Based upon Coherent Förster Resonance Energy Transfer, we have successfully demonstrated the first colloid quantum dot laser with two different kinds of quantum dots (donors and acceptors) in the light emitting layer. The donors can resonantly transfer energy into the acceptors, and they also act as scattering centers. Through multiple scattering, it can form a coherent closed loop. All the donors can coherently and resonantly transfer energy into all the acceptors and the laser action is achieved.
We have developed a new physical mechanism, called Coherent Förster Resonance Energy Transfer (CFRET). The process combines the coherent resonance energy transfer in a coherent closed loop. Inside the closed loop, all the donors can coherently transfer energy to all the acceptors, which enables to boost the light emission capability of acceptors and achieve laser action easily. We have adapted this new mechanism to demonstrate electrically driven QDs laser for the first time. ,This work has been commented by the journal reviewer as the most major breakthrough of the last decade in this field.
The electrically driven quantum dots laser has several unique advantages.