Electronic Excitation Energy Transfer and Nonstationary Processes in KH2PO4:Tl Crystals / Ogorodnikov I. N.,Pustovarov V. A. // JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS. - 2017. - V. 124, l. 4. - P. 592-603.

ISSN/EISSN:

1063-7761 / 1090-6509

Type:

Article

Abstract:

We report the results of our experimental study and numerical simulation of the electronic excitation energy transfer to impurity centers under conditions where nonstationary processes take place in the hydrogen sublattice of potassium dihydrogen phosphate (KH2PO4) single crystals doped with mercury-like Tl+ ions (KDP:Tl). We present the experimental results of our investigation of the decay kinetics of the transient optical absorption (100 ns-50 s) of intrinsic defects in the hydrogen sublattice of KDP:Tl obtained by pulsed absorption spectroscopy and the results of our study of the dynamics of the change in steady-state luminescence intensity with irradiation time (1-5000 s). To explain the transfer of the energy being released during electron recombination involving intrinsic KDP:Tl lattice defects, we formulate a mathematical model for the transfer of this energy to impurity Tl+ luminescence centers. Within the model being developed, we present the systems of differential balance equations describing the nonstationary processes in the electron subsystem and the hydrogen sublattice; provide a technique for calculating the pair correlation functions Y(r, t) of dissimilar defects based on the solution of the Smoluchowski equation for the system of mobile hydrogen sublattice defects; calculate the time-dependent reaction rate constants K(t) for various experimental conditions; and outline the peculiarities and results of the model parametrization based on our experimental data. Based on our investigation, the dramatic and significant effect of a gradual inertial increase by a factor of 50-100 in steady-state luminescence intensity in the 4.5-eV band in KDP:Tl crystals due to the luminescence of mercury-like Tl+ ions has been explained qualitatively and quantitatively.

Author keywords:

SELF-TRAPPED EXCITONS; OPTICAL-ABSORPTION; SPIN-RESONANCE; SYNCHROTRON EXCITATION; IRRADIATED KH2PO4; LUMINESCENCE; SPECTROSCOPY; CENTERS; KDP; POTASSIUM

DOI:

10.1134/S1063776117030050

Web of Science ID:

ISI:000402066800008

Соавторы в МНС:

Другие поля

Поле	Значение
Month	APR
Publisher	MAIK NAUKA/INTERPERIODICA/SPRINGER
Address	233 SPRING ST, NEW YORK, NY 10013-1578 USA
Language	English
EISSN	1090-6509
Keywords-Plus	SELF-TRAPPED EXCITONS; OPTICAL-ABSORPTION; SPIN-RESONANCE; SYNCHROTRON EXCITATION; IRRADIATED KH2PO4; LUMINESCENCE; SPECTROSCOPY; CENTERS; KDP; POTASSIUM
Research-Areas	Physics
Web-of-Science-Categories	Physics, Multidisciplinary
Author-Email	i.n.ogorodnikov@urfu.ru
ResearcherID-Numbers	Ogorodnikov, Igor/B-4162-2011
ORCID-Numbers	Ogorodnikov, Igor/0000-0002-4700-2340
Funding-Acknowledgement	Government of the Russian Federation {[}02.A03.21.0006]
Funding-Text	This work was supported in part within regulation no. 211 of the Government of the Russian Federation (contract no. 02.A03.21.0006, the key center of superiority ``Radiation and Nuclear Technologies{''}). We are grateful to V.Yu. Yakovlev for his help in making the measurements by pulsed absorption spectroscopy as well as to A.P. Voronov and V.I. Salo who provided the samples of KDP: Tl crystals for our studies.
Number-of-Cited-References	40
Usage-Count-Last-180-days	1
Usage-Count-Since-2013	1
Journal-ISO	J. Exp. Theor. Phys.
Doc-Delivery-Number	EV8XD