Rare-earth doped gadolinia based phosphors for potential multicolor and white light emitting deep UV LEDs

Abstract

Gadolinium oxide host and europium/dysprosium/terbium doped gadolinium oxide nanoparticles were synthesized using the sonochemical technique. Gadolinium oxide nanocrystals were also co-doped with total 2 mol% of Eu(3+)/Dy(3+),Eu(3+)/Tb(3+),Dy(3+)/Tb(3+), and also Eu(3+)/Dy(3+)/Tb(3+) ions, by the same method. The nanoparticles obtained were characterized using powder x-ray diffraction (XRD), transmission electron microscopy (TEM), and selected area electron diffraction (SAED) techniques. The size of the particles ranged from 15 to 30 nm. The triple doped samples showed multicolor emission on single wavelength excitation. The photoluminescence results were correlated with the lifetime data to get an insight into the luminescence and energy transfer processes taking place in the system. On excitation at 247 nm, the novel nanocrystalline Gd(2)O(3):RE (RE = Dy, Tb) phosphor resulted in having very impressive CIE chromaticity coordinates of x = 0.315 and y = 0.316, and a correlated color temperature of 6508 K, which is very close to standard daylight.

Novel Gd(OH)3, GdOOH and Gd2O3 Nanorods: Microwave-Assisted Hydrothermal Synthesis and Optical Properties

“…Our group has postulated that the PL intensity in inorganic oxides is also associated with the thermal treatment history, structural order-disorder, and electronic levels in the band gap 41,14 . Moreover, an earlier study has demonstrated the synthesis of rare-earth doped Gd 2 O 3 nanoparticles 42 . Multicolor emissions at selected wavelengths could be obtained by altering the doping concentration in the triple-doped sample.…”

Tunable white light emissive Mg2SiO4:Dy3+ nanophosphor: Its photoluminescence, Judd–Ofelt and photocatalytic studies

“…Recently, much attention was focused on nanomaterials doped with lanthanide ions (Ln 3+ ) in the field of material science for designing efficient phosphors, lasers, optical devices, solar cells, bio-imaging, photodynamic therapy and security markers [7][8][9][10][11][12][13]. The main reason for wide range of applications of lanthanide ion doped nanomaterials is undoubtedly the spectroscopic nature of f-f transitions that are responsible for the observed luminescence [14].…”

Glycine–Nitrate Process for the Elaboration of Eu3+‐Doped Gd2O3 Bimodal Nanoparticles for Biomedical Applications

“…Recent research has demonstrated that gadolinium oxide (Gd 2 O 3 ) nanoparticles can act as T 1 CAs to remarkably enhance MRI signal intensity owing to the increased availability of Gd 3+ ions at their surface to interact with water. [30][31][32][33][34] The synthesis of such nanosized particles can be performed by various methods such as the polyol, [35] sol lyophilization, [36] sol-gel, [37] precipitation, [38][39][40] hydro/ solvothermal, [41][42][43] sonochemistry, [44] spray pyrolysis, [45,46] and aqueous self-combustion methods. [46][47][48] Aqueous selfcombustion can be the most appropriate synthesis route as it can yield high-phase-purity powder with excellent chemical homogeneity.…”