Synthesis and Optical Spectroscopy of YPO4:Eu3+ Orange–Red Phosphors

Yahiaoui, Z.; Hassairi, M.; Dammak, M.

doi:10.1007/s11664-017-5401-4

“…Once again, the spectra can be divided into two regions, Region I between 0 and 300 cm −1 with the lattice vibrations [translation of PO43- (≈150 cm −1 ) and Ln 3+ (≈180 cm −1 ) and external rotational mode of the whole PO43- tetrahedral unit (≈295 cm −1 )] and Region II between 300 and 1,300 cm −1 with the ν 1 -ν 4 vibrational normal modes of the PO43- tetrahedra (Poloznikova and Fomichev, 1994; Yahiaoui et al, 2017). Following the assignment of xenotime Raman bands in Yahiaoui et al (2017), all four main region bands of the normal vibrational modes (ν 1 -ν 4 ) of LuPO 4 , Gd 0.3 Lu 0.7 PO 4 and Gd 0.5 Lu 0.5 PO 4 can be assigned (Figure 7, black vertical lines). In the Gd 0.7 Lu 0.3 PO 4 and TbPO 4 samples, some additional peaks over the entire spectral range (Figure 7, red vertical lines) are observed, which cannot be assigned to either a xenotime or a monazite phase with the help of literature.…”

Section: Resultsmentioning

confidence: 99%

A Spectroscopic Investigation of Eu3+ Incorporation in LnPO4 (Ln = Tb, Gd1-xLux, X = 0.3, 0.5, 0.7, 1) Ceramics

Lösch

¹

,

Hirsch

²

,

Holthausen

³

et al. 2019

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We have investigated the incorporation of the luminescent Eu 3+ cation in different Ln PO 4 ( Ln = Tb, Gd 1−x Lu x , x = 0.3, 0.5, 0.7, 1) host phases. All samples were analyzed with powder X-ray diffraction (PXRD), Raman spectroscopy, and site-selective time-resolved laser-induced luminescence spectroscopy (TRLFS) directly after synthesis and after an aging time of one year at ambient conditions. The PXRD investigations demonstrate the formation of a TbPO 4 phase in an uncommon anhydrite-like crystal structure evoked by a pressure-induced preparation step (grinding). In the Gd 1−x Lu x PO 4 solid solution series, several different crystal structures are observed depending on the composition. The TRLFS emission spectra of LuPO 4 , Gd 0.3 Lu 0.7 PO 4 , and Gd 0.5 Lu 0.5 PO 4 indicate Eu 3+ –incorporation within a xenotime-type crystal structure. TRLFS and PXRD investigations of the Gd 0.7 Lu 0.3 PO 4 composition show the presence of anhydrite, xenotime, and monazite phases, implying that xenotime no longer is the favored crystal structure due to the predominance of the substantially larger Gd 3+ –cation in this solid phase. Eu 3+ –incorporation occurs predominantly in the anhydrite-like structure with smaller contributions of Eu 3+ incorporated in monazite and xenotime. The electronic levels of the Eu 3+ –dopant in Gd 0.3 Lu 0.7 PO 4 and Gd 0.5 Lu 0.5 PO 4 xenotime hosts are strongly coupled to external lattice vibrations, giving rise to high-energy peaks in the obtained excitation spectra. The coupling becomes stronger after aging to such an extent that direct excitation of Eu 3+ in the xenotime structure is strongly suppressed. This phenomenon, however, is only visible for materials where Eu 3+ was predominantly incorporated within the xenotime structure. Single crystals of Eu 3+ –doped LuPO 4 show no changes upon aging despite the presence of vibronically coupled excitation peaks in the excitation spectra measured directly after synthesis. Based on this observation, we propose a lattice relaxation process occurring in the powder samples during aging, resulting in Eu 3+ migration within the crystal structure and Eu 3+ accumulation at grain b...

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“…Thus, high color purity of complexes confirms the successful applicability of virescent light emitting complexes in tricolor (red, green and blue) based white light emitting diodes (WLEDs. 42 In order to further explore the photoluminescence performance of complexes, decay curves of complexes (Fig. 6) are analyzed by fixing the respective excitation wavelength and emission wavelength (545 nm), which are well fitted into a single exponential decay law and determine the decay lifetime of excited resonating level 5 D 4 of the Tb(III) ion in milliseconds according to the single exponential equation: 43…”

Section: Optical Featuresmentioning

confidence: 99%

Enhanced Optoelectronic and Biological Potential of Virescent-Glowing Terbium(III) Complexes with Pyrazole Acid

Khanagwal

¹

,

Kumar

²

,

Bedi

³

et al. 2021

Journal of Elec Materi

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A series of five virescent color emitting terbium(III) complexes is fabricated by a cost-effective and eco-friendly solution precipitation technique with the utilization of 1-(4-methoxyphenyl)-5-(trifluoromethyl)-1H-pyrazole-4-carboxylic acid (L) as a primary ligand and highly conjugated nitrogen donor secondary ligands such as bathophenanthroline (batho), 5,6-dimethyl-1,10phenanthroline (dmph), 1,10-phenanthroline (phen) and 2,2-bipyridyl (bipy). The elemental compositions of complexes are examined through energy dispersive x-ray and elemental analyses, whilst the binding nature of ligand with terbium(III) ion is confirmed using proton nuclear magnetic resonance and infrared spectroscopy. The band gap energy (E g ) of complexes is found in the range of 3.85-3.34 eV as evaluated from diffuse reflectance spectral data. The significant thermal stability of these luminescent materials (157°C) demonstrates their key role as virescent component in white organic light emitting diodes. The intense emission and decay time of complexes are explored through photoluminescent study. The good color purity and Commission International De I'Eclairage color coordinates promise the enhanced performance of these materials in lighting appliances. The sensitization phenomenon highlights the role of ligands in increasing the luminescence intensity of complexes. The biological assessment indicates that the complexes are potent antimicrobial and antioxidant agents. The aforementioned features extend the field of applications of complexes in laser technology and optoelectronic devices.

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“…Although many of the previous reports used organic resin or silicone for nanocrystal encapsulation, they suffer from severe yellowing and decrease in transparency due to thermal/UV aging, leading to a detrimental chromatic shift and efficiency degradation in long‐term operation . Transparent glass‐ceramic is a typical hybrid material combining the merits of nanocrystals and glass.…”

Section: Introductionmentioning

confidence: 99%

“…Although many of the previous reports used organic resin or silicone for nanocrystal encapsulation, they suffer from severe yellowing and decrease in transparency due to thermal/ UV aging, leading to a detrimental chromatic shift and efficiency degradation in long-term operation. [35,36] Transparent glass-ceramic is a typical hybrid material combining the merits of nanocrystals and glass. Producing high-performance RGB emission in a monolithic material simultaneously requires a high-level control in the phase, composition, and morphology of the embedding nanocrystals.…”

mentioning

confidence: 99%

Emission Color Manipulation in Transparent Nanocrystals‐in‐Glass Composites Fabricated by Solution‐Combustion Process

Pan

¹

,

Ouyang

²

,

Wu

³

et al. 2020

Advanced Optical Materials

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Rational design and fabrication of multicolor fluorescent sources represent one of the significant challenges in the development of high‐performance solid‐state lighting, tunable coherent lasing, and full‐color display technologies. However, generation of simultaneous multicolor emission, especially white light generation with a wide color gamut is usually beyond the ability of a single material. Heterogeneous structures made by combinations of red, green, and blue emission building blocks are bulky, inefficient, complicated, and costly. Here reported is a bottom‐up strategy to generate simultaneous multicolor emission with continuous tunability in a single monolithic material based on the “nanocrystals‐in‐glass composite” (NGC) architecture. In this approach, a self‐sustained low‐temperature solution combustion process enables homogeneous solvent dispersion and eventually stable immobilization of multiple nanocrystals in transparent matrix. With transparency of up to 80%, further demonstrated is drawing of fiber from the melt of these combustion‐processed NGC materials. The optical spectra of the as‐drawn glass fiber can be precisely tuned and clustering is effectively suppressed. Moreover, the NGC materials exhibit remarkable anti‐thermal quenching behavior at temperatures of up to 200 °C. The bottom‐up strategy for NGC provides a versatile platform for the fabrication of high‐performance multifunctional fiber‐based devices for advanced applications in lasers, illumination, displaying, and biophotonics.

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Synthesis and Optical Spectroscopy of YPO4:Eu3+ Orange–Red Phosphors

Cited by 49 publications

References 67 publications

A Spectroscopic Investigation of Eu3+ Incorporation in LnPO4 (Ln = Tb, Gd1-xLux, X = 0.3, 0.5, 0.7, 1) Ceramics

A Spectroscopic Investigation of Eu3+ Incorporation in LnPO4 (Ln = Tb, Gd1-xLux, X = 0.3, 0.5, 0.7, 1) Ceramics

Enhanced Optoelectronic and Biological Potential of Virescent-Glowing Terbium(III) Complexes with Pyrazole Acid

Emission Color Manipulation in Transparent Nanocrystals‐in‐Glass Composites Fabricated by Solution‐Combustion Process

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