Turkish scientists have produced white LEDs based on nanomaterials.
According to a recent report by the US Daily Science website, Turkish scientists have developed a new type of white light-emitting diode (LED) with a luminous efficiency of 105 lumens per watt. The researchers said that with further development, the efficiency of this LED can be Up to 200 lumens / watt or more, is expected to show their talents in the family, office and other fields to achieve more energy-efficient and environmentally friendly lighting.
The new LEDs are fabricated using a combination of commercially available blue LEDs and flexible lenses filled with a solution of nano-semiconductor particles called quantum dots, which emit light that causes the quantum dots to glow green and red. It combines with blue light to produce high quality white light with precise color temperature and optical properties.
The researchers explained that quantum dots have several advantages in the manufacture of white LEDs: they are easy to manufacture; they can be changed by increasing the size of semiconductor particles; changing the concentration of quantum dots can control the properties of light.
In order to manufacture such LEDs, quantum dots capable of efficiently converting blue light into red or green light are required. For this reason, they have carried out more than 300 synthesis reactions, and have obtained light of different colors and performed with the best efficiency. Quantum dots. They are mixed with cadmium, selenium, zinc, and sulfur at high temperatures to form a quantum dot solution, which is filled in the gap between the lens made of silicone and the LED chip. The silicone lens has elasticity, and the solution is injected into it without generating Any leaks, and the transparency of the material ensures that the necessary light can pass.
Currently, researchers are working to improve the efficiency of LEDs and hope to use environmentally friendly cadmium-free and lead-free materials. They also plan to study liquid LEDs under different conditions to ensure they can be used stably for a long time.
Research leader, Sytech Nizamaoglu of Cork University: 'The new LEDs are more efficient than other quantum dot-based white LEDs, and the methods of making quantum dots and synthesizing new LEDs are simple and inexpensive. Suitable for large-scale production. If you can replace the traditional lighting source with an LED with an efficiency of 200 lm/W, it will reduce the global electricity consumption by more than half, and reduce the greenhouse gas emissions by 200 million tons.
