Seven technical hot hit you do not know on the out!

The progress of technology not only promotes the development and progress of science and technology, but also makes the development of the industry show the characteristics of stages, and has the characteristics of the times. Review 2015, CSP, UV LED, quantum dot LED, graphene, silicon substrate...... Are the focus of LED industry technology development in the past year.

CSP

CSP (Chip ScalePackage), is a new chip size package technology, package size and chip size is basically the same, the core area and packaging area ratio is about 1:1.1, in line with the standards of packaging can be called "CSP".

Because the unit area of the maximum luminous flux (high optical density) and BOM chip and package cost maximum ratio (low package cost) to CSP in lm/$and is expected to open a breakthrough subversive, is considered to be the "ultimate" package.

CSP has a potential advantage in reducing the cost, in addition, it has obvious advantages in other aspects, such as in the lighting design, because the CSP package size is greatly reduced, which can make the lamp design more flexible, the structure will be more compact. In the performance, due to the small area and high light - emitting CSP characteristics, easy optical directional control; electrode design using flip chip, the current distribution more balanced, more suitable for high current drive; slow down the Droop effect, and reduce light absorption, so that CSP has further enhanced the effect of light space. During the process, the distance between the phosphor and the chip MQW area is increased, and the phosphor temperature is lower and the white light conversion efficiency is higher.

Therefore, CSP is expected to be placed in the industry, and even spread in the industry, CSP technology sooner or later to the life of the packaging plant, but the time has not yet to say.

In this regard, insiders said that the emergence of technology, whether it is the opposition questioned, or support faction firm, CSP technology products have indeed come out and listed. Although the current will face the problem of low light efficiency, difficult welding, light color consistency, but its light emitting surface, high optical density, uniform color, small volume increase flexibility, the decline in the cost of application terminal characteristics of space potential, seems to suggest that the CSP technology will be the future development trend of LED package. We not only want to see the strengths of the new technology, but also to see some shortcomings to make up for the controversial, there are deficiencies in order to better promote the application and development of CSP technology. For the future can be the life of the packaging factory, has yet to be verified. "

UV LED

UV LED generally refers to a single wavelength of less than 400nm visible light, also known as ultraviolet LED. The direction has the advantages of good performance, low voltage, wavelength measurement, green environmental protection, long life, light and flexible, rapid, high tide proof switch.

With deep ultraviolet LED (wavelength shorter than 300nm) continue to make breakthroughs in key technologies, the ultraviolet light source is applied to the daily life, production and scientific research, homeland security, Bio Medical, biological detection, all-weather NLOS secure communication and other fields.

Related data predict that in the past few years, the average annual growth rate of UV LED market reached 28.5%, while in the next few years will accelerate growth is expected to reach $500 million by 2019.

Experts predict that the future nitride deep UV LED as the next generation of UV light source, in the fields of industrial production, home health, Bio Medical, communication security, and has broad application prospects, so it should be early deployment, seize opportunities, to become the market leader in the future. However, the material preparation technology is still the bottleneck of the deep UV LED.

Quantum dot LED

Quantum dots (Quantum Dot, QD), a new concept of nanoscale semiconductor light-emitting particles, was discovered in 1981. The composition elements are not only limited to several elements of the family of II VI (BaS, CdTe, etc.), GaAs (III, InGaAs), I - III - VI family (AgInS2, etc.), there will be more system components will be developed in the future.

Quantum dots are the basic materials of quantum dot LED (QLED) luminescence. Light form has two kinds: one is used as the light conversion layer in GaN based LED, the effective absorption of blue emission wavelength in the visible range can be adjusted accurately; two is the use of the electroluminescent form, the coating on the film between the electrodes and the light, QLED light.

Quantum dots as illuminated by LED (QLED) has three advantages: one, can emit the full spectrum, which covers the whole visible light and infrared light; two, they can limit the luminescence properties of quantum, and the release of light small bandwidth, the half width of the emitted wavelength below 20 nm, thus showing a more saturated color; three, the quantum efficiency of 90% and later there will be more room for improvement.

With quantum dots preparation technology, especially the spectral quantum dot technology with adjustable size, large Stokes shift, high luminous efficiency, good light stability and a series of unique optical properties, making it become the focus of research in recent years, and has made significant progress.

At present, the quantum dot LED (QLED) light source is also born in the laboratory. And more forecasts show that the next 15 years, quantum dot LED will light up the world.

Quantum dots have a wide range of commercial impact on LED technology, and now the focus of the research is to improve the manufacturing process and increase profits. According to reports, researchers at the Oregon State University have demonstrated a new quantum dot manufacturing technology, can not only ensure made quantum dot size and shape can be more precise consistent from beginning to end, the color control, may