Excitonic energy transfer to the 3d electrons ofMn2+sinCd1−xMnxTe
| Autor: | D. Leinen |
|---|---|
| Rok vydání: | 1997 |
| Předmět: | |
| Zdroj: | Physical Review B. 55:6975-6980 |
| ISSN: | 1095-3795 0163-1829 |
| DOI: | 10.1103/physrevb.55.6975 |
| Popis: | We studied the energy transfer between excitons and the 3d electrons of ${\mathrm{Mn}}^{2+}$ in ${\mathrm{Cd}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$ ${\mathrm{Mn}}_{\mathrm{x}}$ Te crystals within a Mn concentration range of 0.2\ensuremath{\leqslant}x\ensuremath{\leqslant}0.45 at T=2, 5, and 20 K by emission, excitation, and time-resolved photoluminescence measurements. Time-integrated emission spectra show a strong quenching of the ${\mathrm{L}}_{2}$ -type exciton luminescence together with a strong increase of intensity of the $^{4}$ ${\mathrm{T}}_{1}$ (G)${\ensuremath{\rightarrow}}^{6}$ ${\mathrm{A}}_{1}$ (S)${\mathrm{Mn}}^{2+}$ luminescence if the Mn concentration is raised from x=0.32 to 0.43. Excitation spectra of the $^{4}$ ${\mathrm{T}}_{1}$ (G)${\ensuremath{\rightarrow}}^{6}$ ${\mathrm{A}}_{1}$ (S) ${\mathrm{Mn}}^{2+}$ luminescence give evidence of an excitonic energy transfer via free and intrinsically localized excitons to the 3d shell of ${\mathrm{Mn}}^{2+}$ . By time-resolved photoluminescence measurements we investigated the lapse of luminescence at discrete energies in the exciton luminescence band using pulsed band-to-band excitation. The luminescence shows a nearly exponential decay. We see a strong decrease of the luminescence decay time when the ${\mathrm{Mn}}^{2+}$ ions act like energy absorbers for the exciton energies. |
| Databáze: | OpenAIRE |
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