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Efficient Channels of Energy Transfer in High Light Yield LuI3:Ce Scintillator

Published online by Cambridge University Press:  01 February 2011

Andrey Knizhnik ,
Andrey N. Vasil'ev ,
Inna M. Iskandarova ,
Andrey V. Scherbinin ,
Igor Markov ,
Alexander A. Bagatur'yants ,
Boris Potapkin ,
Alok Srivastava ,
James Vartuli  and
Steven Duclos
Andrey Knizhnik
Affiliation:
knizhnik@kintech.ru, Kintech Lab Ltd, Moscow, Russian Federation
Andrey N. Vasil'ev
Affiliation:
anv@kintech.ru, Kintech Lab Ltd, Moscow, Russian Federation
Inna M. Iskandarova
Affiliation:
inna@kintech.ru, Kintech Lab Ltd, Moscow, Russian Federation
Andrey V. Scherbinin
Affiliation:
andrei_scherb@mail.ru, Kintech Lab Ltd, Moscow, Russian Federation
Igor Markov
Affiliation:
markov@kintech.ru, Kintech Lab Ltd, Moscow, Russian Federation
Alexander A. Bagatur'yants
Affiliation:
sasha@kintech.ru, Kintech Lab Ltd, Moscow, Russian Federation
Boris Potapkin
Affiliation:
potapkin@kintech.ru, Kintech Lab Ltd, Moscow, Russian Federation
Alok Srivastava
Affiliation:
srivastava@crd.ge.com, GE Global Research, Niskayuna, New York, United States
James Vartuli
Affiliation:
vartuli@crd.ge.com, GE Global Research, Niskayuna, New York, United States
Steven Duclos
Affiliation:
duclos@crd.ge.com, GE Global Research, Niskayuna, New York, United States
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Abstract

The extremely high scintillation efficiency of lutetium iodide doped by cerium is explained as a result of several factors controlling the energy transfer from the host matrix to activator, two of which are investigated in the present paper. The first one is the increase of the efficiency of energy transfer from self-trapped excitons to cerium ions in the row LuCl3-LuBr3-LuI3. The STE structure and the efficiency of STE to cerium energy transfer are verified by cluster ab initio calculations. We propose and theoretically validate the possibility of a new channel of energy transfer to excitons and directly to cerium, namely the Auger process when Lu 4f hole relaxes to the valence band hole with simultaneous creation of additional exciton or excitation of cerium. This process should be efficient in LuI3, and inefficient in LuCl3. In order to justify this channel we perform calculations of density of states using a periodic plane-wave density functional approach. The performed estimations theoretically justify the high LuI3:Ce3+ scintillator yield.

Keywords

lanthanideluminescenceoptical properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1111: Symposium D – Rare-Earth Doping of Advanced Materials for Photonic Applications , 2008 , 1111-D08-09
Copyright
Copyright © Materials Research Society 2009

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References

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