TY - JOUR
T1 - The nature of blue luminescence from natural benitoite BaTiSi3O9
AU - Gaft, Michael
AU - Nagli, L.
AU - Waychunas, G.
AU - Weiss, D.
PY - 2004/7
Y1 - 2004/7
N2 - It is proved that blue luminescence from benitoite is connected with intrinsic luminescence centers, namely isolated TiO6 octahedra. The metastable level 3T1u is the emitting level at low temperatures with a long decay time of 1.1 ms. At higher temperatures an energy level with higher radiation probability must be involved in the emission process, and this level is situated at 0.06 eV higher than the lowest level. These two levels may be connected with 3T1u level splitting or with closely spaced 3T1u and 3T2u levels. Decay time shortening and thermal quenching are connected with nonradiative decay within the TiO6 luminescence center, while energy migration does not take place at least up to room temperature.
AB - It is proved that blue luminescence from benitoite is connected with intrinsic luminescence centers, namely isolated TiO6 octahedra. The metastable level 3T1u is the emitting level at low temperatures with a long decay time of 1.1 ms. At higher temperatures an energy level with higher radiation probability must be involved in the emission process, and this level is situated at 0.06 eV higher than the lowest level. These two levels may be connected with 3T1u level splitting or with closely spaced 3T1u and 3T2u levels. Decay time shortening and thermal quenching are connected with nonradiative decay within the TiO6 luminescence center, while energy migration does not take place at least up to room temperature.
KW - Benitoite
KW - Blue luminescence
KW - TiO centers
UR - http://www.scopus.com/inward/record.url?scp=17044366119&partnerID=8YFLogxK
U2 - 10.1007/s00269-004-0407-x
DO - 10.1007/s00269-004-0407-x
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AN - SCOPUS:17044366119
SN - 0342-1791
VL - 31
SP - 365
EP - 373
JO - Physics and Chemistry of Minerals
JF - Physics and Chemistry of Minerals
IS - 6
ER -