Positron annihilation, thermoluminescence, and optical absorption measurements were applied with the aid of several annealing and diffusion procedures to investigate the nature of point defects in (YAG) single crystals. By annealing at in air or O, and diffusing Al into a Ce doped YAG single crystal, a reduction of nearly two orders of magnitude in vacancy concentration was observed. Scintillation measurements showed a significant improvement in energy resolution after Al diffusion. This study revealed the presence of vacancy-defect complexes, most likely associated with cation antisites in YAG crystals.
REFERENCES
1.
2.
E.
Zych
, C.
Brecher
, and J.
Glodo
, J. Phys.: Condens. Matter
12
, 1947
(2000
).3.
S. R.
Rotman
and C.
Warde
, J. Appl. Phys.
58
, 522
(1985
).4.
A.
Vedda
, D.
Di Martino
, M.
Martini
, J.
Mares
, E.
Mihokova
, M.
Nikl
, N.
Solovieva
, K.
Blazek
, and K.
Nejezchleb
, Radiat. Meas.
38
, 673
(2004
).5.
W.
Hayes
, J. M.
Yamaga
, D. J.
Robbins
, and B.
Cockayne
, J. Phys. C
13
, L1085
(1980
).6.
Y.
Zorenko
, A.
Voloshinovskii
, I.
Konstankevych
, V.
Kolobanov
, V.
Mikhailin
, and D.
Spassky
, Radiat. Meas.
38
, 677
(2004
).7.
P. J.
Schultz
and K. G.
Lynn
, Rev. Mod. Phys.
60
, 701
(1988
).8.
A.
Van Veen
, H.
Schut
, J.
de Vries
, R. A.
Hakvoort
, and M. R.
Ijpma
, in Positron Beam for Solids and Surfaces
, edited by P. J.
Schultz
, G. R.
Massoumi
, and P. J.
Simpson
(AIP
, New York
, 1991
), Vol. 218
, p. 171
.9.
E.
Zych
and C.
Brecher
, J. Lumin.
90
, 89
(2000
).10.
C. D.
Brandle
and R. L.
Barns
, J. Cryst. Growth
26
, 169
(1974
).11.
V.
Lupei
, A.
Lupei
, and C.
Boulon
, Phys. Rev. B
53
, 14818
(1996
).12.
J.
Dong
and K.
Lu
, Phys. Rev. B
43
, 8808
(1991
).13.
C.
Milanese
, V.
Buscaglia
, F.
Maglia
, and U.
Anselmi-Tamburini
, Chem. Mater.
16
, 1232
(2004
).14.
M. M.
Kuklja
, J. Phys.: Condens. Matter
12
, 2953
(2000
).15.
C. R.
Stanek
, K. J.
McClellan
, M. R.
Levy
, C.
Milanese
, and R. W.
Grimes
, Nucl. Instrum. Methods Phys. Res. A
579
, 27
(2007
).16.
V.
Lupei
, Opt. Mater. (Amsterdam, Neth.)
19
, 95
(2002
).17.
I.
Kim
and J.
Kwon
, Appl. Phys. Lett.
83
, 4863
(2003
).© 2007 American Institute of Physics.
2007
American Institute of Physics
You do not currently have access to this content.
