Optical studies of MWCNT doped boron carbon oxynitride (BCNO) nano composite phosphor material

摘要

The BCNO (boron carbon oxynitride) phosphors have attracted much attention due to their excellent properties like non-toxicity, tunable emission spectra and easy synthesis processes. The present work investigates structural and luminescence properties of BCNO/MWCNTs (Boron Carbon Oxy-Nitride/Multi-Walled Carbon Nanotubes) nanocomposite phosphor materials, synthesized at 750 degrees C using combustion method. Boric acid (H3BO3), Citric Acid (C6H8O7) and Urea (NH2CONH2) were used as boron, carbon and nitrogen source in 1:1:2 M ratios. The concentration of MWCNT in BCNO phosphor was varied as 1, 3, 5, 7 wt%. XRD results show cubic B2O3, hexagonal carbon phase and h-BN structure in as-prepared phosphor nanocomposite. SEM images reveal controlled growth, uniform morphology and distribution in phosphor material with the increase in wt% concentration of MWCNT. Increase in wt% concentration of MWCNT increases crystallinity but reduces band gap in BCNO phosphor material. Better CIE color coordinates (x = 0.25, y = 0.25) are obtained for as-prepared nanocomposite which makes it an exceptional choice for chip -on board (COB) based WLEDs.