Energy transfer based emission analysis of (Tb3+, Sm3+): Lithium zinc phosphate glasses

Reddy, C. Parthasaradhi; Naresh, V.; Ramaraghavulu, R.; Rudramadevi, B. Hemalatha; Reddy, K.T. Ramakrishna; Buddhudu, S.

doi:10.1016/j.saa.2015.02.090

Cited by 44 publications

(5 citation statements)

References 27 publications

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“…For Ho 3+ single doped glass SFAC: 0.8H, eight absorption bands peaking at ~361, 386, 418, 453, 472, 485, 537, and 641 nm are clearly distinguished, which are attributed to the excitation from 5 I 8 ground state to the 3 H 6 , 5 G 4 , 5 G 5 , 5 G 6 + 5 F 1 , 5 F 2 , 5 F 3 , 5 S 2 + 5 F 4 , and 5 F 5 excited states of Ho 3+ ions, respectively. For the Sm 3+ single doped glass SFAC: 0.1S, the absorption peak at 401 nm is induced by the electronic transition 6 H 5/2 → 4 F 7/2 of Sm 3+ ions . The absorption spectrum of SFAC: 0.1C is due to the 4f → 5d electronic transition of Ce 3+ ions.…”

Section: Resultsmentioning

confidence: 98%

Near white light emission of Ce³⁺‐, Ho³⁺‐, and Sm³⁺‐doped oxyfluoride silicate glasses

2017

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The Ce3+‐, Ho3+‐, and Sm3+‐ single and co‐doped oxyfluoride silicate glasses for light emitting diodes are studied. These glasses were prepared by melt quenching method and their optical and structural properties were investigated by absorption spectra, photoluminescence spectra, Commission International de I'Eclairage chromaticity coordinates, X‐ray diffraction, and Fourier transform infrared spectra. It is found that the introduction of Al2O3 in glass composition can improve the emissions of Ho3+ and Sm3+. While the presence of B2O3 has the adverse effect and can suppress the emissions of Ho3+ and Sm3+. With substituting Na2O for CaO in the glass compositions, CaF2 crystals can be formed during the melt quenching process. We find the formation of CaF2 crystals can change the emission behavior of Ho3+ and Sm3+ ions. White light emissions can be achieved in the glasses and the luminescence colors can be tuned by varying the concentrations of the doped rare‐earth ions and the composition of glass matrix. The Ce3+‐, Ho3+‐, and Sm3+‐doped oxyfluoride silicate glasses presented here demonstrate promising applications in the fields of light emitting diodes.

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Section: Resultsmentioning

confidence: 98%

Near white light emission of Ce³⁺‐, Ho³⁺‐, and Sm³⁺‐doped oxyfluoride silicate glasses

2017

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“…Our experimental results indicated that energy transfer occurs between Tb 3+ and Sm 3+ ions. Spectral overlapping between the Sm 3+ absorption and the Tb 3+ emission spectra shows that the energy transfer occurs from Tb 3+ to Sm 3+ [43]. It's known that the absorption band around 477 nm of Sm 3+ ion overlap with the emission band of Tb 3+ around 488 nm [35].…”

Section: Resultsmentioning

confidence: 98%

Study on luminescent properties of Tb³⁺ and Sm³⁺ co-doped CaSiO₃ phosphors for white light emitting diodes

Khan

Dang

Jabarov

et al. 2019

Mater. Res. Express

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A series of CaSiO 3 :x%Tb 3+ , y%Sm 3+ compounds was synthesized by the conventional solid state reaction. X-ray diffraction, scanning electron microscopy, and energy dispersive x-ray spectroscopy investigations were conducted to determine crystal structure. The photoluminescence (PL) excitation spectrum of Tb 3+ and Sm 3+ doped compounds consists of a series of peaks corresponding to electronic transitions of Tb 3+ and Sm 3+ ions. The wavelength of 375 nm was optimal to excite the luminescence of Tb 3+ /Sm 3+ co-doped compounds. The PL emission spectrum consists of a set of intense lines at wavelengths of 415 nm, 436 nm, 457 nm, 488 nm, 543 nm, 586 nm, and 622 nm, corresponding to Tb 3+ electronic transitions of 5 D , respectively. The PL emission spectrum of the Sm 3+ doped compound has a series of three peaks located at wavelengths of 565 nm, 602 nm, and 648 nm, corresponding to the electronic transitions of Sm 3+ from 4 G 5/2 to 6 H 5/2 , 6 H 7/2 , and 6 H 9/2 , respectively. The energy level diagram was proposed. The lifetime measurements were conducted for all samples and energy transfer process was also examined by this way. The Commission Internationale de I'Eclairage chromaticity coordinates, correlated color temperature, and color rendering index of phosphors were determined and the results indicate that the obtained materials are optimal candidate for white LED applications.

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“…The value of η Dy /η Dy-Eu ratio can be approximated to the ratio of emission intensities (I Dy /I Dy-Eu ) and decay lifetimes (τ Dy /τ Dy-Eu ) for the present co-doping system. Therefore, using the decay lifetimes, the relations can be written as Equation (4) 59,63,64 : ), where n stands for 6, 8, and 10. The lifetimes versus concentration result showed a linear trend for n = 6, 8, and 10, with the best fit for n = 6, demonstrating the electric dipole-dipole interaction is liable for ET from Dy 3+ to Eu 3+ in the KZnBP glass.…”

Section: Resultsmentioning

confidence: 99%

“…The value of η Dy / η Dy‐Eu ratio can be approximated to the ratio of emission intensities ( I Dy / I Dy‐Eu ) and decay lifetimes ( τ Dy / τ Dy‐Eu ) for the present co‐doping system. Therefore, using the decay lifetimes, the relations can be written as Equation () 59,63,64 :

\begin{equation}{\tau }_{{\rm{Dy}}}/{\tau }_{{\rm{Dy}} - {\rm{Eu}}} \propto {C}^{n/3},\end{equation}

where τ Dy and τ Dy–Eu refer to the Dy 3+ lifetimes, co‐doped without and with Eu 3+ , respectively. The graph between

{\tau }_{{\rm{D}}( {{\rm{Dy}}^{3 + }} )}/{\tau }_{{\rm{D}}( {{\rm{Dy}}^{3 + }} ) - {\rm{A\ }}( {{\rm{Eu}}^{3 + }} )}

{\rm{\ and}}\

C_{{\rm{D}}( {{\rm{Dy}}^{3 + }} ) + {\rm{A}}( {{\rm{Eu}}^{3 + }} )}^{n/3}

was used to determine the multipole–multipole interaction, facilitating the ET process.…”

Section: Resultsmentioning

confidence: 99%

Excitation‐dependent energy transfer and color tunability in Dy³⁺/Eu³⁺ co‐doped multi‐component borophosphate glasses

et al. 2023

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Using the melt‐quench technique, potassium zinc borophosphate (KZnBP) glasses incorporated with Dy3+, Eu3+, and Dy3+/Eu3+ ions individually and combinedly were prepared, and their photoluminescence (PL)‐related features were investigated. The KZnBP glass containing an optimized content of Dy3+ (0.5 mol%) is co‐doped with Eu3+ in various contents, and the energy transfer (ET) process between them was studied at λexci = 349, 364, 387 (Dy3+), and 394 nm (Eu3+). The Dy3+/Eu3+ co‐doped system, when excited with Dy3+ excitations has resulted in a significant decrease in the intensity of Dy3+ peaks observed at 480 nm (4F9/2→6H15/2, blue) and 574 nm (4F9/2→6H13/2, yellow), with simultaneous enhancement of the intensity of Eu3+ peaks at 591 nm (5D0→7F1, orange) and 617 nm (5D0→7F2, red). This trend is due to the efficient energy transfer from Dy3+ to Eu3+, indicating that Eu3+ ions were sensitized by Dy3+ ions. Dexter's theory and the Inokuti–Hirayama (I–H) model revealed that the dipole–dipole interaction is accountable for the energy transfer from Dy3+ to Eu3+ through energy‐transfer channels [4F9/2(Dy3+)+7F1,2(Eu3+)→6H15/2(Dy3+)+5D2(Eu3+)] and [4F9/2(Dy3+)+7F0(Eu3+)→6H13/2(Dy3+)+5D0(Eu3+)]. The color coordinates of the Dy3+/Eu3+ co‐doped glasses under various excitations fall within the white light emission spectrum, indicating their potential application in warm white LEDs.

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Energy transfer based emission analysis of (Tb3+, Sm3+): Lithium zinc phosphate glasses

Cited by 44 publications

References 27 publications

Near white light emission of Ce³⁺‐, Ho³⁺‐, and Sm³⁺‐doped oxyfluoride silicate glasses

Near white light emission of Ce³⁺‐, Ho³⁺‐, and Sm³⁺‐doped oxyfluoride silicate glasses

Study on luminescent properties of Tb³⁺ and Sm³⁺ co-doped CaSiO₃ phosphors for white light emitting diodes

Excitation‐dependent energy transfer and color tunability in Dy³⁺/Eu³⁺ co‐doped multi‐component borophosphate glasses

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Energy transfer based emission analysis of (Tb3+, Sm3+): Lithium zinc phosphate glasses

Cited by 44 publications

References 27 publications

Near white light emission of Ce3+‐, Ho3+‐, and Sm3+‐doped oxyfluoride silicate glasses

Near white light emission of Ce3+‐, Ho3+‐, and Sm3+‐doped oxyfluoride silicate glasses

Study on luminescent properties of Tb3+ and Sm3+ co-doped CaSiO3 phosphors for white light emitting diodes

Excitation‐dependent energy transfer and color tunability in Dy3+/Eu3+ co‐doped multi‐component borophosphate glasses

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Near white light emission of Ce³⁺‐, Ho³⁺‐, and Sm³⁺‐doped oxyfluoride silicate glasses

Near white light emission of Ce³⁺‐, Ho³⁺‐, and Sm³⁺‐doped oxyfluoride silicate glasses

Study on luminescent properties of Tb³⁺ and Sm³⁺ co-doped CaSiO₃ phosphors for white light emitting diodes

Excitation‐dependent energy transfer and color tunability in Dy³⁺/Eu³⁺ co‐doped multi‐component borophosphate glasses