Two-in-One: Quantum Dot Breakthrough Combines Laser and LED Capabilities

Lab researchers drive colloidal quantum dot lasing technology closer to device-ready. Los Alamos National Laboratory researchers have made significant progress in developing high-intensity light emitters using colloidal quantum dot technology, creating dual-function devices with unprecedented bri

An artist’s representation of colloidal quantum dots cast from solution onto a grating and excited either electrically or optically to produce multicolor output . Credit: Albin GuyotLos Alamos National Laboratory researchers have made significant progress in developing high-intensity light emitters using colloidal quantum dot technology, creating dual-function devices with unprecedented brightness levels.

The quantum dot layer also behaved as an efficient waveguide amplifier with large net optical gain. The Los Alamos team achieved narrow-band lasing with a fully functional LED-type device stack containing all charge transport layers and other elements required for electrical pumping. This advance opens the door to the highly anticipated demonstration of lasing with electrical pumping, the effect which will allow for full realization of the colloidal quantum dot lasing technology,.

To boost optical gain, the team developed new nanocrystals that they dubbed “compact compositionally graded quantum dots.”

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