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Aore high-end lighting tells you to interpret LED lighting technology from the three levels of chip, package and application

2023/7/22
Today, with the continuous development of LED lighting technology and the increasing attention of society to the energy crisis, the LED lighting industry has ushered in a full-scale outbreak period, attracting many funds and enterprises to pour in, and the competition in the lighting market is becoming increasingly fierce.
If you look at the development of LED lighting technology, you can speak from three aspects, one is the chip level, one is the package level, and one is the application level. The chip level mainly focuses on the manufacturing technology of LED; The packaging level is mainly how to convert the LED chip into a lamp bead or light source that can be used for lighting; LED application level technology development is relatively complex, mainly including the development of electronic control technology, the development and use of new materials, environmental lighting quality evaluation technology development and improvement.

Chip level
The pursuit of high luminous efficiency has been the driving force for the development of LED chip technology. Flip technology is currently one of the main technologies to obtain high efficiency and high power LED chips, substrate material sapphire and matching vertical structure of laser substrate stripping technology (LLO) and new bonding technology will still dominate for a long time.
However, in the near future, the use of metal semiconductor structure, improve ohmic contact, improve crystal quality, improve electron mobility and electric injection efficiency, and improve the extraction light efficiency through LED chip shape surface coarser and photonic crystals, high reflectivity mirror, transparent electrode, then the total efficiency of white LED can reach 52%.
With the improvement of LED light efficiency, on the one hand, the chip is getting smaller and smaller, and the number of chips that can be cut on a certain size epitaxial sheet is getting more and more, thus reducing the cost of a single chip, on the other hand, the single chip power is getting larger and larger, such as 3W now, and will develop to 5W and 10W in the future. This can reduce the number of chips used for lighting applications with power requirements and reduce the cost of the application system.
In short, inversion method, high voltage, silicon-based gallium nitride will still be the development direction of semiconductor lighting chips.


Package level
Chip-level packaging, LED filament packaging, high color rendering index and wide color gamut will be the development trends of future packaging processes. The use of transparent conductive film, surface coarsening technology, DBR reflector technology to improve the light efficiency of LED lamp beads formal packaging is still the mainstream technology; At the same time, the COB/COF technology of flip structure is also the focus of packaging manufacturers, and the integrated packaged optical engine will become the focus of research and development in the next quarter.
Power supply solution (high voltage LED), the popularity of COB/COF applications: driven by the cost factor, the power supply solution has gradually become an acceptable product, and the high voltage LED fully caters to the power supply solution, but it needs to solve the chip reliability. With the advantages of low thermal resistance, good optical type, weld-free and low cost, COB applications will be widely used in the future.
In addition, medium power will become the mainstream packaging method, the current products on the market are mostly high-power LED products or low-power LED products, although they have their own advantages, but also have insurmountable defects, and combine the advantages of the two medium power LED products came into being.
There is also the application of new materials in packaging. Materials with higher environmental tolerance such as high temperature resistance, UV resistance and low water absorption, such as thermosetting material EMC, thermoplastic PCT, modified PPA and ceramic-like plastics, will be widely used.
For the demand for light quality, for indoor lighting, LED color rendering index CRI with 80 as the standard, with 90+ as the goal, try to make the light color of lighting products close to the Planck curve, so as to improve the light quality of LED, indoor lighting will also pay more attention to the quality of light in the future.
By optimizing the LED packaging technology, the light efficiency has been further improved, and has now exceeded 200lm/W, far higher than other heavily used traditional light sources. The heat dissipation performance of LED lamp beads will be further improved, the reliability will be further improved, and the life of lamp beads will be further extended, so that the light color quality will be further improved, and the ultimate human eye comfort will be further improved.


LED application research and development level
At present, application manufacturers mainly achieve cost optimization of LED lighting products through the use of new heat dissipation materials, advanced optical design and new optical material applications, while ensuring product performance.
But in the future, LED lighting application manufacturers will focus on these points:
1. Interchangeable LED light engine technology based on application scenario requirements;
2, based on the Internet of Things platform LED intelligent lighting system architecture technology;
3. Development of LED lighting fixtures based on reliability design, and development of high-performance LED lighting fixtures that maintain color/brightness consistency during the service cycle;
4. Development of lamps based on large-area efficient diffusion plate technology;
5, online light environment experience lighting system solution technology and service system;
6, LED light source color rich characteristics, which makes the scene lighting will also be the core competitiveness of LED lighting.
Traditional lighting fixtures are designed around the shape and size of the light source, and the size is fixed.
The characteristics of LED lighting fixtures are:
The lamp shape is free, the appearance is creative;
The size of the lamp is free, the size is flexible;
Lamp light free, on-demand lighting;
Luminaire spectrum free, light color smart;
The position of the lamp is free, and the installation is arbitrary.


In the future, the shape of LED lamps will no longer be limited to the shape of traditional lamps, but tend to shape liberalization and concealment. Free shape on the one hand to meet the needs of personality, on the other hand can be used as decoration; The concealment of LED will make lighting fixtures hidden but ubiquitous in the form of embedded lighting.
At the same time, LED lighting products achieve random control of light lumens, no longer limited to a fixed wattage in a certain area in a certain scenario, which will be a great technological progress.


Intelligent lighting: Future trends
Intelligent lighting refers to the use of intelligent clients for information collection, processing and control, through the light brightness adjustment, light switch distribution control, spectrum adjustment control, scene setting and other functions, to achieve safety, energy saving, health, comfort and other features.
The characteristics of intelligent lighting technology include distribution, remote control and telemetry, openness, compatibility, interaction and so on.
To achieve intelligent lighting, it is necessary to have client intelligent operation technology and data acquisition technology, Internet data transmission technology, cloud big data management and analysis technology, and situational lighting technology for customer online experience. Only on the basis of these technologies can intelligent lighting be truly realized.
The future requirements for intelligent lighting are personalized display, easy control, and emotional induction.
Home lighting because of its lighting needs are relatively simple, easier to control, so intelligent LED lighting will start from here. However, with the development of technology, the future even in public places, also need a good lighting system, such as outdoor landscape lighting on the intelligent demand is very high, but the technology is difficult to meet the demand.

How to break through the technical bottlenecks and price barriers of intelligent lighting in public places such as outdoor lighting and commercial lighting has also become an urgent problem to be solved.
Intelligence is the inevitable trend of future life. LED lamp intelligence is only a small part of the intelligence of various home equipment, enterprises must make lamps become intelligent and diverse through technology research and development, in order to meet the individual needs of customers. However, the current intelligent lighting technology due to high cost, poor product matching and other problems, resulting in LED intelligent lighting products can not be popularized.
With the improvement of technology, product performance tends to be stable, and the cost is reduced, intelligent LED lamps will certainly be widely circulated in the market. Whether LED companies master intelligent lighting technology, and design products and intelligent control systems to meet market demand, to a large extent, is to determine the long-term development of the enterprise.
From the use of scenarios, the scene is different, lighting requirements are not the same. LED indoor lighting as LED lighting "a torrent", its development through three main stages:

First, improve product performance.
At this stage, LED companies focus on improving product efficiency and ensuring the lighting quality of LED products, such as improving the performance of LED light sources, MR16 lamp cups and LED modules;

Second, optimize the cost.
At this stage, enterprises should shorten the product recovery cycle as much as possible, increase their product capacity, and improve product research and development technology to produce cost-effective products accepted by customers;

3. Lead the digitization of light.
There are three important indicators to measure the quality of indoor lighting: physical indicators, physiological indicators and psychological indicators. Different lighting environments will affect consumers' heartbeat, blood pressure and other physiological indicators, thus affecting consumers' psychological comfort. In lighting applications, physiological indicators and psychological indicators are more important.

The future indoor lighting will not be too concerned about light efficiency, but will pay more attention to the quality of light, pay more attention to the emotional experience of customers, create a pleasant environment through the perception of light, and the color difference of lamps in different observation directions. LED product itself color difference and color bleaching, stroboscopic will affect the indoor lighting effect.
At present, the domestic LED lighting application technology is more dispersed, homogenized products, inferior products filled with LED lighting market, resulting in market chaos and disorderly competition. Many domestic LED enterprises are in the learning stage, rather than independent innovation. Many small and medium-sized enterprises focus on short-term interests, on the other hand, there is not enough resources, time to invest in product research and development, resulting in mixed LED products. The quality and performance of LED products of international lighting companies are superior to domestic products, especially in optical design and product intelligent control.
In response to this situation, small LED enterprises in the early stage, can buy the technology of industry associations, or through the enterprise marketing strength to develop enterprises; Enterprise scale to reach the medium-sized stage, it is necessary to change the development strategy, through in-depth research on the market, clear the future development trend of LED lighting products, and actively invest a lot of resources to improve research and development strength, and compete with the LED lighting market.
LED lighting industry will continue to integrate resources, LED lighting company leaders to have a keen market insight, increase investment to enhance product research and development capabilities, accumulate core competitiveness, in order to be invincible in the future competition.