Recent progress in trivalent europium (Eu³⁺)-based inorganic phosphors for solid-state lighting: an overview

Abstract

Narrow band red emitting phosphors are a critical constituent, and it is still a bottleneck for the next generation smart displays and high-performance lighting (solid state lighting based white light...

Narrow-band dazzling red-emitting (LiCaLa(MoO4)3:Eu3+) phosphor with scheelite structure for hybrid white LEDs and LiCaLa(MoO4)3:Sm3+,Eu3+-based deep-red LEDs for plant growth applications

“…The energy transfer between different Eu 3+ ions was found to be negligible, which turns out as radiative emission in the ground state of Eu 3+ . The lifetime of the LCLM:Eu 3+ phosphor is greater than that of other reported red phosphors, such as the La 2− x Eu x (MoO 4 ) 3 nanophosphor, which has a lifetime of 0.49 ms. 36 NSYM:Eu 3+ has a lifetime of 0.56 ms, 37 while that of the Li 3 BaSrY 3 (MoO 4 ) 8 :Eu 3+ phosphor is 0.457 ms. 38 Also, K 0.7 Li 0.3 Eu(WO 4 ) 2 has a lifetime of 0.426 ms. 39 Given that there is zero concentration quenching, the lifetime increased with an increase in Eu 3+ concentration in the host lattice, which is comparable with the emission intensity plot of phosphors with increasing activators. For example, the EuAlO 3 and Eu 2 O 3 stoichiometric phosphors showed a luminescence decay of ∼24 μs and ∼12 μs, respectively.…”

“…Other authors reported that the absolute QE of LiEu(MoO 4 ) 2 is 24%, K 0.7 Li 0.3 Eu(WO 4 ) 2 has an IQE of 22.48%, and SrLa 0.5 Eu 0.5 MgSbO 6 exhibits a QY of 46.5%. 39…”

Acquisition of Emissive Single-Crystalline AEu(MoO4)2 (A = Na, K, Rb, and Cs) Double Molybdates by One-Pot Hydrothermal Synthesis: Relationship between Particle Morphology and Photoluminescence Properties

“…Any degeneracy in systems with orthorhombic or lower symmetry is eliminated by the crystal field. Each of the 7 F J ( J = 1 to 6) levels can be split into up to 2 J + 1 Stark sublevels leading to a fine structure, according to the symmetry . The Eu 3+ ion would have S 4 symmetry in NaEu­(MoO 4 ) 2 , while it would have C 2 and D 2 symmetry in KEu­(MoO 4 ) 2 and RbEu­(MoO 4 ) 2 and CsEu­(MoO 4 ) 2 , respectively. , It is assumed that the splitting of the emission spectrum occurred since the symmetry of these Eu 3+ sites decreases in the order S 4 for NaEu­(MoO 4 ) 2 , D 2 for RbEu­(MoO 4 ) 2 and CsEu­(MoO 4 ) 2 , and C 2 for KEu­(MoO 4 ) 2 .…”

Exploring the Feasibility of Eu(TTA)3TPPO as Pigment for Fluorescent Paint

“…In the current study, excitation spectra of the pigment under investigation revealed two peaks, registered at 466 and 538 nm with greater separation as depicted in Figure 5(a). Emission spectra of the pigment revealed intense emission peak due to their electrons in the 4f shell, one registered at 617 nm, allocated to 5 D 0 → 7 F 2 transition and a shoulder at 595 nm due to 5 D 0 → 7 F 1 transition (Figure 5(b)) [21], which portrayed color in the red region of the visible spectrum. The energy gap connecting the triplet state of ligands and the emissive state of Eu 3+ is responsible for the sensitization of Eu 3+ ion by chromophore ligands.…”