Observation of exceptional strong emission transitions 5Dj (j=1−3) to 7Fj (j=1−3): Multicolor from single Eu3+ ion doped La2O3 nanoparticles

Loitongbam, Romeo Singh; Singh, N. Shanta; Singh, W. Rameshwor; Ningthoujam, R. S.

doi:10.1016/j.jlumin.2012.09.026

Cited by 26 publications

(6 citation statements)

References 34 publications

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“…The single broad peak at 3700–3000 cm –1 is attributed to the stretching vibrations of OH/H 2 O present in particles. The double peaks at around 1510 and 1420 cm –1 resulted from the C–O asymmetric and symmetric stretching vibrations of −COO – , which was absorbed over the surface of particles . This remains as a residue due to decomposition of the organic citrate precursor, which was used as the capping agent.…”

Section: Results and Discussionmentioning

confidence: 99%

Codoping of Yttria (Y₂O₃): Ho–Yb Nanoparticles with Li Increase Emitted Green Light Intensity for Security Ink and Bioimaging

Srivastava,

Sahu,

Singh

et al. 2023

ACS Appl. Nano Mater.

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Rare earth-doped up-conversion materials have attracted considerable attention because of their various applications in solid-state lasers, color displays, bioimaging, and so forth. The emission of most up-conversion materials does not have enough intensity. However, this intensity can be increased by doping of sensitizers. Ho 3+ -doped compounds show green emission which have various applications. Here, we have reported how the intensity of green emission can be increased by doping of sensitizers Yb 3+ and Li + . In this work, we have chosen Y 2 O 3 as the host, Ho 3+ as the activator, and Yb 3+ as the sensitizer and have studied their up-conversion properties under 980 nm laser. The metal citrate-gel decomposition method provides a homogeneous solid solution formation. Green light intensity increases significantly by the increase in the Yb 3+ concentration as well as codoping of Li + . The green light intensity of Ho 3+ for Y 2 O 3 :10 at % Yb 3+ − 2 at % Ho 3+ −5 at % Li + system is 9 times more than that of the Y 2 O 3 :10 at % Yb 3+ −2 at % Ho 3+ system. Also, we have carried out down-conversion phenomena of Ho 3+ by excitation at 448 nm. Luminescence intensity of Ho 3+ in the visible range decreases with doping of Yb 3+ or Li + due to energy transfer from Ho 3+ to Yb 3+ . Interestingly, luminescence peaks corresponding to Yb 3+ (1000 nm) and Ho 3+ (1200 nm) in the NIR range are also observed under 448 nm excitation. Peak observed at 1000 nm is related to the quantum cutting phenomenon. The quantum efficiency is found to be 180% from calculations. Its applications are extensively shown in different areas such as security ink, consignment identification, and bioimaging of muscle and bone through the NIR light up-conversion process.

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Section: Results and Discussionmentioning

confidence: 99%

Codoping of Yttria (Y₂O₃): Ho–Yb Nanoparticles with Li Increase Emitted Green Light Intensity for Security Ink and Bioimaging

Srivastava,

Sahu,

Singh

et al. 2023

ACS Appl. Nano Mater.

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“…5 D 0 , via a nonradiative transition, and then transit to the lower energy levels of valence band. Due to these transitions to the lower energy level, peaks are seen in the emission spectra at 578 nm ( 5 D 0 → 7 F 0 ), 590 nm ( 5 D 0 → 7 F 1 ), 609 nm, 625 nm ( 5 D 0 → 7 F 2 ), 655 nm ( 5 D 0 → 7 F 3 ), and 708 nm ( 5 D 0 → 7 F 4 ) (Geng et al, 2012; Loitongbam et al, 2013).…”

Section: Resultsmentioning

confidence: 99%

“…5 D 0 → 7 F 1 (590 nm), and peak 3, i.e. 5 D 0 → 7 F 2 (609 and 625 nm), are the most intense emission peaks and correspondence to the magnetic dipole (MD) transition ( 5 D 0 → 7 F 1 ) and the electric dipole (ED) transition ( 5 D 0 → 7 F 2 ), respectively (Loitongbam et al, 2013). The intensity of the MD transition is not reliant on the crystal field symmetry of the host lattice, while the intensity of the ED transition is highly dependent on the crystal field symmetry.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Photoluminescence Properties of Low-Dimensional Eu³⁺-Activated Y₄Al₂O₉ Phosphor Compared to Bulk for Solid-State Lighting Applications and Latent Fingerprint Detection-Based Forensic Applications

et al. 2019

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In recent years, nanoscale phosphors have become vital in optoelectronic applications and to understand the improved performance of nanophosphors over bulk material, detailed investigation is essential. Herein, trivalent europium-activated Y4Al2O9 phosphors were developed by solid-state reaction and solvothermal reaction methods and their performance as a function of their dimension was studied for various applications. Under 394 nm optical excitation, the photoluminescence (PL) emission, excited state lifetime of the nanophosphor, exhibits greater performance than its bulk counterpart. The homogeneous spherical structure of the nanophosphors as compared with solid lumps of bulk phosphors is the basis for almost 40% of the enhancement in nanophosphors' intense red emission compared to the bulk. Moreover, the thermal stability of the nanophosphor is much better than the bulk phosphor, which clearly indicates a key advantage of nanophosphor. The superior performance of Eu3+-doped Y4Al2O9 nanophosphors over their bulk counterparts has been demonstrated for industrial phosphor-converted light-emitting diodes and visualization of latent fingerprint.

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“…Reducing the size of particle to nano dimensions cause increase in the surface-to-volume ratio of the material which leads to dominance of surface effects. [6][7][8][9][10] In addition to this, the presence of ligands/capping agents and surface-adsorbed ions/molecules (H 2 O, CO 2 ) also lead to luminescence quenching. Molecules in proximity to surface of nanoparticles can diminish the intensity, since the vibrational states of chemical bonds like O-H, C-H or N-H match the phonon states of the host material resulting in non-radiative relaxation of the excited lanthanide ions.…”

Section: Introductionmentioning

confidence: 99%

Studies on Morphology and Photoluminescent Properties of Tb3+ Doped YbPO4 Nanostructures Synthesized by Different Synthetic Methods

Khajuria¹,

Kumar²,

Tashi³

et al. 2020

ACSi

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The morphology dependent optical properties of Tb 3+ in YbPO 4 host lattice have been investigated. 10 % Terbium doped ytterbium phosphate (YbPO 4 :Tb 3+) nanostructures (NSs) were synthesized by five different synthetic methods i.e. sonochemical method, hydrothermal method, solvothermal method, sacrificial template method and coprecipitation method. Structural facets and optical properties of fabricated nanoparticles were studied in detail by powder X-ray diffraction (PXRD), Fourier transform infrared spectrum (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectra (EDS), and photoluminescence (PL) techniques. We have investigated the impact of synthetic procedures employed on the morphology and uniformity of synthesized NSs and consequently on the optical properties of the NSs. The intense green emission from the nanophosphor shows that phosphor can be used in IR-sensors, LEDs and as solar spectrum converters.

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Observation of exceptional strong emission transitions 5Dj (j=1−3) to 7Fj (j=1−3): Multicolor from single Eu3+ ion doped La2O3 nanoparticles

Cited by 26 publications

References 34 publications

Codoping of Yttria (Y₂O₃): Ho–Yb Nanoparticles with Li Increase Emitted Green Light Intensity for Security Ink and Bioimaging

Codoping of Yttria (Y₂O₃): Ho–Yb Nanoparticles with Li Increase Emitted Green Light Intensity for Security Ink and Bioimaging

Enhanced Photoluminescence Properties of Low-Dimensional Eu³⁺-Activated Y₄Al₂O₉ Phosphor Compared to Bulk for Solid-State Lighting Applications and Latent Fingerprint Detection-Based Forensic Applications

Studies on Morphology and Photoluminescent Properties of Tb3+ Doped YbPO4 Nanostructures Synthesized by Different Synthetic Methods

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Observation of exceptional strong emission transitions 5Dj (j=1−3) to 7Fj (j=1−3): Multicolor from single Eu3+ ion doped La2O3 nanoparticles

Cited by 26 publications

References 34 publications

Codoping of Yttria (Y2O3): Ho–Yb Nanoparticles with Li Increase Emitted Green Light Intensity for Security Ink and Bioimaging

Codoping of Yttria (Y2O3): Ho–Yb Nanoparticles with Li Increase Emitted Green Light Intensity for Security Ink and Bioimaging

Enhanced Photoluminescence Properties of Low-Dimensional Eu3+-Activated Y4Al2O9 Phosphor Compared to Bulk for Solid-State Lighting Applications and Latent Fingerprint Detection-Based Forensic Applications

Studies on Morphology and Photoluminescent Properties of Tb3+ Doped YbPO4 Nanostructures Synthesized by Different Synthetic Methods

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Codoping of Yttria (Y₂O₃): Ho–Yb Nanoparticles with Li Increase Emitted Green Light Intensity for Security Ink and Bioimaging

Codoping of Yttria (Y₂O₃): Ho–Yb Nanoparticles with Li Increase Emitted Green Light Intensity for Security Ink and Bioimaging

Enhanced Photoluminescence Properties of Low-Dimensional Eu³⁺-Activated Y₄Al₂O₉ Phosphor Compared to Bulk for Solid-State Lighting Applications and Latent Fingerprint Detection-Based Forensic Applications