TY - JOUR
T1 - Three types of emission bands from hetero-nuclear relaxed excitons in NaBr:I, KBr:I and RbBr:I
AU - Kan'no, Ken ichi
AU - Tanaka, Koichiro
AU - Kosaka, Hideo
AU - Nakai, Yoshio
N1 - Funding Information:
The authors are grateful to Professor M. Watanabe and Dr. K. Fukui of Institute for Molecular Science for their supports in lifetime measurements under the Joint Studies Program (1989) of the UVSOR Facility. This work was partially supported by the Murata Science Foundation.
PY - 1991
Y1 - 1991
N2 - Luminescence from hetero-nuclear relaxed excitons, [(BrI)-+e], has been studied under steady or pulsed UV-light excitation into the localized exciton absorption due to I- impurities in NaBr, KBr and RbBr. One, two and three emission bands were found in the respective matrices. A prominent emission band is located at 4.6 eV in NaBr:I, at 3.5 eV in KBr:I or at 2.5 eV in RbBr:I, having a largely different lifetime of 230 ns, 3.3 μs or 19 μs, respectively. Variations in the peak position and the lifetime of these three bands are very similar to those of intrinsic π emission bands from the self-trapped excitions (STE), [I-2 + e], in pure NaI, KI and RbI. Existence of three locally stable configurations responsible for emission bands is discussed in connection with the off-center shift of the VK core in the STE.
AB - Luminescence from hetero-nuclear relaxed excitons, [(BrI)-+e], has been studied under steady or pulsed UV-light excitation into the localized exciton absorption due to I- impurities in NaBr, KBr and RbBr. One, two and three emission bands were found in the respective matrices. A prominent emission band is located at 4.6 eV in NaBr:I, at 3.5 eV in KBr:I or at 2.5 eV in RbBr:I, having a largely different lifetime of 230 ns, 3.3 μs or 19 μs, respectively. Variations in the peak position and the lifetime of these three bands are very similar to those of intrinsic π emission bands from the self-trapped excitions (STE), [I-2 + e], in pure NaI, KI and RbI. Existence of three locally stable configurations responsible for emission bands is discussed in connection with the off-center shift of the VK core in the STE.
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U2 - 10.1016/0022-2313(91)90094-C
DO - 10.1016/0022-2313(91)90094-C
M3 - Article
AN - SCOPUS:0025757502
VL - 48-49
SP - 147
EP - 151
JO - Journal of Luminescence
JF - Journal of Luminescence
SN - 0022-2313
IS - PART 1
ER -