Multistimuli and fingertip-triggered luminescence switching: a five-colored ink-free rewritable secured platform with strongest red emission

Abstract

Strategic design to develop highly sensitive stimuli-responsive photoluminescence (PL)-switching materials are vastly preferred but hard to achieve. This work describes the design and straightforward economical synthesis of small, conformationally-twisted, and...

Mechanofluorochromism of (D–π–)2A-type azine-based fluorescent dyes

“…In particular, the intermolecular MFC (inter-MFC) based on reversible changes in molecular orientation and arrangement of dye molecules is superior in durability to the intramolecular MFC (intra-MFC) based on reversible changes in the chemical structures of dye molecules by cleavage and reconstruction of chemical bonds during the grinding–heating process, and thus, the inter-MFC is expected to be applicable to rewritable photoimaging and electroluminescence devices. 8–70 Among various types of fluorescent dyes possessing the mechanofluorochromic properties, donor–π–acceptor (D–π–A)-type fluorescent dyes composed of an electron-donating moiety (D) and an electron-withdrawing moiety (A) connected by a π-conjugated bridge exhibit intense photoabsorption and fluorescence emission properties based on the intramolecular charge transfer (ICT) excitation from the D moiety to the A moiety. 11–33 Thus, the dipole moments as well as photoabsorption ( i.e.…”

“…8–70 Among various types of fluorescent dyes possessing the mechanofluorochromic properties, donor–π–acceptor (D–π–A)-type fluorescent dyes composed of an electron-donating moiety (D) and an electron-withdrawing moiety (A) connected by a π-conjugated bridge exhibit intense photoabsorption and fluorescence emission properties based on the intramolecular charge transfer (ICT) excitation from the D moiety to the A moiety. 11–33 Thus, the dipole moments as well as photoabsorption ( i.e. , color) and fluorescence emission ( i.e.…”

Flanking-donor-controlled diversity in mechanical-force-induced reversible fluorochromism and enhanced emission for carboxylic acid and ester linked solid-state emitters

“…25 Recently, we introduced unsymmetrically substituted smaller anthracenyl π-conjugates as solid-state emitters with sensitive MFC behavior. 26 However, the distinct MFC behavior observed in previously reported –COOH/–COOR linked molecules (Fig. 1) inspired us to investigate the MFC/PIEE responses of anthracenyl π-conjugates linked to a carboxylic ester or acid moiety.…”

Tunable Thermofluorochromic Sensors Based on Conjugated Polymers

“…Inherent thermofluorochromic materials involve thermoresponsive molecular dyes, [ 14–20 ] quantum dots, and lanthanide‐doped nanoparticles, [ 21 ] conjugated polymers, [ 22 ] or polymorphic dyes. [ 23 , 24,25 ] Even though several reports of the materials are available nowadays, their wide range of temperature responses and limited tunability of the color emission and/or switching temperature still hamper their complete implementation in commercial applications.…”