UV TRANSFORMING MATERIALS BASED ON POLYLACTIDE DOPED WITH ANISOMETRIC EUROPIUM(III) COMPLEX
Rubrics: 1. CHEMISTRY
Authors:
1.
KNITU
3.
KNITU
5.
KNITU
6.
Kazan National Research Technological University
Russian Federation
Russian Federation
Type:
Article
Pages:
from 22
to 28
Status:
In work
Language:
Russian
Keywords:
EUROPIUM(III) COMPLEX, PLA, COMPOSITES, LUMINESCENCE
Abstract (English):
Luminescent materials are widely used in various fields of science and technology. Currently, of current interest are phosphors for fluorescent lighting, luminescent glasses and glass ceramics for lasers, optical fibers and solar concentrators, electroluminescent films for OLED, electron beam phosphors, materials based on lanthanide ions as probes of the structure of biological macromolecules. In this aspect, lanthanide(III) compounds attract the attention of researchers due to their unique luminescent properties, such as monochromatic emission, long luminescence lifetime, and large Stokes shift. However, one of the disadvantages of many known lanthanide(III) complexes is low photostability and, as a consequence, photodegradation under prolonged ultraviolet irradiation. This prevents their wide practical application in the production of high-tech devices and equipment. In this context, promising materials for obtaining light-converting materials are anisometric coordination compounds of lanthanides(III) resistant to UV photolysis. However, the focus of research is currently shifting from obtaining coordination derivatives of lanthanides(III) to the area of introducing these compounds into various matrices. At the same time, the introduction of lanthanide(III) complexes into matrices often contributes not only to an increase in their stability, but also to their mechanical strength. One of the promising matrices for coordination compounds of rare earth ions is polylactide (PLA). Polylactide is a non-toxic, biodegradable, biocompatible, transparent thermoplastic polymer used in 3D printing. In connection with the above, the possibility of creating composite materials based on a biodegradable thermoplastic polymer - polylactide and an anisometric europium(III) complex was studied. Due to the anisometric structure, the europium(III) compound is uniformly distributed in PLA in a fairly wide range of concentrations. When the content of the europium(III) complex increases to 20% by weight, the intensity of its luminescence does not reach the maximum level. On the other hand, in most similar systems known from the literature, quenching of the luminescence intensity usually occurs at comparatively lower concentrations (5-10%). In this regard, it has been established that the uniqueness of the structure of anisometric lanthanide(III) compounds allows the creation of composite materials based on them with a significantly lower influence of luminescence self-quenching processes than in analogs.
Luminescent materials are widely used in various fields of science and technology. Currently, of current interest are phosphors for fluorescent lighting, luminescent glasses and glass ceramics for lasers, optical fibers and solar concentrators, electroluminescent films for OLED, electron beam phosphors, materials based on lanthanide ions as probes of the structure of biological macromolecules. In this aspect, lanthanide(III) compounds attract the attention of researchers due to their unique luminescent properties, such as monochromatic emission, long luminescence lifetime, and large Stokes shift. However, one of the disadvantages of many known lanthanide(III) complexes is low photostability and, as a consequence, photodegradation under prolonged ultraviolet irradiation. This prevents their wide practical application in the production of high-tech devices and equipment. In this context, promising materials for obtaining light-converting materials are anisometric coordination compounds of lanthanides(III) resistant to UV photolysis. However, the focus of research is currently shifting from obtaining coordination derivatives of lanthanides(III) to the area of introducing these compounds into various matrices. At the same time, the introduction of lanthanide(III) complexes into matrices often contributes not only to an increase in their stability, but also to their mechanical strength. One of the promising matrices for coordination compounds of rare earth ions is polylactide (PLA). Polylactide is a non-toxic, biodegradable, biocompatible, transparent thermoplastic polymer used in 3D printing. In connection with the above, the possibility of creating composite materials based on a biodegradable thermoplastic polymer - polylactide and an anisometric europium(III) complex was studied. Due to the anisometric structure, the europium(III) compound is uniformly distributed in PLA in a fairly wide range of concentrations. When the content of the europium(III) complex increases to 20% by weight, the intensity of its luminescence does not reach the maximum level. On the other hand, in most similar systems known from the literature, quenching of the luminescence intensity usually occurs at comparatively lower concentrations (5-10%). In this regard, it has been established that the uniqueness of the structure of anisometric lanthanide(III) compounds allows the creation of composite materials based on them with a significantly lower influence of luminescence self-quenching processes than in analogs.
Keywords:
EUROPIUM(III) COMPLEX, PLA, COMPOSITES, LUMINESCENCE
EUROPIUM(III) COMPLEX, PLA, COMPOSITES, LUMINESCENCE
