Efficient Organic Light-Emitting Transistors Based on High-Quality Ambipolar Single Crystals

A cyano-substituted
styrene derivative is synthesized and successfully prepared to lamellate
single crystals through precisely controlling the crystal growth conditions.
The lamellate single crystals with regular edge and smooth surface
display intrinsically ordered stacking and high quality, all of which
are of importance for high optoelectronic performance. The single-component
light-emitting transistors based on the lamellate crystals offer striking
device performance in terms of record external quantum efficiency
of 2.02%, exceeding the benchmark value in this field. Such organic
light-emitting single crystals provide a versatile platform for designing
and engineering their structures and optoelectronic properties toward
light-emitting devices.