In-Situ versatile characterization and manipulation toward Amorphous-to-Crystalline phase transition via nanoparticles strategy for organic luminescent materials and its applications

In-situ characterization and manipulation toward the evolutions of optical properties during the amorphous-to-crystalline phase transition (ACPT) for the organic solid-state luminescent (OSL) materials are of great significance but yet still a big challenge. In this work, we demonstrated a strategy to conveniently in-situ characterize and monitor the optical changes caused by the ACPT for the OSL materials via the nanoparticle suspension (NPs). The freshly prepared NPs of OSL materials will spontaneously undergo the ACPT from the amorphous cluster to an orderly NPs crystalline structure along with the blue shift of emission while maintaining their particle size as well as the suspension's excellent transmittance and homogeneity. Interestingly, the ACPT process for the OSL materials can be manipulated by the environment temperature, concentration and size of NPs, inorganic electrolyte, and surfactant. By the ACPT via NPs of OSL materials at different times, continuous tunable luminous color can be realized by a single component material, this versatile manipulation toward the ACPT of OLS nanomaterials is expected to be applied in anti-counterfeiting ink, photodynamic therapy, and other optical fields.