A luminescence and absorption spectroscopy study of KH2PO4 crystals doped with Tl+ ions / Ogorodnikov I. N.,Pustovarov V. A.,Puzikov V. M.,Salo V. I.,Voronov A. P. // OPTICAL MATERIALS. - 2012. - V. 34, l. 9. - P. 1522-1528.

ISSN/EISSN:

0925-3467 / нет данных

Type:

Article

Abstract:

We report experimental study on luminescence and optical properties of single crystals KH2PO4 (KDP) doped with Tl+ ions (KDP:Tl) carried out at 10-480 K. The 4.5 eV photoluminescence (PL) of KDP:Tl originates from radiative electronic transitions P-3(1) -> S-1(0) in the Tl+ ions upon excitation by UV-photons, X-rays, and electron beam. This luminescence can be induced by direct photoexcitation, or through the recombination process with participation of the lattice defects located in the vicinity of Tl+ ion. These excitation mechanisms lead to different temperature behavior of the luminescence intensity. The PL excitation spectra of KDP crystals containing a small amount of the Tl+ ions (0.001-0.008 wt.\%) comprises peaks at 5.7-5.8, 6.9, and 7.3-7.4 eV, corresponding subsequently to the A-, B- and C-optical transitions in Tl+. The PL time response has single-exponential behavior with an average lifetime of tau = 280 +/- 8 ns. Under exposure to ionizing radiation (X-rays, or electron beam) the intensity of the Tl+ luminescence increases depending on the exposure time. The origin of this phenomenon was associated with creation of defects in the hydrogen sublattice of KDP. (c) 2012 Elsevier B.V. All rights reserved.

Author keywords:

Luminescence spectroscopy; Luminescent materials; Scintillation crystals; Potassium dihydrogen phosphate; Thallium ion SELF-TRAPPED EXCITONS; OPTICAL-ABSORPTION; SYNCHROTRON EXCITATION; NH4H2PO4 CRYSTALS; ADP NH4H2PO4; KDP KH2PO4; RADIATION; THALLIUM; CENTERS

DOI:

10.1016/j.optmat.2012.03.018

Web of Science ID:

ISI:000306205400005

Соавторы в МНС:

Другие поля

Поле	Значение
Month	JUL
Publisher	ELSEVIER SCIENCE BV
Address	PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Language	English
Keywords-Plus	SELF-TRAPPED EXCITONS; OPTICAL-ABSORPTION; SYNCHROTRON EXCITATION; NH4H2PO4 CRYSTALS; ADP NH4H2PO4; KDP KH2PO4; RADIATION; THALLIUM; CENTERS
Research-Areas	Materials Science; Optics
Web-of-Science-Categories	Materials Science, Multidisciplinary; Optics
Author-Email	i.n.ogorodnikov@gmail.com
ResearcherID-Numbers	Ogorodnikov, Igor/B-4162-2011
ORCID-Numbers	Ogorodnikov, Igor/0000-0002-4700-2340
Funding-Acknowledgement	HASYLAB {[}I-20110050]
Funding-Text	Authors are grateful to N.S. Mezenina for her help in conducting this study. The work was supported by HASYLAB (Project No. I-20110050).
Number-of-Cited-References	19
Usage-Count-Since-2013	10
Journal-ISO	Opt. Mater.
Doc-Delivery-Number	971LM