Temperature-sensitive luminescent photopolymer activated by europium β-diketonate complexes

Photopolymer luminescent compositions containing chelate complexes of Eu3+ with 2-naphthoyltri-fluoroacetone and trioctylphosphine oxide as a luminescent dopant have been developed for the photopolymer-based 3-D printing techniques. Photocured samples of photopolymer compositions are transparent in the visible range and have bright red luminescence under the UV excitation. Photophysical studies have revealed that photocured samples possess high quantum yields of luminescence up to 0.59 and monoexponential luminescence decay with 640 mu s lifetime at 293 K. It was found that the luminescence of photocured samples is temperature-dependent; the luminescence lifetime of Eu3+ ions decreases threefold during the heating from 293 to 373 K. The combination of monoexponential luminescence decay and high quantum yield is very promising for printing of temperature sensors. (C) 2019 Society of Photo-Optical Instrumentation Engineers (SPIE)