminescence, which can significantly enhance the color display effect and reduce the energy consumption of the display. Quantum dot displays have become an important competitor of organic light-emitting displays (OLED) and may become the next generation of display technology. Quantum dot display applications include light conversion elements/photoelectric conversion elements, quantum dot TVs, quantum dot tablets, quantum dot smartphones, etc.

Lighting field

Quantum dot lighting technology can effectively improve the problem of color distortion of lighting objects faced by LED lamps. Based on the energy-saving, high-efficiency, bright and long-lasting LED lamps, the color can be adjusted and the light quality can be improved. Quantum dot lighting applications include quantum dot solid-state white light source devices, LED lighting, etc.

Solar field

The quantum dot material itself has a variety of properties of nanoparticles, which can absorb a wide range of solar energy, and its development and application in printable inks are expected to produce high-efficiency, low-cost and light-weight solar cells in the future.

Life Science Field

Quantum dot detection reagents can perform qualitative, localized or quantitative detection of antibodies or antigens by combining the specificity of antigen-antibody reaction and the sensitivity of quantum dot fluorescence, providing improved in vivo and in vitro biological imaging.

Quantum dots show that the internal and external environment for development is more favorable

In terms of color gamut, since the beginning of the new century, people have pursued higher and higher levels of color in display products. The latest Rec.2020 color gamut standard has reached 67% of the visible range of the human eye, and this standard is being increasingly used. Accepted by manufacturers and consumers. In 2015, the Blu-ray Disc Association officially established Rec.2020 as the color gamut of the Ultra HD Blu-ray specification. The Consumer Electronics Association of America (CEA) released its new definition of HDR (High Dynamic Range), which includes the Rec.2020 standard. At the same time, the Japanese broadcasting company NHK has also announced that they will broadcast the 2020 Olympic Games in full Rec2020 colors. Quantum dot displays can reach the Rec.2020 standard to the greatest extent and are expected to benefit from the promotion of the Rec.2020 standard.

In terms of energy consumption, the contemporary world economic development has begun to emphasize green and environmental protection, and low-energy electronic products have gradually become popular, and quantum dots are one of the most energy-efficient choices in display solutions. Due to the extremely high photon conversion efficiency of quantum dots, almost every photon of incident light can be converted into a photon in a narrow spectral range. In other words, for the same color gamut performance, the quantum dot display requires less energy . Taking QD Vision's Color IQ display solution as an example, it can save 50%-100% of energy consumption compared to traditional LED TVs under the same conditions.

In terms of cost, the price of quantum dot TVs has gradually declined in recent years, and product competitiveness and popularity have increased significantly.

QLED: The future star in the display field

The structure of QLED is very similar to that of OLED technology, except that the organic material of OLED is replaced with quantum dot inorganic material, which is also electroluminescent without backlight module, making the product thinner and more energy-efficient than QD LCD technology. Liquid crystal display products have inherent problems such as light leakage, low contrast, poor viewing angle, and slow response speed. In addition, QLED has the potential to manufacture curved screens, expanding its potential applications to mobile phones, tablets and smart wearable devices.

Table 10 QLED, OLED, LCD performance comparison

Table 11 OLED application prospects

1 Cost Quantum dots show potential bottlenecks

Compared with existing LCD products, the cost of quantum dot display products is still relatively high, which limits their large-scale promotion. The key factor in the future competition between QLED and OLED is also the cost. The cost of the two technical routes can be the first to achieve a breakthrough, which may determine the future development direction of the display field. Of course, the synthesis cost of quantum dots is also a decisive factor for the cost.

2 Capacity

If the future of quantum dot display develops in accordance with the optimistic forecast of IHS and other research institutions, the supply of quantum dot materials will be insufficient in the future, and there are only a few manufacturers such as 3M that can manufacture high-quality quantum dot films. Therefore, the future development of the quantum dot display field may be possible. Will encounter capacity bottlenecks.

3 Supply Chain

Quantum dot products involve high-end nanomaterials, and the entire supply chain has high technical barriers. However, traditional LCD manufacturers have low output value and limited technology, and large-scale development in the future may face supply chain problems.

Major foreign manufacturers of quantum dot materials：

Major domestic manufacturers of quantum dot materials：

Development and opportunities

The development background of our company's quantum dot project

The quantum dot project was launched in September 2017. The technical team of Jiangsu Huada Group Company inspected foreign advanced quantum dot technology companies and markets, and cooperated with corresponding foreign technical teams to introduce them to jointly develop industrialized mass production processes. With the cooperation and promotion of the technical teams of both parties, the project achieved a phased success in May 2018. In the same month, Changzhou Huada Nano Material Technology Co., Ltd. was established for this purpose. As of January 2020, with the goal of stably supplying qualified samples, our company has now fully developed a stable continuous experimental process route for two kinds of quantum dots (GQD, RQD). From the adaptive optimization and adjustment of equipment, formula, process, etc., a stable domestic raw material supply channel is basically determined.

Project performance advantages:

At present, most of the quantum dot synthesis processes of domestic and foreign companies are restricted by the reaction mechanism and process conditions. Their quantum dot process can only synthesize small-yield quantum dots by batch reactor reaction. The output is low and there is a certain degree of volatility in product quality from batch to batch. Moreover, the raw materials they use are more refined and expensive, the domestic purchase price is expensive and there are still some raw materials that have no purchase channels. So compared to this, our current results appear to have more advantages:

1. The raw materials are basically industrialized raw materials, which are relatively cheap and easy to obtain, and the supply is stable. At the same time, an agreement has been reached with some raw material suppliers to jointly develop higher-quality raw materials.

2. The success of the continuous reaction process directly solves the problem that cannot be scaled up due to the limitation of the mechanism, improves the output per unit time, and the waste liquid produced is far lower than other companies' production processes.

3. Respond to the working condition of 300℃, precise control of the mixing time of each material, batch method production is prone to errors, resulting in poor repeatability. Our current process response basically effectively reduces the above risks and has strong stability.

4. The quantum dot products produced by our company's unique reaction process have stable quality and higher quality than the current quantum dot products in the European and American markets.

The above advantages have formed a unique quantum dot synthesis process and raw material formula of our company, forming a unique technical barrier.

Project Outlook

At present, the company's quantum dot project is basically feasible for large-scale production after technical evaluation. Our company currently plans to put into production a production project with an annual output of 60kg (red quantum dot solid 30kg, green quantum dot solid 30kg). The estimated annual output value is 600 million yuan, and the profits and taxes are 300 million yuan. Because it is a continuous reaction process, the project under the annual production volume requires a small area for the workshop, a small operating unit, and a high safety factor. The workshop production site requires only an area of 100-120 square meters, plus the warehouse, DCS operation room, raw material storage tank area and some supporting engineering facilities, the total production area only needs to cover an area of 500-600 square meters, which is about one acre of land.