Surface modification model of long afterglow phosphors by saturated fatty acid based Al-Zr coupling agent

Abstract

Purpose

The purpose of this paper is to study the influence of different carbon chain lengths in coupling agents on the water resistance and compatibility of modified long afterglow phosphors and attempt to obtain their modification model and mechanism.

Design/methodology/approach

Three saturated-fatty-acid (caprylic, lauric, stearic acid)-based Al-Zr CAs (coupling agent) was synthesised and applied to modify the long afterglow phosphors SrMgAl₄O₈:Eu₂₊,Dy₃₊.

Findings

Results show that the coated amount on phosphors decreased from 13.41 to 6.53 per cent with the increased carbon chain length of fatty acid, and the better water resistant and suitability with organic resin can be obtained by lauric-based Al-Zr CA.

Originality/value

Considering that the decomposition process of modified phosphor was related with the decomposition performance of corresponding coupling agents and original phosphor, a method was first proposed to calculate the coated amount on phosphors by thermogravimetric analyser parameters.

Citation

Yin, P., Xue, C. and Guo, B. (2016), "Surface modification model of long afterglow phosphors by saturated fatty acid based Al-Zr coupling agent", Pigment & Resin Technology, Vol. 45 No. 5, pp. 330-334. https://doi.org/10.1108/PRT-07-2015-0060