Investigation of Luminescence from Bound Excitons in KBr:I by Using Polarized Light

概要

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The correlation of polarization between exciting and emitted lights in the luminescence due to excitons bound at I^- ions in KBr crystals has been studied at 4.2 K. In the 356 nm emission attributed to the single I^- ion center, no polarization is observed showing that the given memory of polarization is lost during the relaxation of bound exciton to the (IBr^--V_k+e)^* state to produce luminescence. In the 285 nm emission attributed to the paired I^- ion center, polarization is found indicating that the dipole responsible for the emission is oriented along the <100> direction. Two possible explanations have been presented; one is based on the strong interaction between the I^- ions and hence the D_<2h> symmetry of the paired I^- ion center, while the other assumes the weak interaction between the I^- ions and hence the nearly O_h symmetry around the I^- ion which is distorted tetragonally by the Jahn-Teller effect in the relaxed excited state.
社団法人日本物理学会の論文
1972-03-05