FRET is a mechanism describing energy transfer between two light-sensitive molecules. Dr. Juan Cabanillas (IMDEA Nanociencia) et al. have studied different fluorene-based polymer blends to produce low threshold lasers operating between 540 and 590 nm (green/yellow). They’ve established the optimal conjugation length of the polymers (number of units) which produces a 4 times increase in optical gain and a 34 reduction in amplified spontaneous emission threshold.
In this paper it is proven how a careful configuration dramatically improves the efficiency of these systems, suggesting a lot of space for improvement. These materials show to be of great interest for electrically pumped light emission structures including LEDs and LETs.
This research has appeared in the cover of Advanced Functional Materials.