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

Abstract

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.

Structural, morphological, and photoluminescence properties of RE (RE = Dy3+, Eu3+, Sm3+)‐doped CaAlBO4 phosphor synthesized by combustion method

“…For different wavelengths the color coordinates in the CIE diagram are shown in Table 1. The calculated CIE coordinates show that the prepared phosphor has high color purity [38–40]. This phosphor could be used to make white‐LEDs and solid‐state lighting.…”

“…The calculated CIE coordinates show that the prepared phosphor has high color purity [38][39][40]. This phosphor could be used to make white-LEDs and solid-state lighting.…”

Tunable warm white light emission and energy transfer of Dy3+ co‐doped Sr2LaZrO5.5:Eu3+ phosphors

“…Figure 4a shows the excitation spectrum of Sr 2 LaZrO 5.5 :18%Eu 3+ phosphor, and the monitoring wavelength is 612 nm. It can be seen from the figure that there are three strong absorption peaks from 260 to 500 nm, which are the CTB broadband at 290 nm, 7 F 0 → 5 L 6 transition of Eu 3+ at 395 nm and 7 F 0 → 5 D 2 transition sharp peak of Eu 3+ at 467 nm [19]. Figure 4b shows the emission spectrum of Sr 2 LaZrO 5.5 :x%Eu 3+ (x = 3–21%) at the excitation wavelength of 290 nm.…”

“…5 L 6 transition of Eu 3+ at 395 nm and 7 F 0 ! 5 D 2 transition sharp peak of Eu 3+ at 467 nm [19]. Figure 4b shows the emission spectrum of Sr 2 LaZrO 5.5 :x%Eu 3+ (x = 3-21%) at the excitation wavelength of 290 nm.…”

Impact of Structural Changes on Energy Transfer in the Anion-Engineered Re3+:Y2O3 Through Low-Temperature Synthesis Approach

“…White light-emitting diodes (w-LEDs) have substantially replaced conventional light sources (incandescent and fluorescent lamps) owing to their outstanding features such as low energy consumption, high brightness, high luminous efficiency, and long operational lifetimes . Rare earths (RE 3+ )-doped phosphors for w-LEDs have garnered considerable attention due to their widespread applications in the field of lighting. , Among many RE-doped phosphors, Tb 3+ doped metal oxides are well-known for obtaining green emission. − However, Tb 3+ -doped materials suffer from a lower luminescence due to the weak and narrow absorption cross-section (σ abs ∼ 10 –20 cm 2 ) originating from spin-forbidden electric dipole transitions between 4 f energy levels of Tb 3+ . , To overcome this issue, codoping of Tb 3+ ions with Ce 3+ sensitizers has attracted significant attention due to their high absorption cross-section (σ abs ∼ 10 –19 cm 2 ) in the UV region stemming from the allowed 4 f -5 d transition, shorter luminescence lifetime, and overlapping 5 d energy states of Ce 3+ ions with Tb 3+ 5 D J excited states. − For instance, GdPO 4 :Ce 3+ /Tb 3+ nanorods have been reported to be efficient hosts for the energy transfer from Ce 3+ to Tb 3+ ions with 28% quantum efficiency . The study revealed that the energy transfer depends upon the oxidation state of Ce ions in the host since dispersing codoped (GdPO 4 :Ce 3+ /Tb 3+ ) sample into KMnO 4 (oxidizing agent) solution resulted in significant luminescence quenching due to a change in the oxidation state of Ce from Ce 3+ to Ce 4+ .…”