Dominant ultraviolet-blue photoluminescence of ZnO embedded into synthetic opal |
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Authors: | S.M. Abrarov Sh.U. Yuldashev S.B. Lee T.W. Kang |
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Affiliation: | a Quantum-functional Semiconductor Research Center, Dongguk University, Seoul 100-715, Republic of Korea b Advanced Semiconductor Research Center, Division of Electrical and Computer Engineering, Hanyang University, Seoul 133-791, Republic of Korea c Nanotechnology Institute, University of Texas at Dallas, Richardson, TX 75083, USA |
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Abstract: | The temperature-dependent photoluminescence (PL) characteristics of zinc oxide (ZnO) embedded into the voids of synthetic opal were studied. ZnO was infiltrated into opal from aqueous solution with zinc nitrate precursor followed by thermal annealing. The PL spectra of the ZnO powder exhibit very high and broad emission peaks in the green region due to crystal defects, such as oxygen vacancies and zinc ion interstitials. In contrast to the PL spectra of ZnO powder, nanocrystals of ZnO embedded into the voids of FCC packed opal matrix exhibit dominant ultraviolet (UV)-blue and rapidly decreasing green PL emissions with decreasing temperature. The temperature-dependent PL characteristics show that the green band suppression in the ZnO nanocrystals is due to the influence of photonic crystal. The infiltration of nanoparticles into synthetic opal may be used for the fabrication of polycrystalline ZnO with dominant UV-blue PL. These results indicate that the luminescent materials embedded into photonic crystal may be promising for the fabrication of the RGB pixels in full-color displays. |
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Keywords: | 78.55.&minus m 78.55.Et 42.70.Qs 82.30.Lp |
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