Optical properties of Eu(fod)3-doped polymers using supercritical carbon dioxide

Photoluminescence of fluoroacrylate polymers impregnated with Eu(bta)3 using supercritical CO2

“…The fabrication of various planar optical devices (including sensors and opto-electronic elements) based on modern polymers has recently become a priority [1]. An effective approach to controlled modification of polymer optical properties is supercritical fluid (SCF) impregnation by molecular compounds [2] including rareearth element (REE) β-diketonates [3,4]. The important physical properties of this type of compounds relate to the sensitization of REE photoluminescence (PL) in the visible wavelength range through transfer of excitation energy from the ligand π * -level into the corresponding closely lying trivalent REE 4f-levels (antenna effect) [1].…”

“…REE typically have high coordination numbers [10]. Therefore, they can compensate for their coordinative unsaturation in β-diketonates, for example, by adding H 2 O molecules [3]. We studied the effect of the hydrophobic phen ligand on the luminescent characteristics of starting Eu(bta) 3 (H 2 O) 2 because it readily replaces H 2 O molecules in the coordination sphere of the cations and prevents H 2 O molecules from re-entering the complex from the environment.…”

“…Eu(bta) 3 (H 2 O) 2 and Eu(bta) 3 phen were synthesized using Eu(Cl) 3 , phen, and bta (Aldrich Chemical Company, USA). Polycrystalline powders (PCPs) were placed into 1-mm glass capillaries during the spectral studies.…”

“…FAP composed of 75% bifunctional {[CH 2 =CH-COOCH 2 ] 2 (CF 2 ) 4 } and 25% monofunctional [CH 2 =CH-COOCH(CF 2 ) 8 H] units contained Irgakur 651 photoinitiator (0.6%, 2,2-dimethoxy-1,2-diphenylethan-1-one). Eu(bta) 3 (H 2 O) 2 and Eu(bta) 3 phen were added to the FAP films using SCF technology. PCPs and films were placed simultaneously into the SCF reactor.…”

“…Absorption spectra were recorded in the range 200-400 nm using a DDS-30 deuterium lamp. The PL excitation channel consisted of an LD(D)-400 deuterium lamp combined with an MDR-12 monochromator (spectral slit width 13.6 nm, λ em = 300 nm) or an NSHU590 UV light diode (Nichia Corp., Japan) with emission wavelength maximum 380 nm and half-width 0.1 eV (12 nm) 2 and Eu(bta) 3 phen in EtOH (2,3) and in FAP (4,5), and Eu(bta) 3 phen and phen in EtOH (6, 7); difference of spectra 5 and 1 (8); solution concentration 5⋅10 16 cm -3 .…”