An investigation about the luminescence mechanism of SrGa2O4:Eu3+ showing no detectable energy transfer from the host to the dopant ions

Cai, Xingyi; Mu, Zhongfei; Zhang, Shaoan; Zhu, Daoyun; Wang, Qiang; Yang, Yibin; Luo, Dongxiang; Wu, Fugen

doi:10.1016/j.jlumin.2018.04.019

Cited by 35 publications

(21 citation statements)

References 29 publications

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“…The DRS spectra of SrGa 2 O 4 along with the different Cu concentrations of SrGa 2 O 4 : x Cu 2+ are exhibited in Figure e. The host absorption edge starts from 280 nm, implying that the relevant band gap is about 5.15 eV, estimated with the well-known Kubelka–Munk formula and Tauc relationship, , which is consistent with the value of 5.25 eV reported in ref . When Cu ions are doped in the host lattice, the absorption profile is well retained with Cu concentration, and three bands could be observed.…”

Section: Resultssupporting

confidence: 87%

“…Among the prototypes of AB 2 O 4 material, SrGa 2 O 4 attracts us as it is one of the compounds with a compact structure and wide band gap, for example, which has played essential roles in photoluminescent materials, as it is doped with luminescent centers, such as Eu 3+ , Ce 3+ , Tb 3+ , Cr 3+ , or Bi 3+ . − Specially, the undoped SrGa 2 O 4 itself is an LPL material, with the afterglow duration time of about 3 min, implying that some trap levels already existing in the host have the capability to delay the emission. Thus, it is feasible to achieve the LPL phenomenon in SrGa 2 O 4 doped by Cu 2+ , which is not verified, and the relevant luminescence properties have not been reported before.…”

Section: Introductionmentioning

confidence: 99%

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Red-Emitting SrGa₂O₄:Cu²⁺ Phosphor with Super-Long Persistent Luminescence

Wang

Chen

et al. 2022

Chem. Mater.

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The red afterglow of current rare-earth-activated long persistent luminescence (LPL) phosphors is largely still less than 6 h, in contrast to the 20 or 30 h long blue-or green-emitting ones, becoming the main obstacle to realize their multiscenario applications in practice. Herein, we report a rare-earth-free redemitting LPL phosphor SrGa 2 O 4 :Cu 2+ that can exhibit an afterglow at about 622 nm lasting over 30 h, which can largely match with the luminance of current blue-or green-emitting LPL phosphors. We find that the Cu 2+ ion could be charged by ultraviolet light from 280 to 420 nm, and the emission has a very broad band with a full width at half-maximum of about 150 nm. Combining the thermoluminescence measurement and the first-principles calculation, we find that the O vacancies and the −1 charged Ga vacancies could store the holes and contribute to the LPL of SrGa 2 O 4 :Cu 2+ . Our results may dramatically promote and expand its potential applications and stimulate the research of the multicolor LPL phosphors in future.

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Section: Resultssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Red-Emitting SrGa₂O₄:Cu²⁺ Phosphor with Super-Long Persistent Luminescence

Wang

Chen

et al. 2022

Chem. Mater.

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“…Doping of lanthanide ions in a suitable host has been proven as an effective protocol to achieve desired luminescence. − When lanthanides are doped in a host, their ladder-like energy levels split further into Stark sublevels due to the presence of the host material’s ligand field. As the inner 4f shells of the lanthanides are effectively shielded by outer 5s, 5p orbitals, the spectra generated from intra-4f transitions are sharp enough to have high color purity.…”

Section: Introductionmentioning

confidence: 99%

ZnAl₂O₄:Eu³⁺ Nanoparticle Phosphors Co-doped with Li⁺ for Red Light-Emitting Diodes

Samanta

Dey

et al. 2021

ACS Appl. Nano Mater.

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In recent years, rare-earth doped phosphors have gathered immense attention in the luminescence field for lighting and electronic display applications. However, the unavailability of an efficient and low-cost red phosphor is a major challenge for the widespread deployment of white light-emitting diodes (WLEDs) for practical purposes. Here we report red light-emitting Li+ co-doped ZnAl2O4:Eu3+ nanophosphors synthesized by a modified sol–gel route. These nanophosphors show excellent red emission due to the 5D0 → 7F j (j = 1, 2, 3, and 4) transition of Eu3+ ions under 394 nm excitation. Li+ co-doped ZnAl2O4:Eu3+ nanophosphors exhibit an almost 2-fold increase in photoluminescence (PL) intensity upon incorporation of the optimum amount of Li+ in the ZnAl2O4:Eu3+ matrix. Apart from that, Li+ co-doping leads to the improvement of CIE coordinates that is also reflected from the enhanced color purity offered by the co-doped nanophosphors. Steady-state as well as time-resolved PL spectra clearly reveal that addition of Li+ co-activator successfully reduces nonradiative transitions in the co-doped nanophosphors. Introduction of Li+ in Eu3+ doped ZnAl2O4 effectively neutralizes the charge imbalance problem and thus leads to a significant increase in the PL efficiency of the nanophosphors. The red LED fabricated by those co-doped nanophosphors exhibits strong red emission under a driving voltage of 3 V. Obtained results strongly highlight the bright prospect of Li+ co-doped ZnAl2O4:Eu3+ nanophosphors in the LED and display applications.

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“…Therefore, charge transfer bands act as a sensitizer in the excitation of Eu 3+ . Cai et al [74] reported an effective charge transfer absorption in SrGa 2 O 4 :Eu 3+ phosphors. However, in the current study, the charge transfer (CT) absorption band is not effective, as there is an f!f transition of Eu 3+ due to weak interactions between Eu 3+ -O 2À and similar observations have been reported…”

Section: Morphology Of Phosphor Materialsmentioning

confidence: 99%

Structural and optical properties of a new Milarite type Na₃Mg₄LiSi₁₂O₃₀:Eu³⁺ phosphor

et al. 2022

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A new red-emitting Eu 3+ (1À17 mol%)-doped Na 3 Mg 4 LiSi 12 O 30 (NMLS) phosphor was prepared using a conventional solid-state reaction method at low temperature.The prepared samples belong to a hexagonal structure with a good match to JCPDS card no. 73-0934. The photoluminescence (PL) emission spectrum showed an intense peak at 612 nm when excited at 393 nm. The variation of electric dipole transition ( 5 D 0 -7 F 2 ) emission intensity with increasing Eu 3+ ion concentration was investigated. The concentration quenching at 11 mol% is due to the dipole-dipole interaction mechanism in the NMLS host. The optimized NMLS:Eu 3+ phosphor shows 2.18 times higher luminescence intensity than the (Y,Gd)BO 3 (YGB) commercial phosphor. The NMLS:Eu 3+ showed an intense red emission, having Commission Internationale de l'éclairage (CIE) coordinates (0.6280, 0.3691) and colour purity of 99.2%.The resulting phosphor exhibits good thermal stability of 80% at 423 K. The magnified images of fingerprint showed various minute features such as bridges, sweat pores, ridge end, bifurcation, island and core with better visualization under 393 nm excitation. Furthermore, the optimized NMLS:Eu 3+ was used for pc-LED, latent fingerprints, and anticounterfeit applications as a promising red phosphor.

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An investigation about the luminescence mechanism of SrGa2O4:Eu3+ showing no detectable energy transfer from the host to the dopant ions

Cited by 35 publications

References 29 publications

Red-Emitting SrGa₂O₄:Cu²⁺ Phosphor with Super-Long Persistent Luminescence

Red-Emitting SrGa₂O₄:Cu²⁺ Phosphor with Super-Long Persistent Luminescence

ZnAl₂O₄:Eu³⁺ Nanoparticle Phosphors Co-doped with Li⁺ for Red Light-Emitting Diodes

Structural and optical properties of a new Milarite type Na₃Mg₄LiSi₁₂O₃₀:Eu³⁺ phosphor

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An investigation about the luminescence mechanism of SrGa2O4:Eu3+ showing no detectable energy transfer from the host to the dopant ions

Cited by 35 publications

References 29 publications

Red-Emitting SrGa2O4:Cu2+ Phosphor with Super-Long Persistent Luminescence

Red-Emitting SrGa2O4:Cu2+ Phosphor with Super-Long Persistent Luminescence

ZnAl2O4:Eu3+ Nanoparticle Phosphors Co-doped with Li+ for Red Light-Emitting Diodes

Structural and optical properties of a new Milarite type Na3Mg4LiSi12O30:Eu3+ phosphor

Contact Info

Product

Resources

About

Red-Emitting SrGa₂O₄:Cu²⁺ Phosphor with Super-Long Persistent Luminescence

Red-Emitting SrGa₂O₄:Cu²⁺ Phosphor with Super-Long Persistent Luminescence

ZnAl₂O₄:Eu³⁺ Nanoparticle Phosphors Co-doped with Li⁺ for Red Light-Emitting Diodes

Structural and optical properties of a new Milarite type Na₃Mg₄LiSi₁₂O₃₀:Eu³⁺ phosphor