Luminescent materials consisting of Eu(III) ions complexed in heteropolyoxometalates incorporated into silica xerogels

Lanthanopolyoxometalates as Building Blocks for Multiwavelength Photoluminescent Organic–Inorganic Hybrid Materials

“…The maximum quantum yield value was measured for EuP 2 Mo 17 under intra‐4f 6 excitation (Table 4). The measured values for hybrid 4 (smaller than that of the precursor compound) are similar to those found for SiO 2 ‐poly(ethylene glycol) and SiO 2 ‐glycidoxypropyltrimethoxysilane systems with K 13 [Eu(SiMo x W 11– x O 39 ) 2 ] (0.031–0.034) 29. Although the quantum yield values of TbP 2 W 17 lie below the detection limits of our equipment (0.01), the presence of HpicOH moieties in hybrid 6 leads to an enhancement in the quantum yield values to 0.08 (320–350 nm excitation wavelength).…”

Lanthanide‐Containing Light‐Emitting Organic–Inorganic Hybrids: A Bet on the Future

“…[29] However, it hinders possible applications as phosphors, as the hybrid host, in some cases, plays the role of a protective cage, strongly decreasing the UV degradation rate. This feature has been demonstrated by different groups in the literature [30][31][32]80,149] (Fig. 9), and could be employed in new UV dosimeters sensitive to specific wavelengths selectively detected, since the absorption properties of the organic-inorganic hybrid host may be easily chemically tuned.…”

“…[128] The in situ formation of Eu 3þ complexes generally induces also an enhancement of the emission quantum efficiency, compared to those of the pure complexes. [126] Hybrids incorporating either Eu(CF 3 SO 3 ) 3 [149] and for Ce 3þ -based organicinorganic hybrids (0.11). [203] For ordered hybrids only two examples have been reported so far, namely Eu 3þ -based lamellar hybrids self-templated through an hydrogen bonding array, with values below 0.01, [135] and Y 2 O 3 :Eu 3þ nanocrystalline structures, 0.16.…”

Synthesis and sol–gel assembly of nanophosphors

“…Incorporation of [Eu(SiMo x W 11Àx O 39 ) 2 ] 13À (x = 1, 3 and 5) in silica xerogel matrices has been reported to synthesize light emitting materials [50]. The influence of POM composition (parameter x) and of silica matrix nature on the luminescence parameters (emission intensity, lifetime and quantum yield) has been studied for these composite materials.…”