Photo-degradation Analysis of Luminescent Polymers with Lanthanide Complexes

Abstract

UV durability of luminescent Eu(III) complexes for future solar cell application is estimated using Fourier transform infrared spectroscopy (FT-IR). Sandwich-typed glass cells containing Eu(III) complexes powders under UV irradiation are used for the carbonyl index analysis (calculation of decomposition percentage of organic ligands) using FT-IR measurements. The durability of Eu(hfa) 3 (TPPO) 2 (hfa: hexafluoroacetylacetonate, TPPO: triphenylphospine oxide) is five times larger than that of Eu(tta) 3 (phen) (tta: trifluoromethylthienylacetylacetonate, phen: phenanthroline). Photophysical performance of Eu(III) complexes under UV irradiation is also evaluated using emission lifetimes and external quantum efficiency measurements of the solar cell module using EVA films with Eu(III) complexes. Photo-degradation analysis of luminescent polymer thin films with Eu(III) complexes are demonstrated for the first time.

Effective photosensitized, electrosensitized, and mechanosensitized luminescence of lanthanide complexes

“…Effective wavelength converters using lanthanide complexes for silicon solar cells have also been reported ( Fig. 2d) 9,10 .…”

Evolution of the external quantum efficiency of Si-based PV minimodules with encapsulated down-shifters and aged under UV radiation

“…As a result of the deactivation, the triplet oxygen transits to highly reactive singlet oxygen [39]. And for the case of the compounds that concern us, the thienyl groups in the tta ligand are sensitive to the singlet dioxygen and they may suffer irreversible oxidation which results in progressive destruction of the active species and therefore in a continuous decrease of the emission intensity [40]. Polymeric films with low oxygen permeability, such as PMMA, have a limited protective effect [41,42], but the encapsulation and the additional protection provided by the glass and the EVA improves the emission intensity, increases the durability of the complex and maintains its performance for a longer time.…”

Excitation Wavelength Engineering through Organic Linker Choice in Luminescent Atomic/Molecular Layer Deposited Lanthanide–Organic Thin Films

“…A possible route to enhance the luminescence efficiency is to combine the Ln 3+ ions with organic π-conjugated aromatic ligands, capable of absorbing UV light and transferring the absorbed energy to the Ln 3+ ions via a so-called antenna effect . Hence, lanthanide–organic complexes have attracted considerable attention as viable luminescence materials, and in particular, Tb 3+ , Eu 3+ , and Sm 3+ complexes have been investigated for their characteristic monochromatic green, red, and deep red emissions, respectively, for displays, lighting, and sensing devices. − Similarly, the near-IR emissions of Nd 3+ , Er 3+ , and Yb 3+ complexes with long emission lifetimes could be utilized in bioimaging applications; also, efficient wavelength converters using lanthanide complexes for silicon solar cells have been reported . The nature of the organic ligand also plays a role, and for example, nitrogen-containing molecules have been highlighted …”

“…6−10 Similarly, the near-IR emissions of Nd 3+ , Er 3+ , and Yb 3+ complexes with long emission lifetimes could be utilized in bioimaging applications; 11 also, efficient wavelength converters using lanthanide complexes for silicon solar cells have been reported. 12 The nature of the organic ligand also plays a role, 13 and for example, nitrogen-containing molecules have been highlighted. 14 Modern applications of luminescence materials based on increasingly complex/nanoscale device structures call for new material design and fabrication approaches, especially to produce these materials as high-quality thin films or conformal coatings.…”

“… 6 − 10 Similarly, the near-IR emissions of Nd 3+ , Er 3+ , and Yb 3+ complexes with long emission lifetimes could be utilized in bioimaging applications; 11 also, efficient wavelength converters using lanthanide complexes for silicon solar cells have been reported. 12 The nature of the organic ligand also plays a role, 13 and for example, nitrogen-containing molecules have been highlighted. 14 …”