Optical functions and time-resolved luminescence of lithium hydride single crystals upon far-ultraviolet excitation / Pustovarov V. A.,Ogorodnikov I. N.,Kirm M. // OPTICAL MATERIALS. - 2014. - V. 38, l. . - P. 97-101.

ISSN/EISSN:

0925-3467 / 1873-1252

Type:

Article

Abstract:

Low-temperature reflection spectra of lithium hydride (LiH) single crystals cleaved in ultrahigh vacuum (3 x 10(-10) Torr T = 10 K), were recorded using synchrotron radiation in vacuum ultraviolet spectral region. Based on the obtained experimental data, the optical functions of LiH in the energy range from 3.7 to 35 eV were analyzed using the Kramers-Kronig relations. Time-resolved photoluminescence excitation spectra were studied in detail for the near edge free exciton-phonon luminescence at 4.67 eV and photoluminescence at 2.4 eV due to the Bi3+ impurity centers. The effect of multiplication of electronic excitations due to inelastic scattering of hot photoelectrons and hot photoholes was revealed at photon energies above 15 eV (more than 3E(g)). It was found that the radiative lifetime for free excitons in LiH at 4.67 eV is less than 1 ns as low temperatures as at 10 K. The interpretation of the electronic band structure of lithium hydride in the ultraviolet and vacuum ultraviolet spectral regions were carried out on the basis of the present experimental results with the involvement of the available band structure calculations. (C) 2014 Elsevier B.V. All rights reserved.

Author keywords:

Lithium hydride - LiH; Reflection spectra; Luminescence excitation spectra; Vacuum ultraviolet; Ultra high vacuum ALKALI-HALIDE CRYSTALS; ELECTRONIC EXCITATIONS; SYNCHROTRON-RADIATION; REFLECTION SPECTRA; BOUND EXCITONS; LIH; MULTIPLICATION; SPECTROSCOPY; RANGE

DOI:

10.1016/j.optmat.2014.10.006

Web of Science ID:

ISI:000346228800018

Соавторы в МНС:

Другие поля

Поле	Значение
Month	DEC
Publisher	ELSEVIER SCIENCE BV
Address	PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Language	English
EISSN	1873-1252
Keywords-Plus	ALKALI-HALIDE CRYSTALS; ELECTRONIC EXCITATIONS; SYNCHROTRON-RADIATION; REFLECTION SPECTRA; BOUND EXCITONS; LIH; MULTIPLICATION; SPECTROSCOPY; RANGE
Research-Areas	Materials Science; Optics
Web-of-Science-Categories	Materials Science, Multidisciplinary; Optics
Author-Email	vpustovarov@bk.ru i.n.ogorodnikov@gmail.com
ResearcherID-Numbers	Kirm, Marco/M-1533-2016 Ogorodnikov, Igor/B-4162-2011
ORCID-Numbers	Kirm, Marco/0000-0002-1833-6894 Ogorodnikov, Igor/0000-0002-4700-2340
Funding-Acknowledgement	laboratory HASYLAB DESY {[}II-20110843]; Ministry of Education and Science of Russian Federation; Estonian Ministry of Education and Research {[}IUT 2-26]
Funding-Text	The authors are grateful to Prof. S.O. Cholakh for supporting of this study and help in the crystals growth. The work was partially supported by the laboratory HASYLAB DESY (Project No. II-20110843), Ministry of Education and Science of Russian Federation (the basic part of the government mandate) and by institutional research funding (IUT 2-26) of the Estonian Ministry of Education and Research.
Number-of-Cited-References	22
Usage-Count-Last-180-days	1
Usage-Count-Since-2013	8
Journal-ISO	Opt. Mater.
Doc-Delivery-Number	AW4CK