Reduction of concentration-induced luminescence quenching in Eu3+-doped nanoparticles embedded in silica

Synthesis and Optimum Luminescence of CaWO4-Based Red Phosphors with Codoping of Eu3+and Na+

“…Surprisingly, the quantum efficiency and lifetime of Ca 1−2 x (Eu 3+ ,Na + ) 2 x WO 4 nanocrystals showed the same variation trend with Eu content. Similar optimum concentration of rare earth luminescence ions has also been observed for Er 3+ doped Bi 2 O 3 −B 2 O 3 −SiO 2 glasses and Eu 3+ -doped ZrO 2 and Y 2 O 3 systems imbedded in silica . The highest quantum efficiency of CaWO 4 :Eu 3+ /Na + nanocrystals here is much higher than 68% of La 2 (WO 4 ) 3 :Eu 3+ prepared by a two step Pechini method and 59% of LaPO 4 :Eu 3+ nanowires fabricated by a hydrothermal treatment, but still lower than some commercial phosphors, such as Y 2 O 3 :Eu 3+ with quantum efficiency of nearly 100% .…”

Structural and photoluminescence properties of ZrO2:Eu3+ @ SiO2 nanophosphors as a function of annealing temperature

“…Although the cause for luminescence reduction above 800 1C remains undetermined, several authors have attributed this effect to the size of the particles [12,27,28]. They hypothesized that in nanocrystals the probability of the exciton coming into the vicinity of a quenching site is reduced.…”

“…Moreover, for Eu 3 + -doped materials, the literature supports a beneficial contribution given by the nanostructure towards 5 D 0 -7 F J emission properties. For such systems, the improved luminescence properties are mainly attributed to the influence of a confinement effect on resonant energy transfer in nanosized particles [3][4][5][6][7][8][9][10][11][12][13]. For applications involving DNA microarrays and bio-imaging, it is necessary to coat the lanthanide-doped nanoparticles with an inexpensive and non-toxic material.…”

Rheology Study of Silica−Zirconia Sols for Elaboration of Silica−Zirconia Nanostructured Optical Fibers by Inverse Dip Coating

“…4,5 The core of such a fiber is composed of zirconia nanocrystals dispersed in an amorphous silica matrix and seems to be an interesting choice for reaching unconventional emission wavelengths. [6][7][8] The sol-gel process, 9 which is based on conversion of a liquid sol into a solid gel phase by a series of hydrolysis and condensation reactions of the precursors, has been used to synthesize the nanostructured material that constitutes the core of the fiber. Indeed, this chemical process has been extensively developed during the past few years, especially for the synthesis of silica glass doped with rare earth ions or transition metals [10][11][12] as well as for the synthesis of materials which have original microstructural properties.…”

“…Optical fibers have been considerably developed and studied during this past decade, especially the microstructured optical fibers, the so-called photonic crystal fiber (PCF). − Recent advances in technology related to this field of applications have demonstrated the possibility of designing a new generation of optical fibers, which present a nanostructured core associated with good waveguiding properties. , The core of such a fiber is composed of zirconia nanocrystals dispersed in an amorphous silica matrix and seems to be an interesting choice for reaching unconventional emission wavelengths. − …”