Abstract

Time-resolved photoluminescence is used to determine carrier recombination through radiative and nonradiative processes in zinc hydroxide $\mathrm{Zn}{(\mathrm{OH})}_2$ and its porous composites with graphite oxide (GO). The decay times, measured by a streak camera, are found to be larger for zinc hydroxide ($\sim 1215\pm 156\mathrm{ps}$) than its composites ($\sim 976\pm 81\mathrm{ps}$ for ZnGO-2 and $742\pm 59\mathrm{ps}$ for ZnGO-5), but no significant changes in rise times (from 4.0 to 5.0 ps) are recorded. The dominant mechanism for the radiative process is attributed to free carrier recombination, while microporous networks present in these materials are found to be pathways for the nonradiative recombination process via multiphonon emission.

© 2013 Optical Society of America

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