Low-Temperature-Resistant Elastic Organic Crystals with Variable Amplified Spontaneous Emissions

In recent times, multitudes of organic
crystals exhibiting temperature-dependent
emissions have been reported, as temperature influences the electron
transition process and/or molecular packing structures. However, exploration
of the properties and applications of organic crystals at low temperatures
remains scarce. By utilizing an organic crystal possessing a simple
molecular structure, remarkable flexibility, and amplified spontaneous
emission (ASE) characteristics, we present herein an elastic organic
crystalline material capable of serving as a color-changing lasing
medium at different temperatures, both in the straight and in the
bent states. Moreover, at low temperatures, even in liquid nitrogen,
the crystal exhibits favorable optical waveguide properties, rendering
it a promising optical transmission medium for cryogenic engineering.
The successful realization of a flexible organic tunable laser, along
with an optical transmission medium, broadens the range of organic
crystals available for extreme temperature conditions.