Nanophosphor CaSO_4:Eu~(2+)For Photoluminescence Liquid Crystal Display (PLLCD)

摘要

In this work PL enhancement of CaSO_4:Eu~(2+) nanophosphor which was synthesized with 0.01M molarity by co-precipitation method is presented. Synthesized phosphor was characterized by XRD, SEM, TEM and PL measurements. Average particle size is found to be in the range 80-100nm with Hexagonal morphology and PL studies showed emission peaks at 380nm, when samples were excited by 254nm.The observed PL emission is characteristic emission of Eu~(2+) similar to that observed in bulk CaSO_4:Eu~2. However under identical condition it is observed that intensity of emission get enhanced for 0.01M size which is doubled to that of 0.1M with similar emission at 380nm. A phosphor with narrow emission band around 390 nm is desirable, since at this wavelength the transmission of standard glass, polarizing plastic, other coating and LCD material is at acceptable level. Strong Eu2+ emission is observed in CaS04:Eu nanophosphor which finds applications for PLLCD (photoluminescent liquid crystal display).