Excited State Absorption and Thermoluminescence in Ce and Mg Doped Yttrium Aluminum Garnet

• Authors: K. Wiśniewski , Cz. Koepke , A. Wojtowicz , W. Drozdowski , M. Grinberg , S. Kaczmarek , J. Kisielewski
• Languages of publication: EN

Abstracts

EN

In this paper we report preliminary results of optical studies on Y_{3}Al_{5}O_{12} (YAG) crystals codoped with Ce and Mg. By using measurements of luminescence, absorption, and luminescence excitation spectra we demonstrate that although the basic features introduced to the YAG host by the Ce-doping remain intact, the Mg-codoping imposes some significant changes on other properties of the material. These changes are potentially important for laser and/or scintillator applications of YAG:Ce and are due, most likely, to modifications of defect populations in the material. We characterize them by using the techniques of thermoluminescence and excited state absorption under excimer laser pumping. These techniques, interestingly, yield results that seem inconsistent. While the thermoluminescence signal of the Mg-doped sample is strongly reduced, suggesting that trap concentrations in the presence of Mg are suppressed, the excited state absorption signal, which we also relate to the traps, is higher. We offer a tentative explanation of this contradiction between the two experiments that involves a massive transfer of electrons from the Mg-related defects to the excited state absorption centers caused by the excimer pump itself.

Keywords

EN

78.55.Hx; 78.55.-m; 78.60.Kn; 73.50.Gr; 29.40.Mc; 78.20.-e; 78.20.Wc; 78.40.-q

Discipline

• 78.60.Kn: Thermoluminescence
• 78.55.-m: Photoluminescence, properties and materials(for time resolved luminescence, see 78.47.jd)
• 78.40.-q: Absorption and reflection spectra: visible and ultraviolet(for infrared spectra, see 78.30.-j; for optical spectra of superconductors, see 74.25.nd; for time resolved reflection spectroscopy, see 78.47.jg; for multiphoton absorption, see 79.20.Ws in impact phenomena)
• 78.20.-e: Optical properties of bulk materials and thin films(for optical properties related to materials treatment, see 81.40.Tv; for optical materials, see 42.70-a; for optical properties of superconductors, see 74.25.Gz; for optical properties of rocks and minerals, see 91.60.Mk; for optical properties of specific thin films, see 78.66.-w)
• 29.40.Mc: Scintillation detectors
• 73.50.Gr: Charge carriers: generation, recombination, lifetime, trapping, mean free paths
• 78.55.Hx: Other solid inorganic materials

• Journal: Acta Physica Polonica A
• Year: 1999
• Volume: 95
• Issue: 3
• Pages: 403-412

Dates

published

1999-03

received

1998-09-16

(unknown)

1999-01-29

Contributors

author

K. Wiśniewski

• Institute of Physics, Nicholas Copernicus University, Grudziądzka 5/7, 87-100 Toruń, Poland

author

Cz. Koepke

• Institute of Physics, Nicholas Copernicus University, Grudziądzka 5/7, 87-100 Toruń, Poland

author

A. Wojtowicz

• Institute of Physics, Nicholas Copernicus University, Grudziądzka 5/7, 87-100 Toruń, Poland

author

W. Drozdowski

• Institute of Physics, Nicholas Copernicus University, Grudziądzka 5/7, 87-100 Toruń, Poland

author

M. Grinberg

• Institute of Experimental Physics, Gdańsk University, Wita Stwosza 57, 80-952 Gdańsk, Poland

author

S. Kaczmarek

• Institute of Optoelectronics, Military University of Technology, 01-489 Warsaw, Poland

author

J. Kisielewski

• Institute of Electronic Materials Technology, 01-919 Warsaw, Poland

Identifiers

DOI

10.12693/APhysPolA.95.403