With the rapid development of solid-state lighting technology, the efficiency of phosphor conversion white light has begun to surpass that of traditional lighting technology. The improvement of efficiency mainly comes from the improvement of the internal quantum efficiency of epitaxial and the improvement of the external quantum efficiency of chip design. In addition, LED It also offers smaller source sizes and longer life.
At present, the result of high-power LED laboratory has reached 150lm/W, and the luminous flux of single chip has been continuously improved, especially at high current density. How to achieve 1mm × 1mm single-chip LED total luminous flux reaches 1000lm, the efficiency reaches 150lm / W, the core of development lies in extraction efficiency, internal quantum efficiency, turn-on voltage, external quantum efficiency, power conversion efficiency, phosphor conversion efficiency, light efficiency and Luminous flux. The key technology improvements are the increase in internal quantum efficiency and the improvement in phosphor conversion efficiency, especially for warm white light.
There are three main driving forces for solid-state lighting development. One is to promote SSL applications through legislation; the second is to increase social environmental awareness and concepts; and the third is to create high-performance products that meet consumer needs.
Significant cost reductions will accelerate the large-scale application of LEDs in lighting, and we must reduce LED costs by retrofitting package designs, increasing yields, and optimizing production processes. At the same time, we need to improve LED efficacy and enhance system reliability. Because not all LEDs use the same design, one manufacturer's data cannot be applied to all LEDs, and we must enhance the reliability design of the entire system. The reliability of the system does not only refer to the LED device itself, but also includes related components such as photoelectric heat. The reliability of LED luminaires is a function of drive current and LED temperature. The effect of a single LED failure on system reliability is how the LEDs are connected together. There are other reasons besides LEDs that can cause system failures, including solder joints, circuit drives, and aging of external lenses. In addition, LED performance should be evaluated based on specific operating temperatures and currents, and then combined with reliability data to provide different LEDs to the most appropriate application.
The continuous improvement of the performance of LED devices has made it applicable to the field of lighting. The overall cost is a key indicator affecting the acceptance of the LED market. It can reduce the complexity of user use by improving color control and grading. The use of suitable LED products can guarantee such as Successful implementation of municipal lighting projects such as “Ten Cities and Ten Thousand Citiesâ€. (The special correspondent Zhao Yanbing of this journal has been compiled according to the speech of the conference and has not been reviewed by me)
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