Introduction: LED lighting technology covers a wide range, is the combination of multi-disciplinary technology and modern information technology, its development shows eight technological development trends.
In recent years, the semiconductor lighting industry has made a breakthrough in terms of output value and technical index. In 2014, the output value of semiconductor lighting sources and lamps was 95 billion yuan, up 43.9% year on year.
Among them, LED lighting exports were $9 billion, up 50 percent year on year, and LED lighting penetration was 20 percent. In the first half of 2015, LED lighting products increased by about 23 percent year-on-year, and exports from January to May amounted to $4.08 billion, similar to the same period last year.
From the latest trends of global semiconductor lighting, the global LED device light efficiency laboratory level has exceeded 300lm/w, the industrialization level has reached more than 150lm/w, LED whole lighting efficiency laboratory level reached 200lm/w. The goal of SSL program in the United States is to achieve the industrialization level of device light efficiency of 250lm/w, and the industrialization level of LED whole light efficiency of 200lm/w.
In short, the permeability and luminous efficiency of LED lighting products are still far from the theoretical value and the target value, and there is still a great breakthrough in technology.
1. Improve the energy efficiency of LED lighting
Overall LED lamp energy efficiency currently consists of six parts: internal quantum efficiency, chip light extraction efficiency, packaging efficiency, phosphors excitation efficiency, luminaires efficiency and power efficiency.
Under certain boundary conditions, the theoretical value is 58%. At present, the energy efficiency of better lamps is only more than 30%. There is still a lot of room for advancement.
2. Improve the light color quality and color rendering value of LED light source
To improve the light color quality of LED light source, RGB multi-spectral combination, namely multi-chip combination or multi-primary phosphor combination, should be used to achieve a reasonable LED spectral distribution SPD, but also to control the main light color parameters, such as color tolerance, glare, photoelectric scintillation, etc.
The chromogenic characterization of LED light source has long been a subject of debate. LED light source can realize the flexible combination of multi-spectrum. The chromogenic characterization using any kind of parameter is flawed, and the ultimate characterization may be in the form of spectrum. Some experts propose to use color gamut index (GAT) together with CRI to characterize the reduction of color by light.
3LED lighting innovation technology
LED light source, lamps and lanterns are currently the top priority of LED lighting industry, technology to accelerate the innovation of lamps and lanterns modeling and control function, specifically the appearance of lamps and lanterns shape creative, flexible size, light volume adjustment, light color flexible change, installation position at will.
4. In-depth development and application of intelligent lighting
The technical characteristics of intelligent lighting include open, distributed, remote control and telemetry, compatibility, interactivity, etc., which is the deep integration of lighting technology and information technology.
It involves a wide range of technologies, and the key technologies include interface integration between luminous modules and driving power, etc. At present, it is urgent to have a unified basic standard, which should be researched and promoted according to the actual demand.
5. Vigorously expand the application field of LED lighting
To promote the application of non-visual lighting systems, such as medical care, ecological agriculture, LED visible light communication, infrared LED and ultraviolet LED applications, which are rich in content and application technology is developing rapidly.
LED display application technology focuses on the development of HD small-pitch display and HD bendable display technology to achieve HD LED TV and HD foldable and wearable display devices.
6. Study on narrow spectrum LED devices
The narrow spectrum of a single LED can realize the spectral flexibility of combined LED, which can realize a larger color gamut space in LED display, which is a large application field. The technology of realizing narrow spectrum LED devices needs to make breakthroughs in material epitaxy.
7 White LED devices will gradually shift to RGB combination
The use of RGB combination of white light theoretically has higher light efficiency, and convenient lamps dimming, color tuning, color rendering, etc. Technically, it is necessary to focus on improving the light efficiency of green LED, RGB combination may become the mainstream of general lighting.
8 Natural light lighting will be the ultimate goal
With the development of LED multi-spectrum lighting, people will pay more attention to energy-saving lighting, health lighting and ecological lighting, using similar to sunlight lighting will be the best choice, that is, natural light lighting, using LED technology can be realized, but to solve a lot of technical problems.
LED lighting technology has a lot of room for development, and needs to further improve the overall energy efficiency and light quality.
While actively promoting the innovation of lamps and lanterns in the application, we should constantly expand the application fields, such as intelligent lighting, non-visual lighting and high-definition display; In technology to achieve the ultimate goal, that is, natural light lighting, to provide people with energy saving, healthy, comfortable lighting environment.