Researchers at the Optical Society of America have used nanomaterials to create white LEDs with a luminous efficacy of 105 lumens per watt and a new record. After further research, the researchers have achieved a luminous efficacy of 200 lumens per watt, which can be applied in the home, office or television fields in the future.
The white LEDs currently on the market are mainly made by covering a blue LED with a layer of yellow phosphor. However, due to the wide range of spectra emitted by the phosphor, it is difficult to make white light adjustments on the details. This time, the researchers combined the blue LED with a flexible lens, which placed nano-scale semiconductor particles, which are quantum dots. When the quantum dots are illuminated by blue light, green and red light will be emitted, and the blue, green and red light will be combined into white light.
Source: American Optical Society
Different from the phosphor, the quantum dot radiation spectrum has a small range and the generated color light is relatively uniform, so that the combined color light and blue light can produce high-quality white light, and accurately display the desired color temperature and optical characteristics.
In order to create a new white LED, the researchers placed a solvent mixed with cadmium, zinc, selenium and other materials and quantum dots in the lens and LED chip, and used a special silicone lens to make light. In addition to the transfer, it also ensures that the solvent does not seep out when it is placed in the lens. The researchers point out that white LEDs emitted by liquids are twice as efficient as LED light emitted by solid-state films.
Sedat Nizamoglu, who led the research, said that LEDs with 200 lumens per watt can effectively reduce half of the world's lighting power, reducing greenhouse gas emissions by about 200 million tons, and the new LEDs are easy to manufacture and cost-effective. Conducive to mass production in the future. The color light emitted by the quantum dots can change the volume of the semiconductor particles, and can also change the density of the quantum dots, and select a warm color or a cool color source. The next step for researchers is to switch to cadmium-free solvents, in addition to maintaining high efficiency of LED illumination, it can also meet environmental requirements.
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