Ga2O3 nanofibers with tunable crystallinity were synthesized by a readily controllable electrospinning method. Annealing treatments at different temperatures were applied to the nanofibers. As the annealing temperature (T-h) was increased from 450 to 750 degrees C, the annealed products exhibited a phase transition from amorphous structure to well-crystallized beta-Ga2O3, together with change in their morphology. Photoluminescence (PL) properties of these nanofibers were investigated. Degree of crystallinity of the resulting products, tuned by varying the annealing temperature, was found to have a great impact on their PL performance. The PL spectrum of the obtained amorphous Ga2O3 nanofibers had a broad profile with an intense peak corresponding to yellow emission, whose intensity was significantly higher than that of well-crystallized beta-Ga2O3 nanofibers. Such high yellow emission observed in the amorphous nanofibers might be attributed to both their highly disordered structure and the defects inside the fibers, resulting from the low-temperature annealing procedure. Compared to previous studies, where yellow emissions were only achieved by doping in Ga2O3 materials, the approach to enhancing visible emissions of Ga2O3 nanofibers by adjusting the annealing temperature in the present work is simple and convenient. These findings also suggest the possibility of realizing high emission in the visible range for other similar materials following the similar strategy. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

• Journal: Ceramics International
• Volume: 42
• Issue: 5
• Pages: 6467-6474
• ISSN: 0272-8842
• DOI: 10.1016/j.ceramint.2015.12.105
• Year: 2016
• Number:
• Type: