Spectroscopic study of red-light-emitting centers in K2Al2B2O7: Fe single crystals / Ogorodnikov I. N.,Pustovarov V. A.,Yakovlev S. A.,Isaenko L. I. // OPTICAL MATERIALS. - 2013. - V. 35, l. 6. - P. 1173-1178.

ISSN/EISSN:

0925-3467 / нет данных

Type:

Article

Abstract:

We report on spectroscopic study of red-light-emitting centers in K2Al2B2O7 (KABO) single crystals containing ca. 2 ppm of Fe3+. Owing to the low Fe3+-concentration, KABO does not show noticeable absorption due to Fe3+ d-d-transitions in the visible spectral region, but it exhibits the charge-transfer (CT) UV-absorption bands O-Fe at 4.7, 5.7 and 6.5 eV. The red photoluminescence at 1.675 eV (FWHM = 0.173 eV) is due to intracenter T-4(1) ((4)G) -> (6)A(1) (S-6) transitions in Fe3+ ions. Because of partial overlapping of the fundamental absorption edge of the crystal, where mobile excitons are created, and a broad CT absorption band at 6.5 eV, the most intensive red emission occurs at 7 K upon excitation in the excitonic energy region. The presence of two nonequivalent Al2O7 clusters in KABO lattice provides two different types of red-light-emitting centers in the form of Fe3+ ion occupied the Al3+ tetrahedral site. Superposition of their luminescence bands determines both the spectrum and temperature dependence of red emission in KABO at T = 7-80 K: two bands with the ratio of intensities of ca. 2:1 are 20 meV-shifted relative to each other; two-stage thermal quenching obeys the Mott law with E-T = 9 and 20 meV. (C) 2013 Elsevier B.V. All rights reserved.

Author keywords:

Luminescence; Optical spectra; Temperature dependence; Impurity defects; KABO TIME-RESOLVED LUMINESCENCE; NONLINEAR-OPTICAL CRYSTALS; SYNCHROTRON-RADIATION; HARMONIC-GENERATION; DISORDERED LIAL5O8; CHARGE-TRANSFER; IONS; FE-3+; UV; ABSORPTION

DOI:

10.1016/j.optmat.2013.01.009

Web of Science ID:

ISI:000317879000007

Соавторы в МНС:

Другие поля

Поле	Значение
Month	APR
Publisher	ELSEVIER SCIENCE BV
Address	PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Language	English
Keywords-Plus	TIME-RESOLVED LUMINESCENCE; NONLINEAR-OPTICAL CRYSTALS; SYNCHROTRON-RADIATION; HARMONIC-GENERATION; DISORDERED LIAL5O8; CHARGE-TRANSFER; IONS; FE-3+; UV; ABSORPTION
Research-Areas	Materials Science; Optics
Web-of-Science-Categories	Materials Science, Multidisciplinary; Optics
Author-Email	i.n.ogorodnikov@gmail.com
ResearcherID-Numbers	Isaenko, Ludmila/H-7620-2013 Ogorodnikov, Igor/B-4162-2011 Isaenko, Ludmila/A-5272-2014
ORCID-Numbers	Ogorodnikov, Igor/0000-0002-4700-2340
Funding-Acknowledgement	HASYLAB DESY {[}20110843]; Siberian Branch of the Russian Academy of Sciences {[}28]
Funding-Text	The authors are very grateful to S.A. Zhurkov for his help in preparing the crystals examined. The work was partially supported by HASYLAB DESY (Project No. 20110843), and the Siberian Branch of the Russian Academy of Sciences (Grant No. 28).
Number-of-Cited-References	59
Usage-Count-Since-2013	24
Journal-ISO	Opt. Mater.
Doc-Delivery-Number	129YD