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Date: 2018-07-19
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New quantum dot white LED light-emitting efficiency record

日期: 2018-07-19
浏览次数: 19

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 reach more than 200 lumens / watt, it is expected to show their talents in the home, 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 in the manufacture of white LEDs, quantum dots have several advantages: they are easy to manufacture; they can change their luminescent color by increasing the size of semiconductor particles; and the concentration of quantum dots can be changed to control the characteristics of light.

In order to manufacture such an LED, a quantum dot capable of efficiently converting blue light into red or green light is required. To this end, they carried out more than 300 synthetic reactions, and obtained quantum dots that emit light of different colors with the best efficiency. They mix 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 is elastic, the solution is injected into it without any leakage, 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 are stable for long-term use.

"The new LEDs are more efficient than other quantum dot-based white LEDs," said Seidt Nizamaoglu, a research director at Cork University. "There are simple and inexpensive ways to make quantum dots and synthesize new LEDs. Suitable for large-scale production. If you can replace the traditional lighting source with LEDs with an efficiency of 200 lm/W, it will reduce the global electricity consumption by more than half, and reduce 200 million tons of greenhouse gas emissions."

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