Details

Autor(en) / Beteiligte

• Koughia, C.
• Kasap, S. O.

Titel

Excitation diffusion due to photon trapping in GeGaSe glasses heavily doped with Er3

Ist Teil von

• Journal of materials science. Materials in electronics, 2009, Vol.20 (Suppl 1), p.139-143

Ort / Verlag

Boston: Springer US

Erscheinungsjahr

2009

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The photoluminescence (PL) in erbium doped GeGaSe glasses with stoichiometric composition Ge 28 Ga 6.2 Se 64.5 S 0.8 :Er 0.5 has been investigated in bulk samples and coarse and fine powders with varying average particle size 〈 L 〉. The shape of PL spectra and PL decay time are found to depend strongly on 〈 L 〉 at large 〈 L 〉 ≥ 500 μm. In fine powders with 〈 L 〉 ≤ 200 μm the PL decay time does not depend on 〈 L 〉 and is very close to the theoretical calculation of the lifetime using the Judd–Ofelt theory. In addition, the PL spectra do not depend on 〈 L 〉 ≤ 200 μm, and the shape of spectra closely follows the predictions of McCumber theory. The 〈 L 〉-independent decay time values and PL spectra are observed only in fine powders with 〈 L 〉 ≤ 200 μm.