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Open Access Efficient blue luminescence from HfO2 colloidal nanocrystals

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In this study, a novel sol–gel route was used to synthesize high-quality HfO2 colloidal nanocrystals. Several techniques were employed to characterize the HfO2 colloidal nanocrystals. Two excitation peaks one at 316, and other at 366 nm wavelengths were observed in absorption spectrum. Also, a strong blue light wave was emitted by the HfO2 sol. High resolution transmission electron microscopy (HR-TEM) demonstrated that the average diameter of HfO2 nanocrystals is about 5 nm. X-ray diffraction (XRD) pattern showed that the phase of HfO2 colloidal nanocrystals is orthorhombic. With use of PL measurements, we demonstrated that the quantum efficiency for HfO2 sol is 68.2% within 340 nm excitation wavelength. The observation results confirmed that the synthesized HfO2 colloidal nanocrystals with strong blue emission have enough potential for photonics applications. The mentioned optical properties are reported for the first time.
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Document Type: Research Article

Publication date: February 1, 2017

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  • Materials Express is a peer-reviewed multidisciplinary journal reporting emerging researches on materials science, engineering, technology and biology. Cutting-edge researches on the synthesis, characterization, properties, and applications of a very wide range of materials are covered for broad readership; from physical sciences to life sciences. In particular, the journal aims to report advanced materials with interesting electronic, magnetic, optical, mechanical and catalytic properties for industrial applications.
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