Temporal Characteristics of Afterglow in Artificial Opalстатья
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Дата последнего поиска статьи во внешних источниках: 16 января 2019 г.
Аннотация:We report the results of an experimental study of the temporal response of the artificial opal luminescence excited by UV pulses from a nitrogen laser at room temperature, liquid-nitrogen temperature, and in the intermediate range. While the response time does not exceed 15 ns at room temperature, the afterglow at liquid-nitrogen temperature was detected with a decay time of about 700 ms. We have revealed that the afterglow appears suddenly with just millisecond-range duration at a definite temperature of 130 +/- 5 K. The temperature dependence of the afterglow is of importance for the explanation of surprising effects of the stimulated emission in a single nano-sized SiO2 globule and the second harmonic generation in the material at liquid-nitrogen temperature.