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  • Through The Quantum Dot Emission Color Light, White Light LED Luminous Efficiency Record
    Jul 18, 2018

    Researchers at the Optical Society of America used white materials to make white LEDs with a luminous performance of 105 streams per watt, setting a new record. After further research, the researchers have achieved a luminous performance of 200 streams per watt, which can be applied in the home, office or television fields in the future.


    At present, white LEDs on the market are mainly formed by coating a blue phosphor on a blue LED. 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 emitted by blue light, green and red light will be emitted, and the blue, green and red light will be combined into white light.


    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 required 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 transmit light. In addition, it ensures that the solvent does not seep out when it is placed in the lens. The researchers point out that white LEDs emitted through liquids are twice as efficient as LED light emitted through solid-state films.


    Sedat Nizamoglu, who led the research, said that 200 watts of LEDs per watt can effectively reduce half of the world's electricity consumption, and greenhouse gas emissions can be reduced by about 200 million tons. The new LEDs are easy to manufacture and low in cost. Mass production in the future. The color light emitted by the quantum dots can increase the volume change of the semiconductor particles, and can also change the quantum dot density, and select a warm color or a cool color light 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.