Photodegradation and photostabilization of europium compounds in polyvinyl chloride

Antiphotobleaching: A Type of Structurally Rigid Chromophore Ready for Constructing Highly Luminescent and Highly Photostable Europium Complexes

“…From the standpoint of materials engineering, convenient synthesis, high emission quantum yield (>0.5), and excellent photostability (no degradation >20 h under UV/blue excitation) are quite essential for successful application of such materials. [ 22,23 ] To overcome this shortcoming, lanthanide complexes have been incorporated into polymers, [ 24,25 ] ionic liquids, [ 12 ] organic-inorganic hybrid systems, [ 13,19,[26][27][28][29][30][31] and so on, where the matrix plays the role of a protective cage for the complexes, strongly decreasing the UV degradation rate. In most conditions, lanthanide complexes (e.g., Eu 3+ and Tb 3+ chelates) harvest excitation energy from UV/blue light.…”

Luminescence and magnetic properties of europium(III) nitrate complex with 1,10-phenanthroline

“…This europium compound consists of the globules of the size about 100-300 nm. Its ESR spectrum can be assigned to Eu 2+ (the signal at g = 2.1) [1]. As shown by our data, in the case of the compound synthesized by the traditional method the Eu 2+ ESR signals are absent.…”

“…The ESR method revealed that at the mechanical friction in the material appeared the Eu 2+ paramagnetic sites [1]. They probably are located on the surface of nanoglobules.…”

“…It has been shown in [1] that the europium nitrate complex with 1,10-phenanthroline synthesized by the mechanochemical method is formed as globules of the 100-300 nm size collected into larger aggregates of globular shape or stacked in layers. The ESR method revealed that at the mechanical friction in the material appeared the Eu 2+ paramagnetic sites [1].…”

“…Earlier [1] we have studied dispersion, surface morphology, and ESR characteristics of the luminescent europium nitrate complex with 1,10-phenanthroline synthesized by the mechanochemistry technique. The data obtained were compared with the characteristics of a complex compound produced in the traditional way by precipitation in a water-ethanol medium.…”