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RESEARCH PRODUCT
Luminescence of a self-trapped exciton in GeO2 crystal
Anatoly N. Trukhinsubject
Condensed matter physicsChemistryExcitonQuantum yieldGeneral ChemistryCondensed Matter PhysicsCrystalsymbols.namesakeStokes shiftExcited stateMaterials ChemistrysymbolsAtomic physicsTriplet stateAbsorption (electromagnetic radiation)Luminescencedescription
Abstract The self-trapped exciton (STE) is discovered in the GeO2 crystal. A PL band at 2.5 eV with a strong Stokes shift is excited only in the fundamental absorption range of GeO2 crystal with the quantum yield about 0.4 and the decay time constant 800 ± 5 μs at 80 K. The PL thermal quenching occurs at 200 K with the energy about 0.25 eV and the frequency factor 107. At 4.5 K the PL decay kinetics splits into two components with time constants 270 μs and 8000 μs, which can be due to a triplet state split in the zero magnetic field. The STE in GeO2 is very similar to a STE in SiO2.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1993-02-01 | Solid State Communications |