Introduction: In the foreseeable future, light bulbs may be “unemployedâ€. Instead of "jobs", it will be a table, a wall, or even a small fork that will shine. A graduate student at Vanderbilt University in the United States accidentally discovered a mixed "paint" in an experiment. After being applied to an LED lamp, the original blue light would emit white light like an ordinary incandescent bulb. The academic community predicts that this new discovery is likely to revolutionize the concept of illuminators beyond the bulb: as long as this "paint" is applied, any object can function as a bulb. This means that the era of light bulb lighting since Thomas Edison invented the light bulb is likely to come to an end. Surprisingly, Michael Bowers is a graduate student at Vanderbilt University. The invention of the hybrid "paint" was derived from his accidental discovery in an experiment. In that experiment, Bowers originally wanted to create a very small quantum dot with a size of a few nanometers, less than a thousandth of a hair. Quantum dots are nanocrystals made of semiconductor materials. They can be called semiconductor nanocrystals, also known as "artificial atoms". They are composed of a small number of atoms and generally have a size below 100 nm. Ordinary quantum dots generally contain between 100 and 1000 electrons. These electrons are very active, and the smaller the quantum dots, the more active they are. The quantum dots produced by Bowers are even smaller than ordinary quantum dots and contain only 33 to 34 pairs of atoms. If the quantum dots are illuminated by light, or when they are powered, the quantum dots will be active and emit bright light of various colors. But when Bowers used a laser to illuminate his quantum dots, unexpected things happened. "When a bunch of white light shrouded the table, I couldn't help but be surprised," Bowers recalls. "These quantum dots should glow blue, but they now emit beautiful white light." After the discovery of "paint" was discovered Bowers and another student sprouted a new idea. They mixed the quantum dots with a resin called polyurethane and applied the mixture to a blue-emitting LED lamp. The bulb type "bloated" coated with a mixture of "paint". But what's important is that it really shines like Bowers wishes. This kind of white light is not the white light formed by the blue light of the LED, but the warm, yellowish white light emitted by the incandescent bulb. The principle of white light emitted by LEDs and incandescent lamps is not the same. The former emits color light through the injection type, and the color light must be converted by a certain kind of phosphor, and then mixed by light to form white light. The latter is a tungsten filament that heats up to emit white light. Moreover, compared to a 60-watt standard incandescent bulb, the "paint"-coated bulb is about twice as bright and the illumination time is about 50 times longer than the former. The findings were published in the online edition of the Journal of the American Chemical Society on October 18. The invention of the future use of quantum dot hybrid "paint" is believed by scientists to make the application of light-emitting diodes into a new era. Compared to 60-watt standard incandescent lamps, LEDs emit brighter light and longer illumination times, lasting 50,000 hours, and are less prone to breakage. In addition, the LED does not generate heat and is therefore more energy efficient. The US Department of Energy estimates that if LED lighting is used all the way, by 2025, the US's energy consumption for lighting will fall by 29%. However, before the introduction of white light-emitting diodes in 1998, it only produced red, green, yellow, blue and other colored light, which limited the scope of use. At that time, LEDs were limited to use in traffic lights, flashlights, and architectural lighting. For general lighting, people need a white light source. The white-emitting light-emitting diodes invented in 1998 require white light to be converted, so that the efficiency is not high. Therefore, Bowers' discovery may greatly expand the range of applications for LEDs. Even scientists have suggested that LEDs can eventually replace incandescent, fluorescent and sodium lamps. In fact, if this invention is commercially available, the light bulb will no longer be the only source of light. Quantum dot blending "paint" can be applied to any specific thing. As long as the quantum dots are activated, this thing can emit light of various colors, including white light. By then, the era of light bulb lighting may be over. (Xinhuanet special draft author He Liu)
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