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Lin, Yuanhua; Tang, Zilong; Zhang, Zhongtai; Wang, Xiaoxin; Zhang, Junying

doi:10.1023/a:1017930630889

Cited by 248 publications

(93 citation statements)

References 2 publications

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“…Moreover, their blue-green emission [19] corresponds better than any other phosphor to the sensitivity of the human eye in the dark [52]. Finally, despite the apparent complexity of its stoichiometry, the tetragonal Sr 2 MgSi 2 O 7 structure (Fig.…”

Section: Introductionmentioning

confidence: 95%

Understanding Persistent Luminescence: Rare-Earth- and Eu²⁺-doped Sr₂MgSi₂O₇

Lastusaari

Jungner

Kotlov

et al. 2014

Zeitschrift Für Naturforschung B

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Similar to many other Eu 2+ ,RE 3+ -co-doped persistent luminescence materials, for Sr 2 MgSi 2 O 7 :Eu 2+ ,RE 3+ the initial intensity and duration of persistent luminescence was also found to depend critically on the rare-earth (RE) co-doping. An enhancement of 1 -2 orders of magnitude in these properties could be obtained by Dy 3+ co-doping whereas total quenching of persistent luminescence resulted from the use of Sm 3+ and Yb 3+ . To solve this drastic disparity, the effects of the individual RE 3+ ions were studied with thermoluminescence (TL) spectroscopy to derive information about the formation of traps storing the excitation energy. The charge compensation defects were concluded to be the origin of the complex TL glow curve structure. The tuning of the band gap of the Sr 2 MgSi 2 O 7 host and especially the position of the bottom of the conduction band due to the Eu 2+ ,RE 3+ co-doping was measured with the synchrotron radiation vacuum UV (VUV) excitation spectra of the Eu 2+ dopant. The model based on the evolution of the band gap energy with RE 3+ co-doping was found to explain the intensity and duration of the persistent luminescence.

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Section: Introductionmentioning

confidence: 95%

Understanding Persistent Luminescence: Rare-Earth- and Eu²⁺-doped Sr₂MgSi₂O₇

Lastusaari

Jungner

Kotlov

et al. 2014

Zeitschrift Für Naturforschung B

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“…SrAl 2 O 4 :Eu,Dy [4]) or blue emitting (e.g. Sr 2 MgSi 2 O 7 :Eu,Dy [5]). The reason for this lack of efficient red persistent phosphors is twofold.…”

Section: Introductionmentioning

confidence: 99%

Temperature and wavelength dependent trap filling in M2Si5N8:Eu (M=Ca, Sr, Ba) persistent phosphors

Smet¹,

Eeckhout²,

Bos³

et al. 2012

Journal of Luminescence

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The evaluation of persistent phosphors is often focused on the processes right after the excitation, namely on the shape of the afterglow decay curve and the duration of the afterglow, in combination with thermoluminescence glow curve analysis. In this paper we study in detail the trap filling process in europium-doped alkaline earth silicon nitrides (Ca 2 Si 5 N 8 :Eu, Sr 2 Si 5 N 8 :Eu and Ba 2 Si 5 N 8 :Eu), i.e., how the persistent luminescence can be induced. Both the temperature at which the phosphors are excited and the spectral distribution of the excitation light on the ability to store energy in the phosphors' lattices are investigated. We show that for these phosphors this storage process is thermally activated upon excitation in the lower 5d excited states of Eu 2+ , with the lowest thermal barrier for europium doped Ca 2 Si 5 N 8 . Also, the influence of co-doping with thulium on the trap filling and afterglow behavior is studied. Finally there exists a clear relation between the luminescence quenching temperature and the trap filling efficiency. The latter relation can be utilized to select new efficient 5d-4f based afterglow phosphors. 2 Center for Nano-and Biophotonics (NB-Photonics), Ghent University, Belgium.

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“…Results reported in the literature showed that SrAl 2 [4], have a wide range of emission colors. Potential applications of these new phosphors are numerous, especially in the areas of safety improvement and energy saving (e.g., traffic signs, emergency signs, safety clothes, advertising, etc.…”

Section: Introductionmentioning

confidence: 99%

Intrinsic Defects in Strontium Aluminates studied via Computer Simulation Technique

Rezende

Araujo

Valério

et al. 2010

J. Phys.: Conf. Ser.

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Abstract. We present the results of computer simulation studies for all 10 different crystalline phases of the strontium aluminate family. After deriving a reliable potential model that reproduces all structures, the energetic process involving in creation of intrinsic defects were calculated, namely the Schottky, pseudo-Schottky, anti-Schottky, and Frenkel defects. The results indicated that the entire family of strontium aluminates can be divided in three groups according to the type of the predominant intrinsic defect formed, SrO pseudo-Schottky defect, oxygen Frenkel defect or Strontium Frenkel defect.

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Cited by 248 publications

References 2 publications

Understanding Persistent Luminescence: Rare-Earth- and Eu²⁺-doped Sr₂MgSi₂O₇

Understanding Persistent Luminescence: Rare-Earth- and Eu²⁺-doped Sr₂MgSi₂O₇

Temperature and wavelength dependent trap filling in M2Si5N8:Eu (M=Ca, Sr, Ba) persistent phosphors

Intrinsic Defects in Strontium Aluminates studied via Computer Simulation Technique

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Untitled

Cited by 248 publications

References 2 publications

Understanding Persistent Luminescence: Rare-Earth- and Eu2+-doped Sr2MgSi2O7

Understanding Persistent Luminescence: Rare-Earth- and Eu2+-doped Sr2MgSi2O7

Temperature and wavelength dependent trap filling in M2Si5N8:Eu (M=Ca, Sr, Ba) persistent phosphors

Intrinsic Defects in Strontium Aluminates studied via Computer Simulation Technique

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Understanding Persistent Luminescence: Rare-Earth- and Eu²⁺-doped Sr₂MgSi₂O₇

Understanding Persistent Luminescence: Rare-Earth- and Eu²⁺-doped Sr₂MgSi₂O₇