Light induced charge transfer processes in Cr doped Bi12GeO20 and Bi12SiO20 single crystals期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Light induced charge transfer processes in Cr doped Bi₁₂GeO₂₀ and Bi₁₂SiO₂₀ single crystals

Authors:	W. Wardzyński H. Szymczak K. Pataj T. łukasiewicz J. Zmija

Affiliation:	Institute of Physics, Polish Academy of Sciences, Warsaw, Poland;Military Academy of Technology, Warsaw, Poland

Abstract:	Optical absorption and ESR spectra of Bi₁₂GeO₂₀ doped with Cr were measured before and after illumination with visible light. It was found that Cr⁴⁺ ions in tetrahedral position are responsible for light induced ESR and optical spectra. The g-factor of the center is 1.945 ± 0.002. Crystal field parameters for the Cr⁴⁺ center are D_q = 820 cm^?1 and B = 429cm^?1. The photochromic effect is explained in terms of a Cr⁵⁺?Cr⁴⁺ charge transfer process.

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