@article{oai:soar-ir.repo.nii.ac.jp:00012526,
 author = {Itoh,  Minoru and Aoki,  Tomonori},
 issue = {4},
 journal = {Journal of physics. Condensed matter},
 month = {Feb},
 note = {Time-resolved luminescence spectra of oriented PbWO₄ crystals have been measured for polarizations with the electric vector parallel to the crystallographic c axis ( E ∥ c) and perpendicular to it (E ⊥ c). All the three emission bands (I, II and III) due to the Jahn-Teller split states of a self-trapped exciton (STE) located on the (WO₄)²⁻ complex anion are found to exhibit significant polarizations in the ac plane. The main band II peaking at 425 nm is polarized with E ∥ c at low temperatures (T < 100 K), but changes its polarization from E ∥ c to E ⊥ c at T > 150 K. Band III at 450 nm is polarized with E ⊥ c at T = 230 and 300 K. The degree of polarization of these two bands does not depend on the polarization of excitation light. On the other hand, band I at 407 nm is polarized with E ⊥ c ( E ∥ c) under the photoexcitation polarized parallel (perpendicular) to the c axis, in the temperature range of T = 150-300 K. The observed polarization characteristics of three emission bands invoke further lowering of symmetry of tetrahedral (WO₄)²⁻ ions due to the uniaxially compressive crystal field, in addition to the Jahn-Teller distortion. The sublevels of the STEs responsible for the PbWO₄ luminescence are assigned on the basis of a group-theoretical consideration., Article, Journal of physics. Condensed matter. 22(4):045503 (2010)},
 pages = {1--10},
 title = {Observation of polarized luminescence from Jahn-Teller split states of self-trapped excitons in PbWO₄ by time-resolved spectroscopy},
 volume = {22},
 year = {2010}
}