Charge compensation in RE³⁺ (RE = Eu, Gd) and M⁺ (M = Li, Na, K) co-doped alkaline earth nanofluorides obtained by microwave reaction with reactive ionic liquids leading to improved optical properties

Abstract

2014Charge compensation in RE3+ (RE = Eu, Gd) and M+ (M = Li, Na, K) co-doped alkaline earth nanofluorides obtained by microwave reaction with reactive ionic liquids leading to improved optical properties Journal of Materials Chemistry C,Cambridge : Royal Society of Chemistry -RSC,v. 2, n. 44, p. 9439-9450, 2014 http://www.producao.usp.br/handle/BDPI/50592 (REDOR) studies, reveal distinct local fluoride environments, the populations of which are discussed in relation to spatial distribution and clustering models. In the co-doped samples, fluoride species having both Na + and La 3+ ions within their coordination sphere can be identified and quantified. This interplay of mono-and trivalent ions in the CaF 2 lattice appears to be an efficient charge compensation mechanism that allows for improved performance characteristics of such co-doped phosphor materials.

Growth and characterization of neodymium and ytterbium doped barium chloride dihydrate single crystals

“…Rare earth doped barium halide single crystals are also used as scintillators for X-ray and gamma ray detections [11]. Lorbeer et al [12] reported the introduction of trivalent lanthanide ions into the divalent alkaline earth fluoride lattice and observed that the cubic crystal system doesn't changed. This substitution requires charge compensation and hence leads to the defects such as interstitial fluoride ions and or defect aggregation.…”

Tuning oxygen vacancy photoluminescence in monoclinic Y2WO6 by selectively occupying yttrium sites using lanthanum

“…An easy and convenient approach is to dope impurities in matrixes to enhance emission or obtain multi-color emission141516. The impurity can be any elements for the non-isovalent doping, such as trivalent rare earth and monovalent alkaline metal ions1718. This method has been extensively investigated in luminescent compounds, photo-catalysts, and magnetic materials.…”

Synthesis of metal-fluoride nanoparticles supported on thermally reduced graphite oxide

“…Decomposition of transition-metal amidinates in [BMIm][BF 4 ] yielded metal fluoride nanoparticles for Mn, Fe and Co [ 63 ]. The reaction of metal acetate (hydrate) precursors in ethylene glycol and an excess of [BMIm][BF 4 ] gave fluoride nanoparticles [ 67 ]. Mesoporous carbon/iron carbide hybrids were synthesized using mesoporous silica as template and the ionic liquid [BMIm][FeCl 4 ] as carbon and iron source [ 68 ].…”