Mechanoluminescence or Room‐Temperature Phosphorescence: Molecular Packing‐Dependent Emission Response

Abstract

Mechanoluminescence (ML) and room‐temperature photophosphorescence (RTP) were achieved in polymorphisms of a triphenylamine derivative with ortho‐substitution. This molecular packing‐dependent emission afforded crucial information to deeply understand the intrinsic mechanism of different emission forms and the possible packing–function relationship. With the incorporation of solid‐state 13C NMR spectra of single crystals, as well as the analysis of crystal structures, the preferred packing modes for ML and/or RTP were investigated in detail, which can guide the reasonable design of organic molecules with special light‐emission properties.

Stimuli‐Responsive Purely Organic Room‐Temperature Phosphorescence Materials

“…Mechanicala ction sometimes results in electric action (piezoelectricity or triboelectrification). [28] When the crystal is broken, the crack surface is charged,a nd the electronic dischargeo nt he crack surfacei nduces the excited state of the compound and leads to bright showing deep blue emission (right). m) Scheme showing the mechanophosphorescence of 1u pon scratching with ametal spatula under ambientconditions in the dark.…”

“…In 2019, the same group designeda nother compound named TPA-o-3COOMe ( Figure 9a). [28] This molecule has phenyl units that can easily rotate,w hich allows it to form two different crystals. Crystal Ae xhibits visibleR TP butd oes not show ML property,w hile crystal Bi sM L-active withoutv isible RTP (Figure 9b and 9c).…”

Enhanced Long Persistent Luminescence by Multifold Interpenetration in Metal–Organic Frameworks

“…According to the literature,f actors such as hydrogen bonds and molecular packing both have great influence on luminescence properties even in the same molecule. [43,44] As shown in Figures S10 and S11ofthe Support- These unique interactions might result in intensified orbital overlap, longert riplet lifetime, and the longest-wavelength phosphorescence spectra for LIFM-WZ-11. This affords potentialf or displays, decoration, anticounterfeiting, and other related applications,a ss hown by the illustrative sea horse and dolphin LPL patterns made of LIFM-WZ-11a nd LIFM-WZ-12 powders after turning off the UV flashlight (insets in Figure 3c).…”

The Aggregation Regularity Effect of Multiarylpyrroles on Their Near‐Infrared Aggregation‐Enhanced Emission Property

“…[37] Li et al explored the effects of molecular packing and different morphologies on emission behavior. [38][39][40][41] Ta ng andZ hao synthesized a series of pyridinium-functionalizedT PE salts that had different alkyl chains. The length of the chain had little influence on the opticalp ropertiesi ns olutiond ue to the similar electronic structure, but different hydrophobicities in aqueous media affected the aggregate morphology, leadingt od iversee mission behaviors.…”