An innovative record of white light LED luminescence efficiency through a quantum dot radiating light

Researchers from the American Academy of optics have made use of nanomaterials to make white light LED, with a luminous efficiency of 105 lumens per watt, and a new record. The researchers further studied the luminescence efficiency of 200 lumens per watt, and could be used in the future in the fields of home, office or television.

The current white LED on the market is mainly made by covering a layer of yellow phosphor on the blue light LED. But because the spectrum of phosphor is too wide, it is difficult to make the light on the detail. The researchers then combine the blue light LED with the elastic lens, the lens on the nanoscale semiconductor particles, that is, quantum dots. When the quantum dots are irradiated with blue light, green and red light will be emitted, making the blue and green three color light knots into white light.

(source: American Optical Society)

Unlike phosphors, the range of the quantum dots is smaller and the chromatic light is more consistent, so the combination of the emitted light and blue light can produce high quality white light, which accurately presents the required color temperature and optical properties.

In order to create a new white light LED, the researchers put in the lens and the LED chip, in the mixture of cadmium, zinc, selenium and other substances and quantum dots, and the use of a special silicon resin lens, in addition to the light transmission, can also ensure that the solvent is not permeated when the lens is put into the lens. The researchers point out that the white light LED emitted through the liquid is two times the efficiency of the LED light emitted through the solid film.

Sedat Nizamoglu, who is responsible for the study, says that LED of 200 lumen light sources per watt can effectively reduce half of the world's lighting power. Greenhouse gas emissions can be reduced by about 2 million tons, and the new LED is easy to make, low cost and favorable for future production. The chromatic light emitted by the quantum dots can be changed by increasing the volume of the semiconductor particles, and at the same time the density of the quantum dots can be changed, and a warm color or a cold color light source can be selected. The next step is to use the cadmium free solvent, in addition to maintaining the high efficiency of LED luminescence, it can also meet the requirements of environmental protection.

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