Organic Laser Molecule with High Mobility, High Photoluminescence Quantum Yield, and Deep-Blue Lasing Characteristics

摘要

Here, we design and synthesize an organic laser molecule, 2,7-diphenyl-9H-fluorene (LD-l), which has state-of-the-art integrated optoelectronic properties with a high mobility of 0.25 cm~2 V~(-1) s~(-1), a high photoluminescence quantum yield of 60.3%, and superior deep-blue laser characteristics (low threshold of P_(th) = 71 μJ cm~(-2) and P_(th) = 53 μJ cm~(-2) and high quality factor (Q) of ~3100 and ~2700 at emission peaks of 390 and 410 nm, respectively). Organic light-emitting transistors based on LD-l are for the first time demonstrated with obvious electroluminescent emission and gate tunable features. This work opens the door for a new class of organic semiconductor laser molecules and is critical for deep-blue optical and laser applications.