Title of article :
Rate equation modelling of erbium luminescence dynamics in erbium-doped silicon-rich-silicon-oxide
Author/Authors :
Miraj Shah، نويسنده , , Maciej Wojdak، نويسنده , , Anthony J. Kenyon، نويسنده , , Matthew P. Halsall، نويسنده , , Hang Li، نويسنده , , Iain F. Crowe، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2012
Abstract :
Erbium doped silicon-rich silica offers broad band and very efficient excitation of erbium photoluminescence (PL) due to a sensitization effect attributed to silicon nanocrystals (Si-nc), which grow during thermal treatment. PL decay lifetime measurements of sensitised Er3+ ions are usually reported to be stretched or multi exponential, very different to those that are directly excited, which usually show a single exponential decay component.
In this paper, we report on SiO2 thin films doped with Si-ncʹs and erbium. Time resolved PL measurements reveal two distinct 1.54 μm Er decay components; a fast microsecond component, and a relatively long lifetime component (10 ms). We also study the structural properties of these samples through TEM measurements, and reveal the formation of Er clusters. We propose that these Er clusters are responsible for the fast μs decay component, and we develop rate equation models that reproduce the experimental transient observations, and can explain some of the reported transient behaviour in previously published literature.
Keywords :
Lifetimes , Si-nanocrystal , Rate equations , Ion–ion interactions , Energy migration , Erbium cluster
Journal title :
Journal of Luminescence
Journal title :
Journal of Luminescence