Layered Host–Guest Materials with Reversible Piezochromic Luminescence

Abstract

Under pressure: An anionic organic fluorophore (a stilbene derivative, BTZB) assembled into a layered double hydroxide host has reversible optical responses, including changes in absorption spectra, luminescence color, and fluorescence lifetime, on changing the external pressure (see picture). These changes are not observed for pristine BTZB.

Layered host–guest long-afterglow ultrathin nanosheets: high-efficiency phosphorescence energy transfer at 2D confined interface

“…33 a Therefore, in this work, the occurrence of H-type IPA dimers in the 2D nanosheets may correspond to the enhancement of the phosphorescence emission. 41 …”

Delaminated layered rare-earth hydroxide composites with ortho-coumaric acid: color-tunable luminescence and blue emission due to energy transfer

“…2,[4][5][6][7][8][9] The easier penetration of LDH interlayer channels has facilitated the realization of optical/chemical sensors with rapid response and recyclability. 2,10,11 Much progress has been made in the development of LDH-chromophore hybrids, [12][13][14][15][16][17][18][19][20] however, most of them focused on the luminescence property of the involved chromophores rather than the LDH hosts, because the LDH layer ions are generally not photoactive thus only serving as inorganic matrices. The synergetic effect of organic chromophores and 2D layers that hold photoactive ions such as Eu 3+ , Tb 3+ or Dy 3+ has not been established to date.…”

Layered Double Hydroxide Materials: Assembly and Photofunctionality

“…The fluorescence of the pristine BTZB and BTZB/ LDH composites is shown at approximately 452 nm, and significant luminescent changes can be observed for the BTZB/LDHs treated with pressures while pristine BTZB remains unchanged. Figure 54a shows the changes of fluorescence spectra upon increasing the pressure from 0.1 MPa to 18.8 GPa; the emission wavelength shifts from 452 to 515 nm, which can be assigned to the formation of J-type [111] aggregates in the LDH galleries. The change of this phenomenon can be obviously seen from photographs of the BTZB/LDH pellet under UV light (Fig.…”

“…) amino]-1,3,5-triazin-2-yl] amino]benzene sulfonate anion (BTZB) after intercalation into LDHs matrix [111]. The fluorescence of the pristine BTZB and BTZB/ LDH composites is shown at approximately 452 nm, and significant luminescent changes can be observed for the BTZB/LDHs treated with pressures while pristine BTZB remains unchanged.…”