Radiative parameters of Eu3+ ions in CdSe nanocrystal containing silica matrices

Structural and optical characterization of CdSe nanocrystallites/rare earth ions in sol–gel glasses

“…Fluorescence enhancement for the rare earth ion Eu 3+ was reported in our earlier paper [9]. Fluorescence recorded directly from the spectrofluorophotometer using a digital web camera (1.3 Mega Pixels, Creative Live Pro) for each sample is shown in Fig.…”

“…The highest branching ratio corresponds to the experimentally observed strongest peak at 613 nm. The branching ratio values obtained from the experiment are tabulated along with those obtained from Judd-Ofelt calculations [9] in Table 1(a). The heat treated Tb 3+ doped sol-gel glass shows four bands which belong to the 5 D 4 !…”

Structural studies and luminescence properties of CeO2:Eu3+ nanophosphors synthesized by oxalate precursor method

“…The luminescent properties such as surface luminescence, emission lifetime, luminescence quantum efficiency and concentration quenching strongly depend on the particle size of the phosphor in the nanoregime (Sun and Murray 1999;Suryanarayana 1995;Kruis et al 1998;Hase et al 1990). Hence, in the field of practical phosphors, extensive research has been focused on the synthesis of nanophosphors with improved and consistent efficiency; consequently, the conventional phosphors were replaced by nanophosphors in many of the fields (He et al 2003;Jose et al 2005). Rare earth ion activated nanophosphors gained great attention due to their unique optical, magnetic and electronic properties arise from their 4f electronic configuration.…”

Y2O3:Eu3+ based nanophosphors with higher oscillator strength through lithium incorporation and indirect oxidation

“…The spontaneous emission probability determined by the values of˝4 and˝6 is affected by the covalency of rare earth ion sites. The branching ratio of the luminescent transitions originating from the 5 D 0 level (ˇR) having a value greater than 50% becomes promising materials for display devices and laser materials [25].…”