Luminescent properties of nanoparticles LaSrAl3O7:RE3+ (RE = Eu, Tb) via the citrate sol–gel method

Bao, Agula; Chen, Tao; Yang, Hua

doi:10.1007/s10854-007-9366-6

Cited by 16 publications

(9 citation statements)

References 26 publications

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“…According to provided [16][17][18][19][25][26][27], we may point out that Ln 2 O 3 -SrO-Al 2 O 3 systems (Ln = Nd, Gd) are Table 2 Electron probe microanalysis data for the regions indicated in Fig. 2a, a 0 , On the basis of given above data, DySr 3 Al 2 O 7.5 appearance in the reaction mixture may be described by the fact that under mentioned conditions of DySrAlO 4 synthesis, the most stable phase is DySr 3 Al 2 O 7.5 .…”

Section: Discussionmentioning

confidence: 99%

“…-ray diffraction patterns of initial mixtures corresponding stoichiometry of DySrAlO 4 after sintering in air at 1300-1500°C for 5 h as well as theoretical diffractogram distinguished by the formation of Ln 2 SrAl 2 O 7 , LnSrAlO 4 , LnSr 2 AlO 5 , LnSrAl 3 O 7 and the absence of LnSr 3 Al 2 O 7.5 phases.According to[26], LnSr 2 AlO 5 crystallized in the tetragonal system is synthesized by calcination with intermediate grindings of stoichiometric amounts of SrCO 3 , Ln 2 O 3 and Al 2 O 3 mixture at 1400°C. To perform synthesis of LnSrAl 3 O 7 phases from simple oxides using solidphase technique, it is required to achieve higher temperatures of 1650-1700°C[27]. DySrAl 3 O 7 is received from stoichiometric amounts of SrCO 3 , Dy 2 O 3 and Al 2 O 3 , thermally treated at 1500°C for 48 h. The former is described in[28], as crystallizing inthe tetragonal system with the parameters of elementary unit cell: a = 0.776 nm, c = 0.509 nm, d calc = 4.84 g/cm 3 .…”

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confidence: 99%

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New DySrAlO4 Compound Synthesis and Formation Process Correlations for LnSrAlO4 (Ln = Nd, Gd, Dy) Series

Тугова

2016

Acta Metall. Sin. (Engl. Lett.)

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For the first time, DySrAlO 4 of K 2 NiF 4-type structure was synthesized. The parameters of DySrAlO 4 elementary unit cell are determined as follows: a = 0.368 (4) nm, c = 1.229 (2) nm, V = 0.166 (4) nm 3. The research of the complex aluminates LnSrAlO 4 (Ln = Nd, Gd, Dy) solid-state process demonstrated the change of the formation mechanism among LnSrAlO 4 (Ln = Nd, Gd, Dy) series from DySrAlO 4 oxide. The performed analysis provided a possibility to realize why chemists couldn't get DySrAlO 4 for a long period of time.

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

New DySrAlO4 Compound Synthesis and Formation Process Correlations for LnSrAlO4 (Ln = Nd, Gd, Dy) Series

Тугова

2016

Acta Metall. Sin. (Engl. Lett.)

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“…RE 3+ -activated inorganic phosphors are stable and can present strong emission properties owing to the well-known 4f intra-configurational electronic transitions under the UV or near-UV (NUV) irradiation, especially Eu 3+ and Tb 3+ [6,8,11,[22][23][24][25][26]. Since the electrons are well shielded from neighboring ions so sharp and discrete energy levels can be obtained in RE 3+ [27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Sol-gel auto-combustion synthesis and luminescence properties of GdCaAl3O7: RE3+ (RE=Eu, Tb, Eu@Tb) phosphors for near-ultraviolet light-triggered indoor illumination

Zhou

Jiang

Chen

et al. 2022

Journal of Luminescence

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The color-tunable GdCaAl3O7: RE 3+ (RE=Eu, Tb, Eu@Tb) phosphors were synthesized via an ultrafast sol-gel auto-combustion synthesis method. The XRD (X-ray diffraction) patterns confirmed the forming of GdCaAl3O7 tetragonal phase, and the SEM (Scanning electron microscopy) images indicated that the obtained products presented honeycomb-like structure due to the gas releasing during the auto-combustion process. The EDS (Energy dispersion spectra) results suggest that Eu 3+ and Tb 3+ were well incorporated into the host matrices of GdCaAl3O7. The luminescent properties, concentration quenching mechanism, energy transfer mechanism, luminescent dynamics, thermal stability and product practicability of GdCaAl3O7: R 3+ (RE=Eu, Tb, Eu@Tb) phosphors were investigated systematically. All the GdCaAl3O7: RE 3+ (RE=Eu, Tb, Eu@Tb) products presented the characteristic emission of doped RE 3+ . Using GdCaAl3O7: 50% Tb 3+ @3.0% Eu 3+ as yellow-emitting phosphors in combination with commercial BAM: Eu 2+ blue-emitting phosphors and a NUV chip can successfully package a warm white LED device with high color rendering index (CRI, 86.3) and low correlated color temperature (CCT, 3348 K) that was very suitable for near-ultraviolet light-triggered indoor illumination.

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“…Strontium lanthanum aluminate, SrLaAl 3 O 7 (SLA) is a complex compound that crystallizes in the tetragonal melilite-like structure with a space group P42 1 m with a general chemical formula ABC 3 O 7 (where A = Ca, Sr, Ba; B = La, Gd, Y and C = Al, Ga) 19,20 . The crystal structure of SLA is composed of five membered rings of AlO 4 tetrahedra linked at each corner, with the Sr 2+ and La 3+ ions situated at the centres of these tetrahedra 20 .…”

Section: Introductionmentioning

confidence: 99%

“…The crystal structure of SLA is composed of five membered rings of AlO 4 tetrahedra linked at each corner, with the Sr 2+ and La 3+ ions situated at the centres of these tetrahedra 20 . It is reported to have good mechanoluminescence properties and can be prepared with RE 3+ ions as dopants in several methods 20–24 .…”

Section: Introductionmentioning

confidence: 99%

Highly efficient upconversion of Er3+ in Yb3+ codoped non-cytotoxic strontium lanthanum aluminate phosphor for low temperature sensors

Pavani

Kumar

Srikanth

et al. 2017

Sci Rep

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Er3+ and Er3+/Yb3+ melilite-based SrLaAl3O7 (SLA) phosphors were synthesized by a facile Pechine method. The differences in emission intensities of 4I13/2 → 4I15/2 transition in NIR region when excited with Ar+ and 980 nm lasers were explained in terms of energy transfer mechanisms. Temperature and power dependence of upconversion bands in the visible region centered at 528, 548 and 660 nm pertaining to 2H11/2, 4S3/2 and 4F9/2 → 4I15/2 transitions were investigated. Fluorescence intensity ratio (FIR) technique was used to explore temperature sensing behaviour of the thermally coupled levels 2H11/2/4S3/2 of Er3+ ions in the phosphors within the temperature range 14–300 K and the results were extrapolated up to 600 K. Anomalous intensity trend observed in Er3+ doped SLA phosphor was discussed using energy level structure. Cytotoxicity of phosphors has been evaluated using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay in Bluegill sunfish cells (BF-2). The non-cytotoxic nature and high sensitivity of the present phosphors pay a way for their use in vitro studies and provide potential interest as a thermo graphic phosphor at the contact of biological products.

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Luminescent properties of nanoparticles LaSrAl3O7:RE3+ (RE = Eu, Tb) via the citrate sol–gel method

Cited by 16 publications

References 26 publications

New DySrAlO4 Compound Synthesis and Formation Process Correlations for LnSrAlO4 (Ln = Nd, Gd, Dy) Series

New DySrAlO4 Compound Synthesis and Formation Process Correlations for LnSrAlO4 (Ln = Nd, Gd, Dy) Series

Sol-gel auto-combustion synthesis and luminescence properties of GdCaAl3O7: RE3+ (RE=Eu, Tb, Eu@Tb) phosphors for near-ultraviolet light-triggered indoor illumination

Highly efficient upconversion of Er3+ in Yb3+ codoped non-cytotoxic strontium lanthanum aluminate phosphor for low temperature sensors

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