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- Cyril Koughia, Safa O Kasap
- Optics express
- 2008

Using the photoluminescence from GeGaSe:Er to pump GeGaS:Er, we examine the efficiency of light trapping. By measuring the photoluminescence decay time in powdered materials with varying particle size, we are able to exclude the influence of light trapping and to pinpoint the effect of self-quenching. The critical concentrations of Er for efficient… (More)

- Safa Kasap, Cyril Koughia
- 2016 18th International Conference on Transparent…
- 2016

Behind the effect of radiation trapping, also known as radiation diffusion, is a series the sequential emissions and absorptions of radiation by participating atoms or ions. This effect is widely observed in glasses doped with Er<sup>3+</sup> ions where there is a significant spectral overlap of <sup>4</sup>I<sub>15/2</sub> -<sup>4</sup>I<sub>13/2</sub>… (More)

Electrical transport through materials is a large and complex field, and in this chapter we cover only a few aspects that are relevant to practical applications. We start with a review of the semi-classical approach that leads to the concepts of drift velocity, mobility and conductivity, from which Matthiessen’s Rule is derived. A more general approach… (More)

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