Observation of up conversion/ down conversion luminescence and structural analysis of La2Zr2O7: Pr3+ nano phosphors

Kumar, Amalesh; Manam, J.

doi:10.1016/j.mssp.2022.106828

Cited by 17 publications

(5 citation statements)

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“…The remaining maxima can An additional peak of the luminescence excitation band at 386 nm was observed for all SCMS glass samples. In [8], an additional peak with a maximum at 355 nm was also observed for the luminescence excitation spectra of La 2 Zr 2 O 7 :Pr 3+ nanophosphors, and the authors associated the appearance of this peak with the intrinsic defect absorption or the virtual charge transfer of Pr 3+ ions.…”

Section: Excitation and Down-converted Luminescence Spectramentioning

confidence: 87%

“…Visible-to-UV conversion of Pr 3+ ions occurs due to the absorption of blue or violet light (430-490 nm) through 3 H 4 → 3 P J transitions, followed by the UC of the excitation energy in one Pr 3+ ion through Excited State Absorption (ESA) or involving two Pr 3+ ions Energy Transfer Up-conversion (ETU) [2,7]. In addition, Pr 3+ ions as activators can produce greenish-blue or red emissions due to their excited energy levels 3 P 0 or 1 D 2 [8].…”

Section: Introductionmentioning

confidence: 99%

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UVC Up-Conversion and Vis-NIR Luminescence Examined in SrO-CaO-MgO-SiO2 Glasses Doped with Pr3+

Bezkrovna,

Lisiecki,

Macalik

et al. 2024

Materials

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The application of ultraviolet-C light in the field of surface treatment or photodynamic therapy is highly prospective. In this regard, the stable fluorescent silicate SrO-CaO-MgO-SiO2-Pr2O3 glasses able to effectively convert visible excitation on the ultraviolet praseodymium emission were fabricated and examined. An unusual wide-range visible-to-UVC up-conversion within 240–410 nm has been achieved in Pr3+-doped glasses, revealing their potential advantage in different sophisticated disinfection technologies. The integrated emission intensity was studied as a function of light excitation power to assess a mechanism attributed to UVC luminescence. Especially, it was revealed that the multicomponent silicate glass qualities and praseodymium 3PJ excited state peculiarities are favorable to obtaining useful broadband ultraviolet up-converted luminescence. The glass dispersion qualities were determined between 450–2300 nm. The impact of praseodymium concentration on Vis-NIR spectroscopic glass qualities was evaluated employing absorption spectra, emission spectra, and decay curves of luminescence associated with two involved praseodymium excited states. Especially, efficient interionic interactions can be inferred by investigating the decrease in 1D2 state experimental lifetime in the heavily doped samples. Examination of absorption spectra as a function of temperature implied that excitation at 445 nm should be quite effective up to T = 625 K. Contrary to this, temperature elevation gives rise to a moderate lowering of the visible praseodymium luminescence.

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Section: Excitation and Down-converted Luminescence Spectramentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

UVC Up-Conversion and Vis-NIR Luminescence Examined in SrO-CaO-MgO-SiO2 Glasses Doped with Pr3+

Bezkrovna,

Lisiecki,

Macalik

et al. 2024

Materials

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“…was evaluated using the formula [55] and is listed in Table 4. These values indicated that, under blue light excitation, the prepared LiSrVO 4 :x mol% Pr 3+ phosphors generate exceptionally pure red light.…”

Section: Colorimetric Propertiesmentioning

confidence: 99%

Emission enhancement in the luminescence performance of warm red light‐emitting LiSrVO₄:Pr³⁺ phosphors

Mala,

Albert,

Princy

et al. 2024

Luminescence

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Warm red‐emitting praseodymium‐doped LiSrVO4 phosphors were synthesized via solid‐state reaction. The phase formation was verified using an X‐ray diffraction study and the morphology was investigated using a scanning electron microscope study. The LiSrVO4:Pr3+ phosphors emitted red light when exposed to ultraviolet light, indicating their possibility for use in warm white light‐emitting diodes (WLEDs). Furthermore, the effect of charge compensators on the luminescence characteristics was addressed. The decay time was investigated using time‐resolved photoluminescence. Furthermore, thermal quenching was analyzed through temperature‐dependent photoluminescence spectra. Their sensitivity was calculated using temperature‐dependent decay time analysis. The colour purity of the emitted light could be measured by photometric analysis. This comprehensive investigation provides a thorough understanding of the luminescence properties of phosphors for WLED applications.

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“…In the 2010s, Xia et al [12,13] studied the electrical properties as a function of chemical composition for pyrozirconates: Gd 2 (Zr 1−x Nb x ) 2 O 7−x [12], and (Sm 1−x Dy x ) 2 Zr 2 O 7 [13]. Solid solutions involving RE-based zirconates were also studied for luminescent applications by Kumar and Manam [14,15], which investigated the up-and down-conversion emission processes for La-Pr [14] and Y-Er [15] composition series and correlating their optical properties with the synthesis process, as well as the structural and thermal features [16]. In the same direction, pyrosilicates and pyrotitanates were also produced and studied in detail regarding the already known polymorphism phenomena, mainly to understand the correlation between the structural and the photoluminescent properties [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Reddish-orange emitting Eu_2−xGd _x Ge₂O₇ pyrogermanate ceramic phosphors: synthesis and role of Eu³⁺/Gd³⁺ substitution on the optical features

Martins,

Caixeta,

de Souza

et al. 2023

J. Phys. D: Appl. Phys.

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In this work, highly luminescent pyrogermanates were successfully synthesized through the solid-state reaction route, and the role of gradual Eu3+ substitution for Gd3+ on the structure and photoluminescent properties of Eu2−x Gd x Ge2O7 pyrogermanates was investigated. Pure Eu2Ge2O7 ceramic is triclinic, belonging to the P1 (#1) space group, and by increasing the x values, the crystal structure changes with the partial substitution of Eu3+ ions by the Gd3+ ions into the chemical lattice. The other phase-pure ceramic, Gd2Ge2O7, belongs to the tetragonal P41212 (#92) space group. Complete solid solubility was attained for x ⩽ 1.6, where Gd3+ replaced Eu3+ in the triclinic structure. It was verified that the band gap energies are dependent on the crystalline structure, increasing as Gd replaced Eu in the Eu2−x Gd x Ge2O7. The lowest band gap value (5.13 eV) was observed for the triclinic Eu2Ge2O7, and the highest one (5.88 eV) for the tetragonal Gd2Ge2O7. Highly intense reddish-orange emission (quantum efficiency up to 91.9%), through excitation at charge transfer band and Ln3+ f–f transitions were evaluated as the Gd substitution rises. Substitution-sensitive phase change at the nanoscale was monitored by Eu3+ emission, validating the presence of Eu3+ in the triclinic and/or tetragonal phase depending on the chemical composition (or the Gd3+/Eu3+ ratio). The chromaticity diagram figured out a reddish-orange emission, making them promising materials for high-entropy and photonic devices as solid-state lighting using excitation by near UV light-emitting devices.

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Observation of up conversion/ down conversion luminescence and structural analysis of La2Zr2O7: Pr3+ nano phosphors

Cited by 17 publications

References 50 publications

UVC Up-Conversion and Vis-NIR Luminescence Examined in SrO-CaO-MgO-SiO2 Glasses Doped with Pr3+

UVC Up-Conversion and Vis-NIR Luminescence Examined in SrO-CaO-MgO-SiO2 Glasses Doped with Pr3+

Emission enhancement in the luminescence performance of warm red light‐emitting LiSrVO₄:Pr³⁺ phosphors

Reddish-orange emitting Eu_2−xGd _x Ge₂O₇ pyrogermanate ceramic phosphors: synthesis and role of Eu³⁺/Gd³⁺ substitution on the optical features

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Observation of up conversion/ down conversion luminescence and structural analysis of La2Zr2O7: Pr3+ nano phosphors

Cited by 17 publications

References 50 publications

UVC Up-Conversion and Vis-NIR Luminescence Examined in SrO-CaO-MgO-SiO2 Glasses Doped with Pr3+

UVC Up-Conversion and Vis-NIR Luminescence Examined in SrO-CaO-MgO-SiO2 Glasses Doped with Pr3+

Emission enhancement in the luminescence performance of warm red light‐emitting LiSrVO4:Pr3+ phosphors

Reddish-orange emitting Eu2−x Gd x Ge2O7 pyrogermanate ceramic phosphors: synthesis and role of Eu3+/Gd3+ substitution on the optical features

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Product

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Emission enhancement in the luminescence performance of warm red light‐emitting LiSrVO₄:Pr³⁺ phosphors

Reddish-orange emitting Eu_2−xGd _x Ge₂O₇ pyrogermanate ceramic phosphors: synthesis and role of Eu³⁺/Gd³⁺ substitution on the optical features