Charge Transfer States of Transition Metal and Rare Earth Ions: Their Role in Recombination Processes

Godlewski, M.

doi:10.12693/aphyspola.84.849

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1993

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“…There, the carrier trapping proceeds via the extended excited state of the RE ion (charge transfer state [11]), which is the lowest excited state of the Eu 2 + ion in the ZnS [8]. Thus, carrier trapping by the ionized RE ion can be followed by either Eu core emission or by the socalled localized bound exciton emission [11]. The relevant importance of these two recombination processes is analyzed in this paper.…”

Section: Introductionmentioning

confidence: 99%

Rare-Earth Excitation Mechanism in Wide Band Gap H-VI Compounds

Karpińska¹,

Świątek²,

Godlewski³

et al. 1993

Acta Phys. Pol. A

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The excitation mechanism of rare-earth emission in Eu and Ce doped CaS and SrS is studied. It is proposed that the Εu and probably also Ce emission is induced by the photoionization transition of the rare-earth ion, which is followed by the carrier trapping via the excited state of the ion. At increased temperatures the efficiency of excitation is reduced. We explain this effect by the carrier emission from the excited core state of the rare-earth ion to the continuum of the conduction (valence) band states. It is also suggested that the charge transfer state of the rare-earth ion may act as the intermediate state in the carrier trapping.

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Section: Introductionmentioning

confidence: 99%