COMPOSITION FOR INFRARED ABSORPTION LAYER, INFRARED CUT FILTER, AND IMAGING DEVICE

摘要

This composition for an infrared absorption layer contains: a compound formed by copper ions and a phosphonic acid represented by formula (a); and at least one of a phosphoric acid diester represented by formula (b1) and a phosphoric acid monoester represented by formula (b2). In addition, particles containing at least the abovementioned compound are dispersed in the composition. The phosphonic acid content is less than 2.5 times the total amount of the phosphoric acid diester content and the phosphoric acid monoester content on a molar basis. R1 is an alkyl group having 2-4 carbon atoms, each of R21, R22, and R3 is a monovalent functional group represented by -(CH2CH2O)nR4, n is an integer of 1-25, and R4 is an alkyl group having 6-25 carbon atoms.