It’s reported that Benjamin Damilano and a group of researchers of the CRHEA-CNRS in Valbonne Sophia-Antipolis, France, have created quantum well-based white LEDs.
In research published in Applied Physics Letters, the group of scientists was able to create White LEDs using gallium, indium nitride/gallium nitride quantum wells. In their unique design, blue photons emitted under electrical injection by (Ga,In)N/GaN QWs located inside a GaN p-n junction are partly absorbed by another (Ga,In)N/GaN MQW situated outside the junction which emits yellow-green light. The combination of the blue and yellow-green components results in white light emission. The monolithic White LEDs have been demonstrated by the CNRS team and others researchers.
Instead of the epitaxial growth plus the deposition of a light converter such as a phosphor, the researchers' new White LEDs required only epitaxial growth run. The researchers speculate that such a design could bring down the costs of producing white LEDs, and increase their reliability and perhaps their performance.
