Journal
SOLID STATE COMMUNICATIONS
Volume 181, Issue -, Pages 9-14Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ssc.2013.11.020
Keywords
ZnO; Exciton; Photoluminescence; Nonlinear optics
Categories
Funding
- NSF [CMMI-0825737, CMMI-1056611]
- K. Keith Innes Research Grant
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1056611] Funding Source: National Science Foundation
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In this study, we characterize the relative crystal quality of zinc oxide (ZnO) synthesized at various temperatures via photoluminescence (PL) measurements. By varying the oxidation temperature during the growth process, different sample morphologies arise. These structural differences cause changes in the PL spectra which allow us to gain insight into the crystal purity. We employ three independent spectroscopic methods to examine ZnO prepared with various morphologies; time-integrated PL, random lasing, and time-resolved PL. As a result of the impurity band being resonant with the two-photon absorption (2PA) range, multifold enhanced 2PA is observed and the 2PA coefficient is measured to be 2500 cm/GW for tetrapod ZnO at 613 nm. (C) 2013 Elsevier Ltd. All rights reserved,
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