Judd-Ofelt itemization and influence of energy transfer on Sm3+ ions activated B2O3–ZnF2–SrO–SiO2 glasses for orange-red emitting devices

A very convenient and energy-saving route named Solution-Combustion Synthesis had been adopted to prepare a sequence of Sr 6 Y 2 Al 4 O 15 :Eu 3? (1.0-5.0 mol%) nanophosphorshaving an excellent luminescence which is very requisite in the solid-state illumination sector. The monoclinic phase and the crystallinity of the prepared samples were confirmed by Powder X-Ray Diffraction and the Rietveld refinement technique. Non-uniformity and somewhat agglomeration of particles having a size between 32 nm and 62 nm, were observed during morphological probes via Scanning and Transmission Electron Microscopies. The red-light emission was due to electronic transition from 5 D 0 ? 7 F 2 states which is purely electric-dipole allowed transition. Dexter's approach as well as Inokuti-Hirayama model,were cast-off to look into photoluminescent properties. Both these models confirmed the multipolar interactions as the main cause for concentration quenching after 3.0 mol% of Europium(III) content. Various other radiative properties such as decay-time, quantum efficiency, non-radiative relaxation rates were also determined. Red light parameters like Color Coordinate Temperature and Commission International de I'Eclairage color coordinates were also evaluated which confirmed the potential candidature of the prepared nanophosphors for the most recent version of wLEDs, lasers, sensors, advanced solar cells, etc.

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“…For the given nanopowders, DET amongst adjacent Eu 3? ions is dominant that can be confirmed from decaydata [32].…”

Section: Optical Analysis and Mechanism Of Energy Transfersupporting

confidence: 59%

Optical, crystallographic and Judd–Ofelt analysis of europium doped Sr6Y2Al4O15 nanocrystals for NUV-WLED fabrication

Dalal

Sehrawat

Sheoran

et al. 2021

J Mater Sci: Mater Electron

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“…Excitations at 376 nm and 404 nm might be due to the 6 H 5/2 → 4 F 7/2 and 6 H 5/2 → 4 F 7/2 transitions of Sm 3+ ions. [ 39,40 ]…”

Section: Resultsmentioning

confidence: 99%

“…4 F 7/2 transitions of Sm 3+ ions. [39,40] On excitation of the YZO phosphors with 376 nm and 404 nm wavelengths, a broad emission peak was shown ranging from 500 to 700 nm with peaks positioned at 563, 600, and 648 nm, as displayed in Figure 8(a) and (b) respectively. As displayed in Figure 8(a) and (b), three distinguishing peaks were observed in the PL emission spectra of the Sm 3+ -activated YZO phosphor positioned at 563 nm, 600 nm, and 648 nm.…”

Section: Photoluminescence Studiesmentioning

confidence: 97%

Luminescence study of Sm³⁺,Eu³⁺‐doped Y₂Zr₂O₇ host: optical investigation of greenish yellow to red colour tunable pyrochlore phosphor

et al. 2022

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Pyrochlore phosphors have shown their worth in modern day lighting in the last few years. Colour tunability of the phosphor is one of the modern techniques used to obtain white light‐emitting diodes (WLEDs). In the proposed work, Y2Zr2O7:Sm3+,Eu3+ phosphors were investigated for WLED applications as well as display devices. A convectional solid‐state diffusion method was used to synthesize the proposed phosphors. X‐ray diffraction of the proposed phosphors was performed and compared with the standard Inorganic Crystal Structure Database. The crystal structure of the sample was cubic in nature, obtained from Rietveld refinement. Vibrational and morphological studies on the samples were carried out using Fourier transform infrared spectroscopy and scanning electron microscopy analysis. The photoluminescence study of the colour tunable phosphor showed the characteristic peak of Sm3+ together with the two sharp peaks of Eu3+ ions. Greenish yellow to red colour tunability was observed in the proposed phosphor with enhancement of Eu3+ ions. All these results showed the worth of this sample for WLEDs applications as well as in display devices.

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“…According to Dexter's theory, the values for multipolar interaction constant ( θ ) could be six for d–d (dipole–dipole), eight for d–q (dipole–quadruple) and ten for q–q (quadruple–quadruple) interactions. [ 65,66 ] Based on the photoluminescence data of La 2 Zr 2 O 7 :0.5 at% Bi 3+ , y at% Eu 3+ ( y = 1, 2, 3, 4 and 5) samples, a plot between log( I / X ) versus log( X ) shown in Figure 8 is identified to be a linear fitted curve with slope value ( θ /3) equal to −2.65. Hence, the value of multipolar interaction constant ( θ ) is determined to be 7.95 (i.e.…”

Section: Resultsmentioning

confidence: 99%

Tunable luminescence from Bi³⁺ sensitized La₂Zr₂O₇:Eu³⁺ red nanophosphors for display applications

Kumar

Venkatarao

Shaik³

et al. 2022

Luminescence

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Bismuth ion (Bi3+) sensitized, europium ion (Eu3+) activated La2Zr2O7 nanophosphors are prepared successfully by simple wet chemical method. Strong blue emission of singly doped La2Zr2O7 with Bi3+ was observed at 310 nm excitation, its wide emission spectrum has a peak maximum at 465 nm ascribed to electronic transition 3P1 → 1S0 of Bi3+. The recorded photoluminescence spectra of y at% Eu3+ codoped La2Zr2O7, when excited at 285 nm, the emission spectrum exhibits maximum peaks at wavelength values 615 nm, 646 nm and 665 nm which are ascribed to 5D0 → 7F2, 5D0 → 7F3 and 5D0 → 7F4 transitions of Eu3+ respectively. The chromaticity coordinates for the optimized sample were found to be (0.519, 0.329). Sensitizing with Bi3+ can affect the luminescence properties of La2Zr2O7:Eu3+ phosphors. With reference to the change in Eu3+ concentration from Y = 1, 2, 3, 4 and 5%, color tunable luminescence from blue to orange, red of La2Zr2O7:Bi3+,Eu3+ phosphors are observed. The lifetime decay values, energy level description and CIE chromatic color coordinates for Bi3+, Eu3+ in La2Zr2O7:Bi3+,Eu3+ codoped sample was discussed. The spectral overlap between sensitizer, activator ions confirms the efficient energy transfer from Bi3+ to Eu3+ in La2Zr2O7:Bi3+,Eu3+ codoped sample and is via a dipole‐quadruple mechanism.

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Judd-Ofelt itemization and influence of energy transfer on Sm3+ ions activated B2O3–ZnF2–SrO–SiO2 glasses for orange-red emitting devices

Cited by 50 publications

References 67 publications

Optical, crystallographic and Judd–Ofelt analysis of europium doped Sr6Y2Al4O15 nanocrystals for NUV-WLED fabrication

Optical, crystallographic and Judd–Ofelt analysis of europium doped Sr6Y2Al4O15 nanocrystals for NUV-WLED fabrication

Luminescence study of Sm³⁺,Eu³⁺‐doped Y₂Zr₂O₇ host: optical investigation of greenish yellow to red colour tunable pyrochlore phosphor

Tunable luminescence from Bi³⁺ sensitized La₂Zr₂O₇:Eu³⁺ red nanophosphors for display applications

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Judd-Ofelt itemization and influence of energy transfer on Sm3+ ions activated B2O3–ZnF2–SrO–SiO2 glasses for orange-red emitting devices

Cited by 50 publications

References 67 publications

Optical, crystallographic and Judd–Ofelt analysis of europium doped Sr6Y2Al4O15 nanocrystals for NUV-WLED fabrication

Optical, crystallographic and Judd–Ofelt analysis of europium doped Sr6Y2Al4O15 nanocrystals for NUV-WLED fabrication

Luminescence study of Sm3+,Eu3+‐doped Y2Zr2O7 host: optical investigation of greenish yellow to red colour tunable pyrochlore phosphor

Tunable luminescence from Bi3+ sensitized La2Zr2O7:Eu3+ red nanophosphors for display applications

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Product

Resources

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Luminescence study of Sm³⁺,Eu³⁺‐doped Y₂Zr₂O₇ host: optical investigation of greenish yellow to red colour tunable pyrochlore phosphor

Tunable luminescence from Bi³⁺ sensitized La₂Zr₂O₇:Eu³⁺ red nanophosphors for display applications