Abstract
We have investigated the effect of hydrostatic pressure (P5 GPa) on optical absorption and photoluminescence spectra of Wöhler siloxene (Si6O3H6, as prepared) at T=300 K. The absorption edge energy near 2.75 eV decreases linearly with pressure at a rate of -30 3 meV/GPa. For the position of the maximum of the green luminescence band we find a similar pressure coefficient (dE/dP=-24 3 meV/GPa). The intensity of the green luminescence shows a reversible decrease with increasing pressure. The pressure dependence of interlayer and intralayer lattice constants has been determined by x-ray powder diffraction. The observed changes in optical transition energies are discussed in the framework of a semiempirical quantum-chemical calculation of the electronic structure of siloxene.
| Original language | English |
|---|---|
| Pages (from-to) | 5362-5367 |
| Number of pages | 6 |
| Journal | Physical Review B |
| Volume | 49 |
| Issue number | 8 |
| DOIs | |
| State | Published - 1994 |
| Externally published | Yes |