Multiple Luminescence Responses towards Mechanical Stimulus and Photo‐Induction: The Key Role of the Stuck Packing Mode and Tunable Intermolecular Interactions

Abstract

Organic luminescence with different forms continues to be one of the most active research fields in science and technology. Herein, an ultra‐simple organic molecule (TPA‐B), which exhibits both mechanoluminescence (ML) and photo‐induced room‐temperature phosphorescence (RTP) in the crystalline state, provides an opportunity to reveal the internal mechanism of ML and the dynamic process of photo‐induced RTP in the same molecule. Through the detailed investigation of photophysical properties together with crystal structures, the key role of molecular packing and intermolecular interactions was highlighted in the luminescence response by mechanical and light stimulus, affording efficient strategies to design potential smart functional materials with multiple luminescence properties.

A facile way to obtain near-infrared room-temperature phosphorescent soft materials based on Bodipy dyes

“…Different colours of RTP including blue-purple, green, and orange have been achieved by employing several different phosphors. 18,24,25 In order to extend the RTP emission colour to red and even the NIR region, polymers composed of acrylamide and iodine-substituted Bodipy dyes are designed in this research work. Scheme S1-S3 † present the detailed synthetic route of the phosphorescent polymers.…”

“…[9][10][11][12] In particular, great achievements have been made in preparing RTP emitting materials in the amorphous state because crystallization usually needs strict growth conditions which might restrict their development. [13][14][15][16][17][18] Amorphous polymers have been veried to be rigid enough to effectively suppress nonradiative transition and promote RTP emission. [19][20][21][22][23][24][25][26] Various phosphors with different conjugated structures have been utilized to obtain RTP emission of different colours, most of which are excited by UV light and exhibit RTP emission in the visible region.…”

“…Copolymerizing acrylamide and different phosphors has been proved to be an efficient way to immobilize the phosphors and achieve RTP of different emission colours. 18,24,25 The rigid matrix of a polyacrylamide system can protect phosphors from the quenching effect of oxygen molecules and restrict their nonradiative transition. The two polymers (p-1IBDP and p-2IBDP) in this research work display strong absorption in the visible region and moderate RTP in the NIR region with a large Stokes shi of up to 250 nm.…”

Room‐Temperature Phosphorescence Resonance Energy Transfer for Construction of Near‐Infrared Afterglow Imaging Agents

“…On the basis of our previous work, [ 20 ] an organic compound of mTPA was designed and conveniently prepared through a two‐step synthetic route (Scheme S1, Supporting Information). The target molecule was characterized by 1 H and 13 C NMR spectroscopy, mass spectroscopy, elemental analysis, and high‐performance liquid chromatogram (Figures S1–S5, Supporting Information).…”

Room‐Temperature Phosphorescence Invoked Through Norbornyl‐Driven Intermolecular Interaction Intensification with Anomalous Reversible Solid‐State Photochromism

“…[4,9,[29][30][31][32][33][34] Thee xistence of strong intermolecular interactions,f or example, p-p interactions in the aggregated state of many RTPl uminogens,c an enforce intermolecular electronic coupling and reduce nonradiative transitions from T 1 to S 0 ,which contributes to more persistent RTP ( Figure 1a). [13,16,[30][31][32][35][36][37] Tr aditionally,t his goal is mainly achieved by decorating electron-withdrawing functional groups (EWGs) on the p system to relieve the p-p repulsion or/and constructing donor-acceptor (D-A)-type molecules to increase the intermolecular electrostatic interactions or dipole-dipole interactions between neighboring p systems ( Figure 1b and Chart S1). [23,30,32,[37][38][39][40] However,c oncise yet efficient molecular design tactics to modulate the p-p interactions and molecular packing of RTPl uminogens are still needed.…”