Figure - available from: Journal of Materials Science: Materials in Electronics
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CIE plot for CBP:xSm³⁺, yEu³⁺ phosphor (x = 5.0 & y = 0.0 to 10.0 mol%) at λex = 400. Inset plot reveals the color coordinate modulation with increasing Eu³⁺ concentration from 0.0 to 10.0 mol%
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Crystalline eulytite-type Ca3Bi(PO4)3 (CBP) phosphors activated with Sm³⁺ and combination of Sm³⁺ & Eu³⁺ ions have been prepared by co-precipitation technique. Phase and crystal structure have been recognized using X-ray diffraction analysis and Rietveld refinement. The Sm³⁺-doped CBP phosphor exhibits three emission peaks at 562, 598, and 644 nm u...
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In the present study, undoped ZnO, doped Zn0.99Fe0.01O and co-doped Zn(0.99−x)Fe0.01AlxO nanoparticles were prepared by the co-precipitation method. We also investigated the effects of Al co-doping on the physical properties of Zn0.99Fe0.01O nanoparticles by several characterization techniques. Besides, the structural characterization revealed that...
Citations
... The exchange and multipolar interaction may be used to carry out the ET from a sensitizer/donor (Tb 3+ ) ion to an activator/acceptor (Eu 3+ ) ion. Depending on Reisfeld's approximation and Dexter's ET formula for multipolar interaction, a correlation may be written as [39]: ...
... For interactions between dipole-dipole (d-d), dipole-quadrupole (d-q) and quadrupole-quadrupole (q-q), the parameter n value is to be 6, 8 and 10, respectively. The value of the parameter η 0 / η may be estimated via the proportion of relative emission intensities as [39,40]: ...
The melt quenching procedure has been followed to synthesize transparent Tb3+ singly activated and Tb3+/Eu3+ co-activated TeO2 –WO¬3 – K¬¬2O – ZnO – Bi2O3 (TWKZBi) glasses. The structural characteristics of the prepared TWKZBi glass samples were examined through X-ray diffraction (XRD). The existence of functional units corresponding to the different vibrations has been examined via Raman spectroscopy. The photoluminescent (PL) characteristics and energy transfer (ET) analysis in the Tb3+/Eu3+ co-activated TWKZBi glasses were investigated in depth. Several emission peaks have been observed in Tb3+ doped TWKZBi glasses under n-UV and blue excitations and the maximum luminescent intensity has been detected for 2.0 mol% of Tb3+ doped TWKZBi glass sample. The emission spectra of co-doped Tb3+ and Eu3+ ions in the TWKZBi glasses have been studied, and the maximum energy transfer efficiency is found to be 32.82% under n-UV excitation. The ET from sensitizer (Tb3+) to activator (Eu3+) ions happen through dipole-dipole (d-d) interaction, as confirmed by Dexter’s and Reisfeld’s approximation. The color-tunable emission in the prepared glass samples can be achieved via varying the content of activator ions. The decay profiles for the 5D4 level of Tb3+ ions diminish with varying the concentration of Eu3+ ions, confirming the energy transfer from Tb3+ to Eu3+ ions. Furthermore, temperature-dependent photoluminescence (TDPL) studies show that the Tb3+/Eu3+ co-doped TWKZBi glasses have good thermal stability. All the aforementioned results reveal the suitability of the Tb3+/Eu3+ co-activated TWKZBi glass samples for photonic applications.
... It shows that the host cation's Ba 2+ sites have successfully substituted by the Eu 3+ ions. The average crystallite sizes ( ) of BNNO and BNNO: xEu 3+ (x = 5.0 and 12.0 mol%) have been calculated using Scherrer formula presented as follows 19 : ...
Single‐phase barium sodium niobate phosphor (Ba2NaNb5O15: BNNO) doped with europium (Eu³⁺) ions have been synthesized by solid‐state reaction route. Pure and single‐phase formation with the tetragonal structure of the synthesized Eu³⁺‐doped BNNO (BNNO: Eu³⁺) phosphor was confirmed by X‐ray diffraction. The SEM image of BNNO sample indicates irregular morphology and nonuniform micron‐sized particle formation. The intense excitation peak located at 463 nm appeared in the excitation spectrum for BNNO: Eu³⁺ phosphors when monitored atred (615 nm) emission of Eu³⁺ ions. Under 463 nm excitation, the emission spectra for BNNO: Eu³⁺ exhibit dominant red (615 nm) emission peak. The luminescence intensity increases progressively up to the 10.0 mol% of Eu³⁺ ions and decreases further due to the concertation quenching effect. The energy transfer mechanism responsible for concentration quenching has been investigated in detail. The chromaticity coordinates assessed for BNNO: Eu³⁺ phosphors, which are located in the red region of Commission International de l'Eclairage 1931 diagram. The structural, morphological, and spectroscopic results attained for the synthesized phosphor (BNNO: Eu³⁺) demonstrate potential candidature as a red component phosphor in solid‐state lighting applications.
In this work, the Tb³⁺/Sm³⁺ doped and co-doped Y2O3 nano-phosphors have been prepared by solution combustion method. The structural and morphological analyses of Y2O3 nano-phosphors confirm its nano-crystalline structure. The EDS spectra reveal the evidence of Y, Sm, Tb and O elements in the co-doped phosphor. The excitation spectrum of the Tb³⁺/Sm³⁺ co-doped nano-phosphor contains the excitation bands due to Tb³⁺ and Sm³⁺ ions. The Tb³⁺ doped nano-phosphor gives intense green (541 nm) and slightly weak blue (483 nm) emissions upon 292 nm excitation. The critical distance and PL intensity per activator ion were calculated to identify the factor responsible for quenching the PL intensity. The PL intensity of green and blue emission bands decreases regularly via doping of Sm³⁺ ion. This occurs due to energy transfer from Tb³⁺ to Sm³⁺ ions. The energy transfer leads to improve the PL intensity of the orange red emission band of Sm³⁺ ion. The energy transfer has been verified by the lifetime measurements and the energy transfer efficiency is found to increase via doping of Sm³⁺ ion. The CIE diagrams show wide color tunability from the greenish yellow to reddish orange regions and the color purity of Tb³⁺ doped nano-phosphor also changes accordingly via Sm³⁺ doping. The CCT analysis of Tb³⁺/Sm³⁺ co-doped nano-phosphors indicates a warm nature of the emitted light. Therefore, the Tb³⁺/Sm³⁺ co-doped Y2O3 nano-phosphor may be applied in the field of display devices, color tunable devices and warm white LEDs.
