Real‐Time Tunable Red/Near‐Infrared Solid‐State Emitters in the First Biological Window: 9,9‐Diethyl‐2‐diphenylaminofluorene‐Based Push‐Pull Fluorophores for Distributed Feedback and Random Lasing Applications

Abstract

In biological imaging, red‐to‐infrared emissive dyes facilitate direct visualization of molecular interactions, through deep tissue penetration, along with minimal tissue damage. This work uses simple systems based on a single dye‐doped polymeric thin film for distributed feedback and random lasing investigations. As active compounds, novel push‐pull luminescent diphenylaminofluorene derivatives are used, functionalized with different acceptor groups. Integration of such luminescent dyes with a transparent polymeric medium allows fabrication of real‐time lasing tunability in the first biological window (650–950 nm). The observed spectral tuning of 150 nm is a groundbreaking value obtained in a single‐dye system.

Thieno[3,2-b]phosphole-based AIEgens: facile preparation and dual modulation of solid-state luminescence

“…This structural modification resulted in the manifestation of intense deep red luminescence, characterized by a Φ F of 52% and a fluorescence lifetime of 4.4 ns. As a consequence, this compound stands out as one of the few highly efficient red-emitting solid-state fluorophores, 86,87 and to the best of our knowledge, it represents the most potent red-emitting phosphole derivative identified to date. The heightened efficiency of this red emitter can be ascribed to its well-defined molecular structure.…”

One- and two-photon lasing from a TCF-based AIE dye

“…15 However, despite the great interest in these compounds, the AIE effect on lasing properties is not well described yet. Some papers report on light amplification [16][17][18][19][20][21][22][23][24][25] but without general discussion on how this phenomenon can influence light enhancement. Therefore, in this article, we want to investigate how the AIE effect can affect the lasing properties of luminescent materials.…”