Electrospinning Preparation and Photoluminescence Properties of Y3Al5O12:Eu3+ Nanobelts

RE-Based Inorganic-Crystal Nanofibers Produced by Electrospinning for Photonic Applications

“…In fact, Eu 3+ ions, also possess a series of visible emission lines that originate from the 5 D 0 and 5 D 1 multiplets with good color-tuning properties [30,72,82], that make them very interesting for lightening applications. In fact, Eu-doped nanofiber mats have already been tested in realistic LED devices [32,34] and Eu 3+ is probably the mostly studied rare earth ion in nanofiber matrixes [1,13,19,29,30,32,34,35,37,41,42,45,47,48,51,[53][54][55]61,62,67,68,76,[79][80][81][82]84,[86][87][88][89]91,101,112] including some nanobelt structures [72] and hollow structures [82]. In most of these cases, diameter of the nanofibers was less than 300 nm, with a few exceptions [35,42,76].…”

“…Luminescence is usually studied after UV excitation of the 5d Eu 3+ absorption band that lies in between 250 and 350 nm in most compounds, but 394 nm in YF 3 [29,112] and 395 in YAG [79]. Emission of Eu 3+ ions is composed of several host-dependent peaks with wavelengths in the 500-720 nm region which locate its emission in the yellow-red region [30,34,47,48,51,72,82]. In some fluoride matrixes at high Eu 3+ doping level, Eu 3+ fluorescence shows some emission lines in the blue region, as well.…”

“…For example in YVO 4 the lifetime of 5 D 1 is reported to be around 7.5 µs [89], in NaGdF 4 lifetimes of 5 D 3 , 5 D 2 , 5 D 1 are 2.38, 4.04, 6.36 ms, respectively and in GdF 3 lifetimes of 5 D 3 , 5 D 2 , 5 D 1 are 2.26, 3.58, 3.88 ms, respectively. Concentration optimization of the luminescence intensity yelds an optimum concentration of Eu 3+ ions usually in the range of 5-8% [47,53,54,72,89] before the onset of concentration quenching effects, but in some compounds such as Y 2 O 3 , Y 2 O 2 S and Lu 2 O 2 S lower values (around 3%) have been reported [55,82] and in Gd 2 O 3 no concentration quenching effects have been observed up to 10% Eu 3+ concentration. Moreover, in some cases polarized emission have been observed and characterized [76,81] and in Ca (Sr)Al 2 Si 2 O 8 persistent luminescence from Eu 3+ ions has been observed with a lifetime of 157.12 s. Some of these compounds possess bifunctional properties.…”

Optical and structural properties of composites films based on Ce3+‐doped yttrium aluminium garnet nanoparticles embedded in polystyrene

“…[4] YAG has received considerable attention when doped with rare earth ions due to their interesting properties and applications such the manufacture of cathode ray tubes, field emission screens, scintillators, and electroluminescent screens. [5,6] However, the most important application is its ability to convert blue LED radiation into very broad band yellow emission. Indeed, the combination of the two rays (that of the blue diode and that of the phosphor) produces white light (LED).…”