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

Abstract

Ultralong organic phosphorescence (UOP) materials have attracted considerable attention in recent years. Herein, a new type of flexible films was fabricated by doping amphipathic pyrene tetra sulfonic acid sodium salts into amorphous poly(vinyl alcohol) matrix, which enabled the realization of color‐tunable UOP spanning from orange‐red to green after excitation light switched off. Interestingly, we demonstrated precise control of the proportion of isolated‐molecular and aggregated state phosphorescence for colorful afterglow using photo‐activation. A 2.19‐fold increase in the dynamic phosphorescence lifetime of isolated molecules was observedfrom 752.94 to 1650.46 ms following an 8‐minute irradiation under ambient conditions. This flexible and processable film exhibited versatile applications in multi‐color afterglow displays, ultraviolet detection, multilevel information encryption, etc. Our study not only provides a strategy for the rational regulation of UOP colors but also expands the application potential of color‐tunable UOP materials.This article is protected by copyright. All rights reserved

Achieving Colorful Ultralong Organic Room-Temperature Phosphorescence by Precise Modification of Nitrogen Atoms on Phosphorescence Units

“…Phosphorescence color tuning is a hot topic in the field of UORTP. − Generally, phosphorescence properties − (including color, lifetime, and quantum yield) should closely depend on the molecular structure of the Phosphorescence Unit , molecular structures of phosphorescence molecules − (such as the donor–acceptor structure) constructed with the Phosphorescence Unit , and intermolecular interactions between the Phosphorescence Unit and matrix. Bd and BCz-1 give out (photoactivated) orange ultralong phosphorescence , in a PMMA film at room temperature; BCz, N-1 and N-2 ,, all emit (photoactivated) green ultralong phosphorescence in a PMMA film at room temperature.…”

Functionalized tails influence photoluminescence emissions for advanced applications in the fiel of time-resolved information input and erasure

“…Especially for these ultralong RTP materials, 27,51,57 advanced applications have been pushed into many different fields. Herein, an “excitation-time lock” Morse code 59,60 for information encryption is fabricated from Cz–C 7 –COOH and Cz–C 8 –Tu. As we know, a Morse code signal has two wavelengths, dots or dit sounds and dashes or dah sounds.…”

Simultaneously enhancing organic phosphorescence quantum yields and lifetimes for triphenylphosphine salt doped polymer films

“…25–29 Particularly, polyvinyl alcohol (PVA) emerges as a promising host matrix due to its water solubility and flexibility, which promote low-cost and eco-friendly processing. 25–27,30–33 However, a challenge arises as most guest molecules are oil-soluble and tend to undergo phase separation at high doping concentrations in the PVA matrix. 30–33 Therefore, developing hydrophilic guest molecules that can integrate effectively into a PVA matrix with persistent RTP properties is of crucial importance.…”

“…25–27,30–33 However, a challenge arises as most guest molecules are oil-soluble and tend to undergo phase separation at high doping concentrations in the PVA matrix. 30–33 Therefore, developing hydrophilic guest molecules that can integrate effectively into a PVA matrix with persistent RTP properties is of crucial importance.…”