Photoluminescence Study Of Eu3 Research Articles

Thermo and photoluminescence studies of Eu3+, Dy3+ co-doped Sr2SiO4 nanophosphor prepared by solution combustion method

Sr2SiO4: Eu0.01 phosphors co-doped with Dy3+ was prepared by solution combustion method at a low temperature of 500°C. The effect of co-dopant on the luminescent properties of Sr2SiO4: Eu was investigated in detail. The crystalline size and structural properties are studied by X-ray diffraction. The peaks of Sr2SiO4 are assigned by FTIR studies. Which shows that dopants have occupied the position of Sr2+ ions in the crystal. The morphology and size distribution of phosphors was examined by SEM. Image looks like thermocole particles in thermocole sheet. The photoluminescence (PL) intensity of Sr2SiO4: Eu co-doped with Dy3+ shows emission in all the three regions red, blue and green. Thermoluminescence (TL) of Sr2SiO4: Eu co-doped with Dy3+ was investigated using γ-irradiation for different mol% of Dy3+ in the dose range of 1–6 KGy at a warming rate of 5 °C/s.

Photoluminescence studies of Eu3+ doped bismuth silicate based phosphor for plant grow LEDs

Artificial red lights of good quality are essential for indoor plant growth as it has a wide spectrum effects on photosynthesis rate and photomorphogenic processes of organic plant growth cycle. In present work we report on Eu3+ doped Bi4Si3O12 (BSO) phosphor for spectroscopic implication in smart plant grow LEDs. Eu3+ activated series of Bi4Si3O12 phosphor have been prepared via traditional solid-state reaction method. Crystal structure and phase formation characterization is determined by using X-ray diffraction (XRD). Photoluminescence spectra of prepared phosphor shows broad excitation spectra ranging from 200 to 530 nm. The optimal Eu3+ doping concentration observed at 3 mol%. Emission spectra observed under the excitation of 270 nm shows broad emission band at 469 nm along with other characteristic peak at 500 nm-710 nm. Observed emission peaks at 622 nm, 656 nm and 702 nm were chosen opt for plant grow lights. The phytochrome PFR absorption spectra of plants matches well with the emission band of our Eu3+ doped BSO phosphor and can be considered as a viable choice for solid state lighting and plant grow light LEDs.

Wet chemical synthesis and photoluminescence study of Eu3+ activated orthophosphate-based phosphor for n-UV-based solid-state lighting

Wet chemical synthesis and photoluminescence study of Eu3+ activated orthophosphate-based phosphor for n-UV-based solid-state lighting

Structural and photoluminescence studies of Eu3+-and Yb3+-doped cadmium sulfide nanoparticles prepared by precipitation method

Cadmium sulfide (CdS) nanoparticles (NPs) with europium (Eu) and ytterbium (Yb) dopant concentrations in the range of 1% to 4% were efficiently obtained through a co-precipitation approach in the presence of air at room temperature. Structural, morphological and optical characteristics of CdS : Eu3 + and CdS : Yb3 + NPs were explored by x-ray diffraction, Fourier transform-Raman, ultraviolet-visible absorption spectroscopy, and photoluminescence studies. The realized CdS : Eu3 + NPs (3%) demonstrate the best luminescence with three emission peaks at 470 nm (2.63 eV), 590 nm (2.1 eV), and 616 nm (2.01 eV) that correlates to the excitonic emission of CdS NPs.

Photoluminescence study of Eu3+ doped zinc-tungsten-antimonite glasses for red LED applications

The rare earth ions doped glassy materials have become crucial capstone in solid state lighting due to their top-notch optical properties. In this work, Eu3+ doped zinc-tungsten-antimonite glasses with compositions of (60 - x)Sb2O3 − 15WO3 – 25ZnO – xEu2O3 (where x is 0.5, 1.0, 1.5, 2.0, 2.5 and 3.0) were prepared by melt quenching technique. The glasses were prepared with the variation of concentration of Eu3+ ions to achieve superior brightness. The emission intensity increases with the increasing concentration of Eu3+ ions. The prepared glasses exhibit strong hypersensitive red emission at 616 nm due to 5D0 → 7F2 transition under 465 nm excitation wavelength. Along with maximum bright red emission of 3 mol % Eu3+ doped glass also demonstrates high degree of excited state lifetime (556 μs). All these properties strongly validate the bright prospect of these luminescent glasses for utilizing in red LED applications.

Optical band gap and photoluminescence studies of Eu3+-doped zinc silicate derived from waste rice husks

In this study, investigation on photoluminescence and optical properties of europium doped zinc silicate (Zn2SiO4:Eu3+) glass ceramics derived from white rice husk ash as potential silica source have been done. Undoped and 3 wt. % of europium doped zinc silicate were prepared by solid state method and sintered at 600–1000 °C for 2 h. XRD analysis revealed the phase formation of amorphous, α or β-Zn2SiO4:Eu3+ phases of the glass and glass ceramic samples. FESEM results show the samples were irregular in shapes but well connected and formed large grain crystallites as sintering temperatures increases. The optical band gap values for undoped samples are increasing from 2.97 eV to 3.39 eV respectively. Meanwhile, the optical band gap values for 3 wt. % Eu3+ doped samples decrease from 4.14 eV to 2.62 eV and increase again to 3.71 eV as sintering temperature increases. PL analysis concludes that the red emission exhibited corresponding to 5D0 → 7F2 electron configuration at 612 nm while excitation spectra was found at 400 nm attributed to 7F0 → 5L6 transition. As conclusion, Eu3+ doped Zn2SiO4 glasses has potential as glass host phosphor which can be used for optical devices such as plasma display panels (PDPs) and cathode ray tubes.

Photoluminescence studies of Eu3+ activated SrTiO3 nanophosphor prepared by solution combustion approach

Orange-red emitting europium doped (1–9mol%) SrTiO3 (ST) nanophosphor was synthesized by solution combustion method using urea as a fuel. The crystallinity and phase formation of the nanophosphor was studied by powder X-ray diffraction (PXRD). The Field- emission scanning electron microscopy (FE-SEM) images are evident for the porous and agglomeration nature for the product. The Fourier transform infrared spectroscopy (FT-IR) indicates the formation of the oxide bonds. The photoluminescence (PL) of SrTiO3:Eu3+ phosphor with different mol% of Eu3+ excited by 395nm light was studied. The photoluminescence spectra exhibit characteristic luminescence from 5D0→7F1,2,3 intra-4f shell Eu3+ ion transitions. An intense orange red emission peak at 615nm was observed due to electric dipole (5D0→7F2) transition. The color purity of the phosphor was confirmed by CIE co-ordinates. The study demonstrates a simple and efficient method for the synthesis of novel nanophosphor with enhanced orange-red emission.

Enhanced photoluminescence behaviour of Eu3+ activated ZnMoO4 nanophosphors via Tb3+ co-doping for light emitting diode

In the present study, structural and photo-luminescence studies of Eu3+ and Tb3+ co-doped ZnMoO4 host matrix has been investigated in detail. ZnMoO4:Eu3+/Tb3+ have been synthesized via a simple and cost effective co-precipitation method. XRD, Raman and FTIR studies confirmed its triclinic structure of Eu3+/Tb3+ co-doped ZnMoO4 host. Emission spectra of the measured samples corroborate the dominant electric dipole transition emission (5D0-7F2) intensity over magnetic dipole transition emission (5D0-7F1) intensity. Moreover, the improvement in red emission (5D0-7F2) for Eu3+(3at%) and Tb3+(2at%) and high asymmetric ratio ∼10.4 is observed which dictates it as a highly red emitter. Additionally, commission international de-I′ Eclairage (CIE) values approaches to NSTC. Color purity of red emission improves after Tb3+ co-doping. Photoluminescence studies reveals that Tb3+ acts as a sensitizer for the Eu3+ activated ZnMoO4 host matrix. Study reveals that Eu3+/Tb3+ co-doped ZnMoO4 can be excited by near UV device, which is bottleneck in the advancement of LEDs technology.

Structural and photoluminescence studies of Eu3+ doped l-Tartaric single crystal through evaporation technique

Europium doped l-Tartaric acid; a non-linear optical single crystal was grown by slow evaporation solution growth method. The grown crystal was characterized by XRD for phase analysis, HRXRD for crystalline perfection, functional group by FTIR spectroscopy and powder SHG measurement for getting an estimate of NLO efficiency. The emission spectrum of Eu3+ doped l-Tartaric acid obtained after excitation at 394nm and corresponding excitation spectrum by monitoring at 615nm emissions. The decay curve is recorded corresponding to the 5D0 level of Eu3+ from tartaric acid doped with europium ions. The transparency of the crystal shows >90%, thermal analysis shows that the crystal to be thermally stable up to 189°C and estimated atomic elemental composition in grown crystal with EDAX. l-Tartaric acid with chiral structure acts as a good host material for probing Eu3+ ions in synthesis of luminescent materials.

Luminescence properties of Eu3+ -activated SrWO4 nanophosphors- Concentration and Annealing effect.

Eu3+ (2, 5, 7 and 10 at.%) activated SrWO4 phosphors were prepared via a polyol synthesis route at low temperature (∼150 °C) under urea hydrolysis. X-ray diffraction studies of all Eu3+ doped samples corroborate good crystallinity with a tetragonal scheelite-type structure of the SrWO4 phase. The value of strain was obtained in the range ∼0.003 to 0.004 for as-prepared (ASP) and samples annealed at 900 °C. Vibrational modes were studied using IR and Raman Spectroscopy. Photoluminescence studies of Eu3+ doped SrWO4 samples were carried out under 266, 394 and 464 nm excitations. An intense red emission was observed with a strong peak at ∼613 nm due to 5D0 → 7F2 transition under 266 nm. Effect of annealing at 900 °C on the photoluminescence properties of samples has been studied and it was found that luminescence intensity increases up to ∼9 times (for 10 at.% Eu3+-doped SrWO4) on annealing as compared to the corresponding as-prepared sample. High asymmetric ratios (A21) ∼ 6–13 were observed demonstrating it to be a red emitter. Calculated CIE co-ordinates of these Eu3+ doped samples under 266 nm excitation for ASP and annealed at 900 °C are x = 0.65 & y = 0.34, which are closer to the standard of NTSC (x = 0.67 & y = 0.33). These studies reveal that SrWO4:Eu3+ nano-phosphors can be used as potential red emitting phosphors for the development of white LEDs.

Structural and photoluminescence studies of Eu3+ doped zinc oxide nanorods prepared by precipitation method

Trivalent europium doped zinc oxide (ZnO:Eu3+) nanocrystals were synthesized via room temperature chemical co-precipitation and they were systematically characterized by means of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and photoluminescence (PL) spectroscopy. The as-synthesized samples were found to have hexagonal wurtzite coexisted with the intermediate Zn5(OH)8Cl2·H2O phase, while the single hexagonal phase was facilitated due to the calcinations. The as obtained samples were broadly composed of nanoflakes while the highly crystalline nanorods were formed due to low temperature annealing of the as-synthesized samples. The crystallite size of the nanoflakes and nanorods (40–90 nm) were extracted from the XRD pattern which was found to be consistent with scanning electron microscopy (SEM) measurements. The photoluminescence (PL) spectra of nanophosphors showed bright red and orange emissions at 618 and 594 nm respectively with efficient broad blue green emission spectrum due to ZnO lattice. Further, a good energy transfer process from ZnO host to Eu3+ was observed in PL emission and excitation spectra of Eu3+ doped ZnO ions. In all, the present nanophosphors were found to have great potentiality for bio-applications.