"Rigid-Flexible" Strategy Realizes Robust Ultralong Phosphorescence for Multifunctional Display Unit and Photoreceptor Synapse.

Abstract

Amorphous materials are highly attractive for the development of ultralong room temperature phosphorescence (URTP) due to their ease of processing, scalability, and flexibility. However, the realization of stable URTP polymers remains a great challenge. Here, it is reported a robust and flexible approach to realize high-quality URTP polymers by doping the organic phosphor into the polymer matrix with both hydrophilic and hydrophobic components. This unique structure enables double confinement of the triplet exciton of phosphor, resulting in ultra-bright amorphous URTP films. URTP films exhibit narrow-band emission, ultra-long phosphorescence lifetime, ultra-high phosphorescence efficiency, and distinctive photoactivation properties, with intense phosphorescence emission observable even in daylight. Furthermore, it is demonstrated color-tunable emission through förster resonance energy transfer (FRET) and explores its potential applications in 3D printing, patterned displays, and bionic photoreceptor synapses. The work provides valuable insights into the design of robust, high-quality phosphorescent materials, which could pave the way for a wide range of applications in display and bionic technologies.