Time-Resolved Luminescence of Defects and Cr3+ Impurity Centers in Nanosized Alumina Crystals under Vacuum-Ultraviolet Excitation / Pustovarov V. A.,Kortov V. S. // TECHNICAL PHYSICS LETTERS. - 2012. - V. 38, l. 6. - P. 511-515.

ISSN/EISSN:

1063-7850 / нет данных

Type:

Article

Abstract:

The photoluminescence (PL) of intrinsic defects and Cr3+ impurity centers in nanosized alumina (Al2O3) crystals of various phase compositions (delta + theta and alpha phases) has been studied by the method of time-resolved spectroscopy with vacuum-ultraviolet (VUV) excitation at T = 7.5 and 295 K. It is established that the PL excitation spectrum and its kinetic parameters for alpha-Al2O3 phase can change depending on the crystal grain size. In alpha-Al2O3 samples with grain sizes below 100 nm, excitons localized on Cr3+ impurity centers and surface-modified defects of the crystal structure are observed even at T = 295 K. Manifestations of these exciton states in the PL spectra strongly depend on the grain size. DOI: 10.1134/S1063785012060132

Author keywords:

SYNCHROTRON-RADIATION; AL2O3

DOI:

10.1134/S1063785012060132

Web of Science ID:

ISI:000306130100006

Соавторы в МНС:

Другие поля

Поле	Значение
Month	JUN
Publisher	MAIK NAUKA/INTERPERIODICA/SPRINGER
Address	233 SPRING ST, NEW YORK, NY 10013-1578 USA
Language	English
Keywords-Plus	SYNCHROTRON-RADIATION; AL2O3
Research-Areas	Physics
Web-of-Science-Categories	Physics, Applied
Author-Email	pva@dpt.ustu.ru
Funding-Acknowledgement	federal program ``Production of Nanosystems and Nanomaterials{''} {[}02.513.11.3216]; HASYLAB (DESY) Laboratory {[}1-20110050]
Funding-Text	This study was supported in part within the framework of the federal program ``Production of Nanosystems and Nanomaterials{''} (project no. 02.513.11.3216) and the HASYLAB (DESY) Laboratory (project no. 1-20110050).
Number-of-Cited-References	13
Usage-Count-Since-2013	10
Journal-ISO	Tech. Phys. Lett.
Doc-Delivery-Number	970LJ