Shallow electron traps in alkali halide crystals: Mollwo-Ivey relations of the optical absorption bands

Valters Ziraps

doi:10.1117/12.417593

8 March 2001 Shallow electron traps in alkali halide crystals: Mollwo-Ivey relations of the optical absorption bands

Valters Ziraps

Proceedings Volume 4318, Smart Optical Inorganic Structures and Devices; (2001) https://doi.org/10.1117/12.417593
Event: Advanced Optical Materials and Devices, 2000, Vilnius, United States

Abstract

Evidences are given that two classes of the transient IR- absorption bands: (a) with max. at 0.27-0.36 eV in NaCl, KCl, KBr, KI and RbCl (due to shallow electron traps according G. Jacobs or due to bound polarons according E.V. Korovkin and T.A. Lebedkina) and (b) with max. at 0.15-0.36 eV in NaI, NaBr, NaCl:I, KCl:I, RbCl:I and RbBr:I (due to on-center STE localized at iodine dimer according M. Hirai and collaborators) are caused by the same defect- atomic alkali impurity center [M⁺]_c⁰e^- (electron e^- trapped by a substitutional smaller size alkali cation impurity [M⁺]_c⁰). The Mollwo-Ivey plots (for the transient IR-absorption bands) of the zero-phonon line energy E₀ (for NaCl, KCl, KBr, RbCl and NaBr, KCl:I) and/or the low-energy edge valued E₀ (for NaI, RbCl:I, RbBr:I) versus anion-cation distance (d) evidence that two types of the [M⁺]_c⁰e^- centers are predominant: (a) [Na⁺]_c⁰e^- in the KX and RbX host crystals with the relation E₀approximately equals 6.15/d^2.74, (b) [Li⁺]_c⁰3^- in the NaX host crystals - E₀approximately equals 29.4/d^4.72. The Mollwo-Ivey relation E₀approximately equals 18.36/d(superscript 2.70 is fulfilled as well for the F' band in NaCl, KCl, KBr, KI, RbCl, RbI if we use the F' center optical binding energy values E₀.

Citation Download Citation

Valters Ziraps "Shallow electron traps in alkali halide crystals: Mollwo-Ivey relations of the optical absorption bands", Proc. SPIE 4318, Smart Optical Inorganic Structures and Devices, (8 March 2001); https://doi.org/10.1117/12.417593

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