Synthesis of Sr5SiO4Cl6:Eu3+, NaAlSiO4:Tb3+ and Sr2P2O7:Dy3+ phosphors for solid state lighting applications

Ca Al O :Eu , Ca Al O :Dy and Ca Al O :Tb phosphors were synthesized using a combustion synthesis method. The prepared phosphors were characterized by X-ray powder diffraction for phase purity, by scanning electron microscopy for morphology, and by photoluminescence for emission and excitation measurements. The Ca Al O :Eu phosphors could be efficiently excited at 396 nm and showed red emission at 594 nm and 616 nm due to D → F and D → F transitions. Dy -doped phosphors showed blue emission at 482 nm and yellow emission at 573 nm. Ca Al O :Tb phosphors showed emission at 545 nm when excited at 352 nm. Concentration quenching occurred in both Eu and Dy phosphors at 0.5 mol%. Photoluminescence results suggested that the aluminate-based phosphor could be a potential candidate for application in environmentally friendly based lighting technologies.

Section: Photoluminescence Properties Of the Ca 2 Al 2 O 5 : Dy 3+ mentioning

confidence: 76%

Section: Resultsmentioning

confidence: 99%

Photoluminescence properties of Ca₂Al₂O₅:RE³⁺ (RE = Eu, Dy and Tb) phosphors for solid state lighting

Yerpude¹,

Panse

Dhoble

et al. 2017

“…The 5d–4f transition is responsible for the broad peak seen at 273 nm. Peaks at 345 and 365 nm are caused by 7 F 6 → 5 L 9 transitions, whereas 378 and 463 nm are caused by 7 F 6 → 5 D 3 transitions [32–35 ] as shown in Figure 9a. We note that excitation peaks located at 273 nm, 378 nm, and 463 nm are the most intense; therefore, we record the PL emission spectra at these wavelengths which are shown in Figure 9b,c,d.…”

Section: Resultsmentioning

confidence: 99%

Intensity enhancement of photoluminescence in Tb³⁺/Eu³⁺ co‐doped Ca₁₄Zn₆Al₁₀O₃₅ phosphor for WLEDs

Bhelave¹,

Kadam

Yerpude³

et al. 2023

This article focuses on the effect of monovalent cation doping on the optical properties of rare earth (RE = Eu3+, Tb3+) co‐doped Ca14Zn6Al10O35 which has been synthesized by a low temperature combustion method. Crystalline phase of the Ca14Zn6Al10O35 phosphor was examined and confirmed by X‐ray diffraction measurement. Under near‐ultraviolet light excitation Eu3+‐doped Ca14Zn6Al10O35 phosphor exhibit characterization of Eu3+ emission bands that are located at a maximum wavelength (λmax) of approximately 470 nm and other peaks centred at 593 nm and 615 nm, respectively. With Tb3+‐doped Ca14Zn6Al10O35 phosphor showing a green emission band centred at 544 nm under near‐ultraviolet range. Furthermore, we studied the energy transfer process in Eu3+/Tb3+pair and enhancement in photoluminescence (PL) intensity with doping different charge compensation. Here we obtained the optimum PL emission intensity of the phosphor in broad and intense visible spectral range which may be significant for the fabrication of white light emitting diodes (WLEDs).

“…Among them, the 352 nm peak had the highest intensity corresponding to the 6 H 15/2 → 4 F 9/2 excitation transition of Dy 3+ ions and was used to monitor the PL emission spectra of the phosphor. [ 27,28 ] The emission spectra of Dy 3+ ‐doped MgCaAl 10 O 17 phosphors for various concentrations of the activator corresponding to excitation wavelength 352 nm are presented in Figure 2. The emission spectra show two peaks, one at 476 nm wavelength in the blue light region and other at 573 nm wavelength in the yellow region.…”

Section: Resultsmentioning

confidence: 99%

Luminescence properties of MgCaAl₁₀O₁₇:RE³⁺ (RE³⁺ = Sm³⁺,Dy³⁺) phosphor for eco‐friendly solid‐state lighting applications

Yerpude¹,

Parshuramkar²,

Pawade

et al. 2022

Different concentrations of rare earth Sm 3+ -and Dy 3+ -activated MgCaAl 10 O 17 phosphors were synthesized using the combustion route and their detailed luminescence investigations are reported in this paper. The photoluminescence excitation spectra of Sm 3+ -and Dy 3+ -activated MgCaAl 10 O 17 phosphor show multiple peaks in the ultraviolet light region of the electromagnetic spectrum. The characteristic emission spectra of the MgCaAl 10 O 17 :Sm 3+ phosphor are located at 563 nm, 594 nm, and 644 nm, with the maximum emission intensity occurring at 594 nm. The emission spectra of the MgCaAl 10 O 17 :Dy 3+ phosphor show two emission peaks, one at 476 nm wavelength in the blue light region and the other at 573 nm wavelength in the yellow region. The above results suggest that the prepared phosphor can be suitable for applications in eco-friendly solid-state lighting.