Deep level emission of ZnO nanoparticles deposited inside UV opal |
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| Authors: | S.M. Abrarov Sh.U. Yuldashev Y.H. Kwon |
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| Affiliation: | a Quantum-functional Semiconductor Research Center, Department of Physics, Dongguk University, 3-26 Pil-dong, Chung-ku, 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 |
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| Abstract: | The temperature-dependent photoluminescence spectra of zinc oxide (ZnO) nanocrystals deposited inside the ultraviolet (UV) opal were studied. ZnO was grown in the voids between FCC packed SiO2 spheres using spray pyrolysis under ultrasonic vibration in the solution containing a zinc nitrate precursor. The ZnO nanoparticles inside opal matrix with UV photonic band-gap exhibit suppression of the excitonic emission and enhancement of the deep level emission. Suppression of the excitonic lines is due to the inhibition of spontaneous emission, while enhancement and broadening of the DL emission in the green spectral region is due to Purcell effect. The infiltration of ZnO nanoparticles inside the photonic crystal may be a useful technique to increase its emission efficiency in the selected spectral region. |
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| Keywords: | 78.55.-m 78.55.Et 42.70.Qs 82.30.Lp |
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