Effect of Mg2+ and TiIV doping on the luminescence of Y2O2S:Eu3+

Hölsä, Jorma; Laamanen, Taneli; Lastusaari, Mika; Malkamäki, Marja; Niittykoski, Janne; Zych, Eugeniusz

doi:10.1016/j.optmat.2009.01.018

Cited by 38 publications

(28 citation statements)

References 7 publications

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“…One may observe that the majority of published works are about Eu 2+ doped materials. Despite this majority, other materials containing different dopants, such as Tb 3+ [5][6][7][8], Eu 3+ [9,10], Mn 2+ [11,12] or Ti [13,14] also show efficient persistent luminescence. Among these materials, those doped with Tb 3+ ions perform the best though only very recently the first persistent luminescence mechanism based on solid experimental data for a Tb 3+ doped material was developed [5].…”

Section: Introductionmentioning

confidence: 99%

Persistent luminescence behavior of materials doped with Eu^2+ and Tb^3+

Rodrigues¹,

Brito²,

Hölsä³

et al. 2012

Opt. Mater. Express

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Abstract:In this work, the persistent luminescence mechanisms of Tb 3+ (in CdSiO 3 ) and Eu 2+ (in BaAl 2 O 4 ) based on solid experimental data are compared. The photoluminescence spectroscopy shows the different nature of the inter-and intraconfigurational transitions for Eu 2+ and Tb 3+ , respectively. The electron is the charge carrier in both mechanisms, implying the presence of electron acceptor defects. The preliminary structural analysis shows a free space in CdSiO 3 able to accommodate interstitial oxide ions needed by charge compensation during the initial preparation. The subsequent annealing removes this oxide leaving behind an electron trap. Despite the low band gap energy for CdSiO 3 , determined with synchrotron radiation UV-VUV excitation spectroscopy of Tb 3+ , the persistent luminescence from Tb 3+ is observed only with UV irradiation. The need of high excitation energy is due to the position of 1 and the ligand-to-metal charge-transfer transitions. Finally, the persistent luminescence mechanisms are constructed and, despite the differences, the mechanisms for Tb 3+ and Eu 2+ proved to be rather similar. This similarity confirms the solidity of the interpretation of experimental data for the Eu 2+ doped persistent luminescence materials and encourages the use of similar models for other persistent luminescence materials.

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Section: Introductionmentioning

confidence: 99%

Persistent luminescence behavior of materials doped with Eu^2+ and Tb^3+

Rodrigues¹,

Brito²,

Hölsä³

et al. 2012

Opt. Mater. Express

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“…Titanium is an external transition metal and presents an electronic configuration [Ar]3d 2 4s 2 . The origin of its luminescence occurs through 3d→3d transitions, which are generated from its trivalent form (Ti 3+ :[Ar]3d 1 ) . The tetravalent Ti IV ([Ar]3d 0 ), in inorganic materials, may also exhibit charge transfer transitions from oxygen 2p to external Ti IV orbitals, i.e.…”

Section: Introductionmentioning

confidence: 99%

Structural and optical properties of europium‐ and titanium‐doped Y₂O₃ nanoparticles

et al. 2019

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Luminescent nanoparticles of Y 2 O 3 doped with europium (Eu) and/or titanium (Ti) were synthesized using modified sol-gel routes. The crystalline cubic phase was confirmed using X-ray powder diffraction (XRD). Particle morphology and size were evaluated using scanning and transmission electron microscopy. High-resolution transmission electron microscopy showed that the synthesis method affected the average particle size and the Fourier transform of the images showed the lattice plane distances, indicating that the samples presented high crystallinity degree in accordance with the XRD pattern. The Ti valence was investigated using X-ray absorption near edge spectroscopy and the tetravalent form was the dominant oxidizing state in the samples, mainly in Eu and Ti co-doped Y 2 O 3 . Optical behaviour was investigated through X-ray excited optical luminescence and photoluminescence under ultraviolet-visible (UV-vis) and vacuum ultraviolet (VUV) excitation. Results indicated that Eu 3+ is the emitting centre in samples doped with only Eu and with both Eu and Ti with the 5 D 0 ! 7 F 2 transition as the most intense, indicating Eu 3+ in a noncentrosymmetric site. Finally, in the Eu,Ti-doped Y 2 O 3 system, Ti 3+ (or Ti IV ) excitation was observed but no Ti emission was present, indicating a very efficient energy transfer process from Ti to Eu 3+ . These results can aid the development of efficient nanomaterials, activated using UV, VUV, or X-rays. K E Y W O R D Scoconut water, energy transfer, luminescence, proteic sol-gel, synchrotron radiation, Y 2 O 3

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“…Persistent phosphors, which continuously emit for minutes to hours after termination of the excitation source, have long attracted great interest because of their wide applications, such as in security signs, traffic signs, and emergency route signs. Currently, several long-persistent phosphors (LPPs), such as CaAl2O4:Eu 2+ , Nd 3+ (blue emission, >5 h) [1], SrAl2O4:Eu 2+ , Dy 3+ (green emission, >30 h) [2], and Y2O2S:Eu 3+ , Mg 2+ , Ti 4+ (red emission, >5 h) [3], have been commercialized as night-vision materials for various important innovations. In recent years, near-infrared (NIR) LPPs for biomedical imaging applications have been extensively developed [4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Germanium substitution endowing Cr3+-doped zinc aluminate phosphors with bright and super-long near-infrared persistent luminescence

Zhang

Huang

et al. 2018

Acta Materialia

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We present novel near-infrared (NIR) Cr 3+-doped non-gallate superlong-persistence phosphors (Zn1+xAl2-2xGexO4:Cr 3+) by Germanium substitution in the original ZnAl2O4:Cr 3+. Unlike the negligible NIR persistent luminescence of ZnAl2O4:Cr 3+ upon UV or visible light excitation, the Ge substituted phosphors feature strong and super-long-persistent luminescence at approximately 650-750 nm for more than 120 h. The relation between the Ge substitution and the defect trapping states is investigated systematically. The experimental results combined with the first-principles calculations reveal that Ge ○○ Zn and Ge ○ Al in the spinel structure would introduce shallow and deep defect states in the band gap to serve as new efficient traps, which are mainly responsible for the strong and super-long-persistent luminescence upon UV or visible light excitation. The present advanced phosphors is an alternative candidate for applications in biomedical imaging and night-vision surveillance.

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Effect of Mg2+ and TiIV doping on the luminescence of Y2O2S:Eu3+

Cited by 38 publications

References 7 publications

Persistent luminescence behavior of materials doped with Eu^2+ and Tb^3+

Persistent luminescence behavior of materials doped with Eu^2+ and Tb^3+

Structural and optical properties of europium‐ and titanium‐doped Y₂O₃ nanoparticles

Germanium substitution endowing Cr3+-doped zinc aluminate phosphors with bright and super-long near-infrared persistent luminescence

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Effect of Mg2+ and TiIV doping on the luminescence of Y2O2S:Eu3+

Cited by 38 publications

References 7 publications

Persistent luminescence behavior of materials doped with Eu^2+ and Tb^3+

Persistent luminescence behavior of materials doped with Eu^2+ and Tb^3+

Structural and optical properties of europium‐ and titanium‐doped Y2O3 nanoparticles

Germanium substitution endowing Cr3+-doped zinc aluminate phosphors with bright and super-long near-infrared persistent luminescence

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Structural and optical properties of europium‐ and titanium‐doped Y₂O₃ nanoparticles