The material basis of lighting technology is the light source. Therefore, the development of lighting technology is based on the development of light source technology. Since the 1990s, three Japanese scientists, Chisaki Yoshi, Amano and Nakamura, have made rapid breakthroughs in GaN-based blue LED technology. This has also strongly promoted the development of lighting technology, and has brought about tremendous changes in lighting technology, including the following aspects: 1. The mainstream light source of lighting will be converted into LED. Currently, the light effect of high-power LED commercial products It has reached more than 150lm/W and has a lifetime of more than 30,000 hours. These have made the overall performance of LEDs surpass other sources. At the same time, in addition to a large power, the price of LED lamps is close to that of other light sources. Therefore, relatively speaking, LEDs already have certain advantages. At the same time, the luminous efficiency of LED laboratory products has reached more than 300lm / W, and through a reasonable heat dissipation design, the life of more than 50,000 hours is fully achievable. In principle, other light sources have little room for improvement in terms of light efficiency and lifetime. Therefore, it can be expected that LEDs will become the mainstream light source in the lighting market. 2. The research of LED device technology will focus on the improvement of green LED efficiency. The core device LED of semiconductor lighting technology, the current red LED and blue LED have high photoelectric efficiency, but the photoelectric efficiency of green LED is very low. This limits the substantial application of LED spectral flexibility. Therefore, improving the light efficiency of green LEDs is the most important research topic for LED devices. However, the current GaN-based LED technology route encounters a large technical bottleneck, and both the existing technology route and the innovative technical route have yet to be studied. 3. Another study of LED device technology will be the study of narrow-spectrum LED devices. The narrow spectral width of a single LED will help to achieve virtually unlimited flexibility in assembling LED spectra. This will make the application of LEDs more promising. At the same time, in one of the main LED display applications of LEDs, if the spectral width of the monochromatic LED is made smaller, a larger color gamut space can be realized. And this is a big application area. 4. White LEDs for general lighting will gradually turn to RGB mode. The light sources for general illumination are presented in white or near-white light. At present, the most cost-effective white LEDs on the market are all realized by blue LED plus YAG phosphor. However, in theory, the RGB method has higher luminous efficiency, and the RGB method will enable the lamp to be dimmed, toned, and even to display the color index. Therefore, with the improvement of the efficacy of green LEDs, it is believed that the RGB mode (further extended to 3 or more monochromatic LEDs) will become the mainstream white LED mode. 5. The characterization of the color rendering of the light source will be a long-term debate process. The characterization of the spectral form may be the ultimate result. The parameter that characterizes the color rendering of the light source is mainly the color rendering index. However, this is based on the limited spectral form of traditional light sources. The infinite flexibility of the LED spectrum will cause problems with this characterization. It can be expected that if the LED achieves true spectral infinite flexibility, then any one-parameter color rendering characterization will actually be flawed, and the ultimate representation should be the spectrum itself.
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