Figure 4 | Scientific Reports

Figure 4

From: Plasmon-photon conversion to near-infrared emission from Yb3+: (Au/Ag-nanoparticles) in tungsten-tellurite glasses

Figure 4

(a) Direct, indirect and Urbach energies (Edir, Eindir and EU, respectively) calculated for each studied sample. Lines are guides to the eye. (b) Proposed energy band diagram (Edir is an electron-hole recombination that results in photon emission, whereas Eindir free electrons have an indirect recombination that results in a low photon emission). Here is the multiphonon relaxation energy.

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