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.