Cyril Koughia

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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)
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)
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