Electrospun LaOCl:Eu3+, Ce4+ nanofibers with color-tunable fluorescence between red and orange

The color-tunable fluorescent LaOCl:Eu3+, Ce4+ nanofibers were successfully fabricated via an electrospinning combined with calcination route, in which PVA was employed as a template. XRD, TG-DTG results show that the heat-treatment of the nanofibers at 750 degrees C is enough to obtain highly crystallized LaOCl:Eu3+, Ce4+ samples. Scanning electron microscopy analysis indicates that LaOCl: Eu3+, Ce4+ nanofibers are composed of wafer nanograins with mean diameter of similar to 30 nm. Photoluminescence analysis shows that the luminescence intensity has changed with the varying Ce4+ doping content in LaOCl:Eu3+ nanofibers. Additionally, CIE chromaticity coordinates of LaOCl:5% Eu3+, x% Ce4+ nanofibers change from orange light region of (0.4997, 0.4828) and (0.5232, 0.4627) at x = 5.0 and 2.5 to red light region of (0.5661, 0.4251) at x = 1.7, then to orange light region of (0.5590, 0.4318) at x = 1.0, respectively. Hence the fluorescence color of LaOCl:Eu3+, Ce4+ nanofibers can be tuned by simply adjusting the Eu/Ce ratio, which is a promising candidate for application in LEDs.