Photoactivated organic phosphorescence by stereo-hindrance engineering for mimicking synaptic plasticity

Abstract

Purely organic phosphorescent materials with dynamically tunable optical properties and persistent luminescent characteristics enable more novel applications in intelligent optoelectronics. Herein, we reported a concise and universal strategy to achieve photoactivated ultralong phosphorescence at room temperature through stereo-hindrance engineering. Such dynamically photoactivated phosphorescence behavior was ascribed to the suppression of non-radiative transitions and improvement of spin-orbit coupling (SOC) as the variation of the distorted molecular conformation by the synergistic effect of electrostatic repulsion and steric hindrance. This “trainable” phosphorescent behavior was first proposed to mimic biological synaptic plasticity, especially for unique experience-dependent plasticity, by the manipulation of pulse intensity and numbers. This study not only outlines a principle to design newly dynamic phosphorescent materials, but also broadens their utility in intelligent sensors and robotics.

Synergistic effects of Tb doping in long-persistent luminescence in Ca3Ga4O9: xBi3+, yZn2+ phosphors: Implications for novel phosphorescent materials

“…Due to its remarkable luminescent properties, LPLP has unlocked immense prospects across various application domains. These include security measures and anti-counterfeiting [ 2 ], optical information storage [ 3 , 4 ], photocatalysis [ 5 , 6 ], photochemistry [ 7 , 8 ], fingerprint recognition [ 9 ], lighting devices [ 10 , 11 ] and potential implementations in synaptic plasticity [ 12 ].…”

Regulating Isolated‐Molecular and Aggregated‐State Phosphorescence for Multicolor Afterglow by Photoactivation

“…Meanwhile, UV light is an attractive stimulus for regulating phosphorescence properties, leading to considerable interest in UV light-responsive UOP materials for their applications in multilevel anticounterfeiting [36] and mimicking human visual memory. [37] A series of molecular rotors for dynamic and reversible aggregated-state phosphorescence have been devel-oped by manipulating intermolecular interactions in the crystalline state using photoactivation. [38] The isolated-molecular phosphorescence with dynamic UV light-responsive properties has also been reported in the polymer matrix.…”