MIT has developed a new quantum dot LED can cover all visible spectrum

Researchers at the Massachusetts Institute of Technology (MIT) have demonstrated a general structure for generating organic quantum dot light-emitting diodes (LEDs). This quantum dot LED (QD-LED) is expected to be used in the field of RGB flat panel display (RGB flat-panEL displays).

Because of the use of ZnCdS quantum dots and ZnCdSe materials, the team expanded the QD-LED color gamut, extended to the deep blue and dark red, but a carrier transmission (carrier-transporting) materials and devices of the same green, orange. Mixed organic QD-LED has the advantages of pure color, flexibility and low cost.

Left: the combination of photo devices developed at MIT, the area is 0.6 x 1.9 mm2, blue and cyan running on the bias voltage of 6V, green and orange is 4V, red 5V. Right: quantum dot LED electroluminescence spectrum, blue green orange 5V voltage, cyan 6V, red 4V. Source: Nano Lett

Massachusetts Institute of Technology Polina Anikeeva, Jonathan Halpert and his colleagues in different ways, each of the visible spectrum synthesis technology using colloidal quantum dots (CdSe, ZnS, ZnSe with ZnCdS layer and ZnCdSe alloy). Researchers can use the same organic substrate to grow each quantum dot category.

Because this method allows for the independent processing of each quantum dot, the same device structure can be achieved for all the quantum dots. The future, can adopt the method of contact printing, making RGB flat panel display, easy realization of RGB pixel stacked quantum dots. "Anikeeva representation.