Tunable photoluminescence properties and energy transfer in oxyapatite-based Ca2Tb8(SiO4)6:Eu3+ phosphors for UV-LEDs

Yang, Chang-Hao; Das, Subrata; Lu, Chung‐Hsin

doi:10.1016/j.jlumin.2015.08.009

Cited by 28 publications

(3 citation statements)

References 41 publications

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“…Oxyapatite-based Ca 2 Tb 8 (SiO 4 ) 6 : x Eu 3+ phosphors showed orange-red emissions due to the presence of both Tb and Eu ions in the lattice. 208 The systematic increase of concentration of Eu ion in the lattice leads to enhancement in the energy transfer (proceeds through dipole–dipole interaction) efficiency from Tb to Eu ion. In the meantime, the selected phosphor compositions ( x = 0.6) showed excellent thermal stability with an activation energy of 0.027 eV.…”

Section: Eu3+ Based Phosphors With Scheelite and Double Perovskite Re...mentioning

confidence: 99%

Recent progress in trivalent europium (Eu³⁺)-based inorganic phosphors for solid-state lighting: an overview

Singh¹,

Pradhan²,

Priya³

et al. 2023

Dalton Trans.

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Section: Eu3+ Based Phosphors With Scheelite and Double Perovskite Re...mentioning

confidence: 99%

Recent progress in trivalent europium (Eu³⁺)-based inorganic phosphors for solid-state lighting: an overview

Singh¹,

Pradhan²,

Priya³

et al. 2023

Dalton Trans.

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“…Increasing the doping amount of Ce 3+ ions to x = 0.06 led to an increase in the emission intensity of Sr 2−x Ce x Si 5 N 8 . However, a further increase in the concentration of Ce 3+ ions reduced the emission intensity due to the self concentration quenching phenomena36. The self-concentration quenching effects between two Ce 3+ ions may be owing to the non-radiative energy transfer between two Ce 3+ ions.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Sr2Si5N8:Ce3+ phosphors for white LEDs via efficient chemical vapor deposition

Yang

Som

Das

et al. 2017

Sci Rep

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Novel chemical vapor deposition (CVD) process was successfully developed for the growth of Sr2Si5N8:Ce3+ phosphors with elevated luminescent properties. Metallic strontium was used as a vapor source for producing Sr3N2 vapor to react with Si3N4 powder via a homogeneous gas-solid reaction. The phosphors prepared via the CVD process showed high crystallinity, homogeneous particle size ranging from 8 to 10 μm, and high luminescence properties. In contrast, the phosphors prepared via the conventional solid-state reaction process exhibited relative low crystallinity, non-uniform particle size in the range of 0.5–5 μm and relatively lower luminescent properties than the phosphors synthesized via the CVD process. Upon the blue light excitation, Sr2−xCexSi5N8 phosphors exhibited a broad yellow band. A red shift of the emission band from 535 to 556 nm was observed with the increment in the doping amount of Ce3+ ions from x = 0.02 to x = 0.10. The maximum emission was observed at x = 0.06, and the external and internal quantum efficiencies were calculated to be 51% and 71%, respectively. Furthermore, the CVD derived optimum Sr1.94Ce0.06Si5N8 phosphor exhibited sufficient thermal stability for blue-LEDs and the activation energy was calculated to be 0.33 eV. The results demonstrate a potential synthesis process for nitride phosphors suitable for light emitting diodes.

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“…On the other perspective, SAO:Pr 3+ NPs exhibit a monotonic decreasing PL intensity behavior. I QE is the ratio of integrated PL intensity between 10 and 300 K, where 100% internal efficiency is assumed at 10 K as the low temperature declines from 66.3% (undoped) to 45.5% (5% Pr). , This specifies a qualified ∼46% drop in the I QE on 5% Pr doping compared to the original SAO NPs. The introduction of Pr doping impacts the recombination of electrons and holes on the surface of SAO, decreasing photoluminescence (PL) intensity as the Pr content increases.…”

Section: Resultsmentioning

confidence: 99%

Orange–Red Emitting Sr₉Al₆O₁₈:Pr³⁺ Nanophosphors for Advanced Latent Fingerprints and Security Ink

Swathi,

Krushna,

Manjunatha

et al. 2023

ACS Appl. Nano Mater.

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This study presents the synthesis of orange–red emitting Sr9Al6O18:Pr3+ nanophosphors (SAO:Pr3+ NPs) through the solution combustion process. Photoluminescence (PL) spectra revealed concentration quenching at 5 mol % with a critical distance of R C = 21.5 Å, indicating that electric multipolar interactions are responsible for the nonradiative energy transfer in the SAO lattice. Dexter’s theory confirmed the quadruple–quadruple interaction as the mechanism behind the quenching. The optimized SAO:5Pr3+ NPs exhibited exceptional properties, including high color purity (CP = 94.2%), cost-effectiveness, eco-friendliness, scalability, and photostability. A fluorescence-based technique was developed using powder dusting to apply latent fingerprint (LFP) visualization and preservation. This method demonstrated high sensitivity, contrast, and no background interference, enabling the detection of LFPs over extended periods. Furthermore, lip prints (LPs), known for their sex differences and stability, have been effectively utilized for reliable and efficient forensic investigations. An unclonable invisible security ink was developed to combat counterfeiting, exhibiting high stability against UV light, aging, and physical abrasion. Mathematical models were employed for various fingerprint image processing tasks, including segmentation, normalization, ridge orientation estimation, ridge frequency estimation, Gabor filtering, binarization, thinning, and minutiae extraction. These algorithms were implemented by using a Python-based environment, resulting in enhanced fingerprints that displayed level I–II features. These findings underscore the potential applications of SAO:Pr3+ NPs in advanced forensic science and data security. This study offers insights into the synthesis, characterization, and application of SAO:Pr3+ NPs, highlighting their suitability for advanced forensic investigations, data security, and anticounterfeiting measures.

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Tunable photoluminescence properties and energy transfer in oxyapatite-based Ca2Tb8(SiO4)6:Eu3+ phosphors for UV-LEDs

Cited by 28 publications

References 41 publications

Recent progress in trivalent europium (Eu³⁺)-based inorganic phosphors for solid-state lighting: an overview

Recent progress in trivalent europium (Eu³⁺)-based inorganic phosphors for solid-state lighting: an overview

Synthesis of Sr2Si5N8:Ce3+ phosphors for white LEDs via efficient chemical vapor deposition

Orange–Red Emitting Sr₉Al₆O₁₈:Pr³⁺ Nanophosphors for Advanced Latent Fingerprints and Security Ink

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Tunable photoluminescence properties and energy transfer in oxyapatite-based Ca2Tb8(SiO4)6:Eu3+ phosphors for UV-LEDs

Cited by 28 publications

References 41 publications

Recent progress in trivalent europium (Eu3+)-based inorganic phosphors for solid-state lighting: an overview

Recent progress in trivalent europium (Eu3+)-based inorganic phosphors for solid-state lighting: an overview

Synthesis of Sr2Si5N8:Ce3+ phosphors for white LEDs via efficient chemical vapor deposition

Orange–Red Emitting Sr9Al6O18:Pr3+ Nanophosphors for Advanced Latent Fingerprints and Security Ink

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Recent progress in trivalent europium (Eu³⁺)-based inorganic phosphors for solid-state lighting: an overview

Recent progress in trivalent europium (Eu³⁺)-based inorganic phosphors for solid-state lighting: an overview

Orange–Red Emitting Sr₉Al₆O₁₈:Pr³⁺ Nanophosphors for Advanced Latent Fingerprints and Security Ink