A warm white light macromolecular complex phosphor containing Eu(III),Tb(III) and Zn(II) with low color temperature and high color index

Abstract

This paper presented an approach warm white light macromolecular complex phosphor with low color temperature and high color index were synthesized with the copolymer as macromolecular ligand of 4-vinyl benzoate and methyl methacrylate and with Eu(III), Tb(III) and Zn(II) vacancy complexes. The structure and luminescent properties were characterized through infrared spectroscopy, ultraviolet–visible spectroscopy, thermogravimetry and fluorescence spectroscopy. The results show that polymethyl methacrylate functionalized by the carboxylic acid has the ability of coordination with metal ions. Under the excitation of near-ultraviolet light at 365 nm, the macromolecular complexes exhibit characteristic emission of Zn(II), Tb(III), and Eu(III) at 449 nm, 543 nm, and 613 nm, respectively. The CIE color coordinates (0.39, 0.35) calculated from the fluorescence emission spectra are located in the warm white region. The device was fabricated with a 365 nm near UV chip with a color temperature of 4237 K and a color rendering index of 83.