Examines energy levels and photoluminescence in Er doped a-Si:H, suggesting environmental impact on spectral properties.
The crystal-field potential at the Er3+ ion surrounded by six oxygen ions is expanded in terms of polynomials. After converting it into equivalent angular momentum operators, the Stark-splitting of the 4I15/2 ground state of the Er3+ ion is calculated. Influence of the change in the environment of the Er3+ ion on the shift of the energy levels is investigated and compared with the observed Er photoluminescence spectrum in a-Si:H. The scattering of the calculated energy levels by the structural fluctuation around the Er 3+ ion is also compared with the linewidth of the component photoluminescence lines.
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久米田 et al. (2007) studied this question.
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