Japan R & D new LED or outbreak of LED lighting system history revolution

Quantum dots have experienced an important moment. Last month, Samsung's first QTV was officially shipped and production was steadily increasing, meaning that promises of 15 years ago seem to have come true.

At present, Hiroshima University researchers have silicon-based quantum dots for the development of a new type of light-emitting diode, and promised that this will be a new revolution in lighting system history. These researchers have created an inorganic / organic hybrid light-emitting diode that emits blue and white light through quantum dots. This blue-white LED will lead us to invent a new generation of free-lighting and display lighting systems.

In a study published by Applied Physics Letters, researchers said their QDs emit light at just 6 volts and emit 78% of their effective light From the silicon quantum dots.

To give you an idea of how these numbers were calculated, about 6 years ago, the optical efficiency of quantum dots used in state-of-the-art electroluminescent diodes was reduced from more than 90% to about 15% because these quantum dots must be loaded Into an organic film, used to conduct electricity.

The Japanese researchers also said that their LEDs produce input and output power densities of 280 and 350 times those of the previously reported devices, respectively. The reason for the high input and output power densities of these quantum dot-based LEDs is that these hierarchies are being optimized to some extent to better enable carrier transfer.

The actual physical size of this LED can provide 4 square millimeters of effective area, which is 40 times the unique commercial LED. In addition, the thickness of this LED is only 0.5 mm.

Perhaps the most intriguing aspect of the survey is that the new LED is manufactured by a solution process, which needs to be done at room temperature and at room pressure.

This manufacturing process involves selecting a glass substrate and pouring some of the conductive polymer solution and the colloidal silicon quantum solution onto it.

Ken-ichi Saitow, a professor and research leader at Hiroshima University, added: "Quantum dot LEDs have attracted a great deal of attention as the next generation of LEDs, and although its successful applications require some breakthroughs, quantum dot hybrid LEDs have yielded fruitful results It will go far beyond our imagination. "