Development direction of LED lamp technology

As the problem of greenhouse gas emissions on the Earth is becoming more and more serious, approaching the critical point of the Earth's self-regulation, countries have issued relevant policies, and governments around the world, including China, must implement energy conservation and emission reduction without delay (Carbon dioxide) , LED lights are currently energy-saving green environmental protection electric light source, naturally becoming the main option for lighting energy conservation and emission reduction. With the gradual reduction of the cost and price of LED lights, its popularization speed is also accelerating. Before 2020, the market share of LED lamps will exceed 50. Reducing the cost of LED lamps LED chips account for the main part of the cost of LED lamps, so the main way to reduce the cost of LED chips is to reduce the cost of LED chips. The key to the development of LED chip technology lies in substrate materials and epitaxial growth technology. Substrate materials have developed from traditional sapphire materials, silicon and silicon carbide to new materials such as zinc oxide and gallium nitride. In just a few years, LED has made great breakthroughs in light efficiency with the help of a series of technical improvements including chip structure, surface coarsening and multi-quantum well structure design. The cost of silicon substrate is very low, and the technology is continuously improving, but the luminous efficiency is not satisfactory at present. If this development speed is maintained, once it reaches a higher level, then the silicon substrate becomes the main technical scheme and becomes an inevitable choice, and enterprises will also obtain huge economic returns. To improve the luminous efficiency of LED lamps, the development direction of LED lamp technology follows five major factors. To improve the luminous efficiency, one can also start with improving the proportion of effective light. The thin film chip technology can reduce the light output loss on each side. With the help of the reflection surface at the bottom, more than 97 light rays are output from the front, so that most of the light rays obtained from electric energy conversion are effective light rays, it not only significantly improves the luminous efficiency of LED, but also creates superior convenient conditions for lens design. Thin film chip technology is currently the core technology in the production of ultra-bright LED chips. The color rendering of LED lamps is improved. In high brightness white LED, a small part of blue light has a longer wavelength after Stokes displacement. This is a good thing, because it enables LED lamp manufacturers to use many phosphor layers of different colors, thus expanding the emission spectrum and effectively improving the color rendering index (CRI). The high CRI obtained by white LED using fluorescent powder is costly, because Stokes displacement will cause the efficiency of White LED to be lower than that of monochrome LED. However, for most lighting applications, LED lamps with high CRI and slightly lower efficiency are preferred.