White light laser technology to achieve or replace LED into the mainstream light source?

According to science news reports, the invention of the laser has more than half a century, however, due to technical problems, has always been difficult to produce white laser beam, now have a new breakthrough! According to the latest issue of the International Journal Nature Nanotechnology, the American researchers successfully invented a white light laser device, covering all the wavelengths of visible light range. White light laser can be used in the future display, solid-state lighting, visible light communications and other important areas. In the past 50 years, the laser has developed a variety of colors, with the exception of white. This kind of laser can only radiate a specific wavelength of light and a single color, not the synthesis of white light laser. To achieve this goal, we must create a single radiation structure of red green and blue primary colors at the same time, but the successful growth of heterostructure, each other do not match each other and close to the crystal is difficult, easily lead to all materials have a serious defect.

Nano chip semiconductor alloy work, while the primary composition of white light excitation

At present, the key problem is solved. Arizona State University (Arizona State University) researchers invented nano thickness semiconductor alloy "ZnCdSSe", consisting of zinc, cadmium, sulfur and selenium. The researchers will adjust the temperature and the relevant conditions at any time during the growth stage, and control the interaction of all the materials in each stage to ensure that the crystals can coexist.

Fig. 1 Schematic diagram of the growth process of heterogeneous nanosheets (source: "Nature Nanotechnology")

The nano sheet is divided into three parts, and the red, green, blue and other colors are generated by the light pulse excitation, and then the white is formed. The researcher can use and adjust the light pulse to control the luminous intensity of each segment. White light laser technology covers the color, compared with the general light source more than 70%.

The effect of the color synthesis of the various parts of the nanosheets (source: "Nature Nanotechnology")

White light laser will become an alternative light source, the performance is better than LED

Laser technology is expected to replace the light emitting diode (LED) as the main light source, compared to LED lighting per watt 150 lumens luminous efficiency, the laser can reach up to 400 lumens per watt, more bright and more energy-efficient than LED. White light laser technology can also be used to display, showing a more precise and vivid colors. In addition, visible light communication is another important application. At present, the main development of Li-Fi LED technology, the data transmission speed is ten times faster than Wi-Fi. With the emergence of white light, is also expected to further develop Li-Fi technology, it is estimated that the transmission speed is even faster than LED ten times to one hundred times.

At present, scientists are still studying ways to stimulate the laser, hoping to replace the optical pulse power in the future.

Although white light laser technology has not been able to achieve commercial application in the short term, always a major step for the development of related technologies, I believe that in the near future will be able to implement one by one.

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