Abstract
The tunable photoluminescence (PL) property is very important for gallium nitride (GaN) nanoparticles in the application of ultraviolet and blue optoelectronic devices, while conventional methods are not so satisfactory that alternative methods for preparing GaN nanoparticles should be studied. In this paper, ultra-small and well dispersed GaN nanoparticles are fabricated through femtosecond pulse laser ablation in air, water and ethanol. For the PL spectra of GaN nanoparticles, there are no shifts in air, red shifts in water and blue shifts in ethanol compared with the intrinsic PL spectra of bulk GaN. The X-ray photoelectron spectroscopy (XPS) results demonstrate that the various PL spectra can be due to the different components inside the GaN nanoparticles, which not only have effect on the PL emissions, but also greatly influence the intensity of PL. This study validates that the ablation environment has a great adjustable effect on the properties of GaN nanoparticles.
Highlights
Material science is a discipline designed to meet specific application requirements [1]
Well-dispersed and ultra-small gallium nitride (GaN)-NPs with adjustable size and components are obtained by fs-pulsed laser ablation in liquid (PLAL) in air, water and ethanol and the uniformity of GaN nanoparticles (GaN-NPs) prepared in liquid is better
The PL emissions of GaN-NPs@ethanol and GaN-NPs@air locate at the UV region, and that of GaN-NPs@water locates in the blue region
Summary
Material science is a discipline designed to meet specific application requirements [1]. Previous studies have shown that GaN nanoparticles (GaN-NPs) inherited the excellent properties of crystalline materials, and opened up a new application prospect, such as good gas sensitivity, especially for H2 and H2S [8] They have unique advantages as luminescence probes in biological imaging, because their absorption spectra can be adjustable from UV to near-infrared and narrow luminescence spectra with accessible range wavelength that can be compared with traditional organic dyes or fluorescent proteins [9]. The main purpose is to explore the property changes of GaN-NPs in different environments, including the particles’ size, particles’ components and the optical properties This results show that fs-PLAL can prepare PL tunable GaN-NPs by varying the ablation environment, and provide a possibility for controllable GaN-NPs to be widely adjusted and applied
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