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Figure 1 | Nanoscale Research Letters

Figure 1

From: Magnetic field dependence of singlet oxygen generation by nanoporous silicon

Figure 1

Photoluminescence of porous silicon containing a low concentration of molecular oxygen. Photoluminescence (PL) spectra of a porous silicon sample exposed to a small quantity of oxygen gas are shown for magnetic fields of 0 to 6 T. The sample was held in superfluid helium at 1.5 K, and the PL was excited with 450-nm (2.76 eV) continuous wave excitation. The vertical dashed line indicates the threshold energy, above which photoexcited excitons in the silicon nanoparticles have sufficient energy to excite the adsorbed oxygen from its triplet 3Σ to its singlet 1Σ state.

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