Energy transfer in pure and rare-earth doped SrAlF5 crystals / Omelkov S. I.,Kirm M.,Pustovarov V. A.,Isaenko L. I. // . - 2010. - V. 15, l. .

ISSN/EISSN:

1757-8981 / нет данных

Type:

Proceedings Paper

Abstract:

This paper reports the results of investigation of luminescence and energy transfer processes in pure and Ce-, Gd-doped SrAlF5 single crystals by means of time-resolved UV-VUV and XUV luminescence spectroscopy. Reliable evidence of self-trapped exciton (STE) formation was found. The complexity of STE emission and excitation bands points to the presence of several non-equivalent sites where excitons can localize. At temperatures above similar to 150 K the STE emission is quenched, probably due to higher mobility and increasing probability of their interaction with defects. The role of the energy transfer of Ce3+ ions with lattice defects at different temperatures is discussed. For Gd3+:SrAlF5 crystal no effective direct excitation of the characteristic 3.97 eV Gd3+ emission was found. Instead, a new PL band at 5.6 eV was revealed, which can be excited through S-8(7/2) - (6)G transitions in the 4f(7) configuration of Gd3+. This phenomenon is tentatively explained by high probability of energy transfer from gadolinium to nearby defects. However, efficient excitation of the characteristic Gd3+ emission in the range of 7-11 eV points to resonant energy transfer from growth defects to the dopants in the same manner as proposed for Ce3+, and this process populates directly the P-6(7/2) level of Gd3+ from which emission takes place.

Author keywords:

LUMINESCENCE SPECTROSCOPY; EXCITATION; IONS

DOI:

10.1088/1757-899X/15/1/012011

Web of Science ID:

ISI:000315348600011

Соавторы в МНС:

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Другие поля

Поле	Значение
Booktitle	11TH EUROPHYSICAL CONFERENCE ON DEFECTS IN INSULATING MATERIALS (EURODIM 2010)
Series	IOP Conference Series-Materials Science and Engineering
Note	11th Europhysical Conference on Defects in Insulating Materials (EURODIM), Univ Pecs, Inst Phys, Pecs, HUNGARY, JUL 12-16, 2010
Organization	Res Inst Solid State Phys \& Opt
Publisher	IOP PUBLISHING LTD
Address	DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND
Language	English
Article-Number	012011
Keywords-Plus	LUMINESCENCE SPECTROSCOPY; EXCITATION; IONS
Research-Areas	Materials Science
Web-of-Science-Categories	Materials Science, Multidisciplinary
Author-Email	omelkovs@mail.ru
ResearcherID-Numbers	Isaenko, Ludmila/H-7620-2013 Kirm, Marco/M-1533-2016 Isaenko, Ludmila/A-5272-2014
ORCID-Numbers	Kirm, Marco/0000-0002-1833-6894
Funding-Acknowledgement	RFBR {[}07-02-00442]; Estonian Science Foundation {[}8306]; European Commission FP7 {[}226716]
Funding-Text	This work was supported by RFBR ( grant 07-02-00442) and Estonian Science Foundation ( grant 8306), the SR studies by European Commission ( FP7/2007-2013, 226716). S. I. Omelkov acknowledges gratefully the Archimedes Foundation ( Estonia, DoRa5 program) for a stipend supporting his Ph.D. studies. Authors are grateful to E. Feldbach and S. Vielhauer for the help with TSL and XUV studies, numerous discussions and valuable comments on the manuscript.
Number-of-Cited-References	15
Usage-Count-Since-2013	5
Doc-Delivery-Number	BDW55