High Mobility Organic Lasing Semiconductor with Crystallization-Enhanced Emission for Light-Emitting Transistors

Area of Science:

• Organic electronics
• Materials science
• Photonics

Background:

• Developing high-mobility organic laser semiconductors with strong emission is crucial but challenging.
• Organic semiconductors are key for advanced photonic devices.

Purpose of the Study:

• To present a novel high-mobility organic laser semiconductor, 2,7-diphenyl-9H-fluorene (LD-1).
• To demonstrate crystallization-enhanced emission and electrically pumped lasing.

Main Methods:

• Modulating the crystal growth process of LD-1 to form one-dimensional nanowires.
• Characterizing photoluminescence quantum yield (PLQY), charge carrier mobility, and lasing properties.
• Fabricating a light-emitting transistor using LD-1 nanowires for electrical emission studies.

Main Results:

• LD-1 nanowires achieved a PLQY approaching 80% and high charge carrier mobility (0.08 cm² V⁻¹ s⁻¹).
• Observed Fabry-Perot lasing with a low threshold (86 μJ cm⁻²) and high quality factor (≈2400).
• Demonstrated electrically induced emission from individual LD-1 nanowire-based transistors.

Conclusions:

• LD-1 is a promising high-mobility organic laser semiconductor with excellent optical and electrical properties.
• The study provides a platform for developing ultrasmall, electrically driven photonic devices and organic lasers.