Since the advent of the 1960s, lasers have "made a difference" in many fields, but it has always had a short board that emits only a single wavelength of light. Now that the U.S. scientists have solved the problem, they have developed for the first time a white-emitting laser. The researchers said that white lasers are brighter and more energy-efficient than light-emitting diodes (LEDs) and will play an important role in lighting and wireless communications in the future.
According to the Physicists Network July 30 (Beijing time), a team led by Ning Junzheng of the Arizona State University's School of Electronics, Computer and Energy Engineering developed a novel nanoflake. The size of this delicate semiconductor is only one-fifth the size of the hair, the thickness of only one-thousandth the thickness of the hair, which has three parallel parts, each part can issue one of the three primary colors of red, blue and green Color laser. The entire device emits all visible laser light, from red to green to blue, or any color in between, and when the primary colors "meet", a white laser appears.
Recent research has made laser a viable alternative to LEDs as a mainstream light source. Laser brighter, more energy efficient and provides more accurate and vivid display colors for use on computers and television screens. Researchers also confirmed that their new device emits 70% more color than the current display industry standard.
Another important application of this research will be the field of visible light communication, future indoor lighting systems or also for communication. The technology that scientists are currently developing is called "Li-Fi" (that is, visible wireless communication, which transmits information wirelessly using fast optical pulses). Now "Wi-Fi" uses radio waves. Li-Fi speeds up to 10 times the Wi-Fi, and white laser Wi-Fi may be 10 to 100 times the LED-based Li-Fi currently being developed.
Although this concept is very important, it is still a big hurdle to apply this white-emitting laser to real-life lighting or display systems. The researchers said the next key is to get the same white laser driven by the battery. For the current demonstration, researchers must use a laser to make the electrons glow. The latest experiment will pave the way for a white laser to be finally obtained under electrical operation.
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White laser is not newborn, it is very useful in color display, special lighting, surgical diagnosis and white light interference experiments. But a "whole" white laser has never been invented. Once upon a time, the solution to this problem is to use several independent lasers to produce primary colors. And a laser can output the red, green and blue three primary colors at the same time, it can reduce unnecessary bulky devices, save the difficulty of light coaxial and save the cost. Although there is still a long way to go between this device and the actual application, the first concept of successful verification remains underestimated.
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