Seven technical hot spot in 2015 LED industry Innovation can I win

Technology not only promote the development and progress of science and technology and industry, the industry development present a phased characteristics, with era characteristics.Reviewing 2015, CSP, UV LED, LED, graphene quantum dots, the silicon substrate...Are all in the past year LED the development of industrial technology hot keywords.

CSP

CSP (Chip ScalePackage), is a kind of new Chip size package technology, packaging size and have the same core Chip size, the kernel area and packaging area ratio is about 1:1. 1, all conform to the standard of packaging can be called "CSP.Due to its maximum flux (high density) of unit area and the chip and package BOM cost than the largest (lower packaging costs) that CSP is expected to be on the lm / $and open the subversive breakthrough, is considered to be "the ultimate" packaging format.CSP has potential advantages in reducing the cost, in addition to this, also has an obvious advantage in the other segments, such as on the design of lamps and lanterns, is reduced greatly as a result of CSP packaging size, can make the lamps and lanterns design more flexible and compact structure will be more concise.In performance, due to the small shiny surface, high dense characteristics of CSP, easy to optical directional control;Using the electrode of flip chip design, make its current distribution is more balanced, more suitable for current drive;Droop of the effect is slow, and reduced the light absorption, make the space of CSP has further enhance photosynthetic efficiency.On craft, sapphire make phosphors and chip MQW region distance increases, phosphor temperature is lower and the white light conversion efficiency is also higher.Therefore, CSP was expected, even in the industry "CSP technology assembly house life, sooner or later leather just haven't time to".To this, the personage inside course of study says, technology of questioned whether "opposition", or "make" a strong, CSP technology products has come out and indeed on the market.Although the current face low light efficiency, welding problems such as difficult, light color consistency, but the shiny surface of small, high density, uniform color, small volume increase application flexibility, great potential cost reduction space, seems to have indicated that CSP technology LED encapsulation will be the future development trend."We should not only see the strengths of the new technology, also saw some shortcomings to make up for, controversial, there is insufficient to better promote the application and development of CSP technology. In the future, they can all leather assembly house life remains to be the time to test and verify."

UV LED

UV LED usually under single wavelength at 400 nm, invisible light, also known as UV LED.Has the direction of good performance, low voltage, green environmental protection, the wavelength can be measured, long life, light and flexible, fast switching and seismic resistant to moisture etc.With deep uv LED (light emitting wavelength shorter than the 300 - nm) key technology constantly breakthroughs, ultraviolet light source is applied to daily life, the production of scientific research, homeland security, biological, medical, biological detection, all-weather confidentiality non line-of-sight communications, and many other fields.Related data to predict, UV LED the market of the past few years an average of 28.5% a year, and in the next few years will accelerate growth, is expected to reach $500 million by 2019.Experts predict that the future nitrides deep uv LED as the next generation of uv light source, in industrial production, family health, biological, medical, communications security, and many other fields, has a broad application prospect, so should be deployed early, grasp opportunities, to become the market leader in the future.However, the material preparation technology is still the bottleneck during deep uv LED.


Quantum dots LED

Quantum dots (QD) Quantum Dot, and a new concept of nano-scale semiconductor light-emitting particles, was found in 1981.Its constituent elements not only confined to Ⅱ - Ⅵ (BaS, CdTe and so on), Ⅲ - Ⅴ (GaAs, InGaAs), Ⅰ Ⅲ - Ⅵ several elements (AgInS2, etc.), the family of the future will also have more system will be developed.Quantum dots are basic quantum dot (QLED) LED light-emitting materials.Light form has two kinds: one is to use in GaN base LED as light conversion layer, effectively absorb blue light emitting wavelengths in the visible light range of precision adjustable light;2 it is to adopt the electroluminescent form, its coated between the thin film electrode and shine, realize QLED glow.As quantum dots LED lighting (QLED) there are three advantages: one, can emit full spectrum, which covers the whole visible light and infrared area;Two, they glow limitations of quantum properties, and release the smaller bandwidth of the light, the wavelength of the emitting half width under 20 nm, thus showing a more saturated color of light;After three, quantum efficiency is 90%, also there will be more room to improve.With the improvement of quantum dots preparation technology, especially the spectrum of quantum dots with adjustable size, large stokes shift, high luminous efficiency, light stability and a series of unique optical properties, make it more become the focus of research in recent years, and have made great progress.At present, quantum dots (QLED) LED light source is also born in the laboratory.And more forecasts suggest that over the next 15 years quantum dots LED will light up all over the world.Quantum dots have a wide range of commercial influence on LED technology, at present, improving its manufacturing steps and increase profits is a focus in the field of study.It is reported that the United States Oregon state university researchers have demonstrated a new quantum dots manufacturing technology, can not only ensure made consistent quantum dots size and shape, also can make more accurate color control, may mean that the LED lighting the coming of the new era.

graphene

Graphene (Graphene) is stripped from the graphite material, composed of carbon atoms arranged in special structure has only one atom thick layer of two-dimensional crystal.Is currently known nature the most thin, high strength material, breaking strength steel 200 times higher than the best.It is not only the world's most hard materials, and also most flexible, has the very good elasticity, can be unlimited stretch, stretch rate can reach 20% of the size of itself, can resist a lot of pressure, but also has the unusual thermal conductivity and electrical conductivity, known as "miracle material".Strange is that the graphene zero penetration, all gas, liquid impermeable, make graphene products have "needle not into, water poured into the".Graphene is also with super adsorption, and has the very good pervious to light, raw material for transparent electronics.Graphene is not only very high technical content, potential application is also very wide range of carbon materials.As a high-tech materials, graphene in the semiconductor industry, photovoltaic industry, lithium ion battery, aerospace, military industry, a new generation of displays, and other areas of the traditional and emerging field will bring revolutionary advances in technology.

Technology of silicon substrate

Silicon substrate technology is LED chip substrate is one of the three main technical route.Namely, silicon carbide substrate, sapphire substrate, silicon substrate.Among them, the technology of silicon carbide substrate is take the route of "noble", the high cost of the substrate preparation technology and LED by the us company monopoly.The sapphire substrate technology mainly in the hands of the Japanese company, low cost, is currently on the market mainstream line;Heat dissipation is poorer, but crystal sapphire wafers with vertical growth difficult, it's hard to do big size crystal cannot make vertical structure of the device, substrate is also difficult to stripping.And the third way is China silicon substrate technique developed independently, it makes up for the first two big technical route.As a third LED chip manufacturing technology route of silicon substrate technology compared with the other two have four big advantages: one is cheaper than the price of sapphire and silicon carbide silicon materials, and the production efficiency is higher, so the cost is low, can make the LED at a much lower cost than the sapphire substrate chip;Two is a device with excellent performance, the chip good antistatic performance, long life, can withstand high current density;Three chip packaging process is simple, the chip for the top and bottom electrode, single vertical structure, lead in device packaging, a single electrode lead, simplify the encapsulation process at the same time, more save packaging cost;Fourth, with independent intellectual property rights, the product can be sold to the international market, is not restricted by international patents.Have industry economists said the continued to decline in the cost of background, the technology of silicon substrate if can obtain capital flattered, the pattern of the LED industry is expected to be recreated.From the national strategic level, silicon technology of gallium nitride is our country with independent intellectual property rights of technical route, can build China completely independent of the LED industry;From the industry level, based on the silicon material is cheap and easy to obtain, silicon-based gallium nitride technology advantage, using the mature integrated circuit production, can push from the device to the chip, encapsulate and so on the whole industrial chain cost greatly decreased."Silicon technology of gallium nitride then you should get further support of relevant national policies and support, the LED the whole industry chain will have a great influence, we are looking forward to the policy of the ground."The personage inside course of study says.Reportedly "silicon substrate high photosynthetic efficiency GaN base blue light-emitting diodes," won "national technology invention award" in 2015, so many LED companies has already started the layout."Silicon substrate high photosynthetic efficiency GaN base blue light-emitting diodes," declare by jiangxi province, the project is mainly responsible for personnel including nanchang university professor feng-yi jiang, lattice lighting (jiangxi) co., LTD., the sun of money, etc.


LiFi: LED the next killer application?

LiFi technology is not really strange, based on the visible light communication technology development of wearable device will be in the future, widespread popularization and the concept of intelligent lighting will also further all aspects of daily life, including smart home outfit, agriculture, lighting, medical applications and other fields.
2014 Nobel laureate in physics nakamura second prophecy, LED industry next killer application in optical communication (LiFi).Nakamura to fix two pointed out that the existing communication methods mainly by optical fiber cable communication with microwave wireless communications (such as WiFi) is given priority to, but the WiFi vulnerable to interception, microwave harmful to human body be reviled for two big drawbacks.And the LED light as transmission signal of a vehicle, there is no these issues, as long as the signal a intercepted, light was breaking, and immediately to the naked eye can perceive, higher security.In addition, the LED light is no microwave, do not harm the human body, do not interfere with the instrument, now in the hospital, the airplane cabin conditions such as high place, have been used.LiFi, relative to the WiFi leds in raising speed of data transmission, and visible light can't cross the wall, the family will become more safe on the Internet.In addition, in the field of precise positioning, LiFi also shows the advantage.LiFi, supporters say, is the basis of technology substitution of WiFi.But there are also people who believe that LiFi substitution effect exists, but will be visible as the communication carrier, we still have some limitations, in the future, LiFi may coexist with WiFi complementary, applied to intelligent city.Complementary and coexistence, suggests that LIFI have the effect that cannot ignore.Although LED the application of optical communication, however, the industry said that if the future popularization, as long as there is light, there is the signal.Open the lamp on the table, for example, can download the video.Standing under the street light can go online to check the map;Each frame in the supermarket, also can send different product information to consumers through the light.Even under the surface of the seafloor, as long as the light can transmit signals.
At present, the technology of the LiFi is still in its stage of development, most still stay in the laboratory stage, also for LiFi technology research and development, industrialization and other issues need to solve, also had not been large-scale development and application, but also the industry's future, thought it must become an important direction of the LED.Now Japan, the United States, Britain, Germany, France and China to develop the visible light communication technology, the expected LiFi technology provides solutions would create a whole new information in the global market.


Technology layout: the third generation of semiconductor lighting materials

The third generation of semiconductor materials is developed rapidly in recent years with GaN and SiC and ZnO as representative of new semiconductor materials, has forbidden band width is big, high breakdown electric field, high thermal conductivity, high electron saturation rate and the advantages of strong ability to resist radiation, is a solid-state lighting and power electronics, microwave, radio frequency devices "core", in the semiconductor lighting, a new generation of mobile communication, smart grid, high-speed rail transit, new energy vehicles, consumer electronics and other fields have broad application prospects, is expected to become a supporting information, energy, transportation, national defense, such as the focus of the development of new materials, new strategic highland is becoming a global semiconductor industry.It is predicted that by 2020, the application of the third generation of semiconductor technology will create in the three areas in our country are potential market value of the trillions of dollars, will generate huge market space.The Chinese government attaches great importance to the research and development and industrialization of the third generation of semiconductor materials and devices, with support from the government's continuous deployment, overall level of material research and development in our country and the international gap is not large, such as in the third generation of semiconductor materials of the industrialization of the first applications, semiconductor lighting has a breakthrough on the key technology, application of international leading innovation;In the third generation of semiconductor electronics applications, in the field of mobile communications, photovoltaic inverter, radar has a small demonstration application.