Efficient blue luminescence from HfO2 colloidal nanocrystals
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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