Study of the effect of urea concentration on optical properties of Boron Carbon Oxynitride (BCNO) nanophosphor

Abstract Effect of urea concentration on optical properties of BCNO phosphor materials has been systematically investigated. Greenish-yellow luminescent BCNO phosphor materials were successfully synthesized by low-temperature, eco-friendly and non-toxic, green synthesis method. In this process, Boric acid (H3BO3 - 2 mol), Urea (NH2CONH2 - 0.25 mol to 2 mol) and Lemon Aqueous extract (LAE - 20v/v%) were used as precursors. PXRD ascertains the crystallinity of prepared BCNO phosphor materials which reduces with increasing concentration of urea. The SEM and AFM images show the flakes type structure of prepared BCNO phosphor materials. Quantum yield increased up to 61% for 0.5 mol% of urea and further decreased for higher concentration of urea. The Photoluminescence emission peak undergoes redshift on increasing the urea concentration up to 1.5 mol% and then saturates at higher concentration. PL emission in Greenish-Yellow region of as-prepared BCNO nanophosphor offers its potential application in WLED.