Some New Classes of Efficient Eu2+ -Activated Phosphors

Blasse, G.; Wanmaker, W. L.; Vrugt, J. W. ter

doi:10.1149/1.2411388

Cited by 104 publications

(112 citation statements)

References 5 publications

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“…2) consists of a single broad green emission band. Its peak position (λ max = 521 nm) and bandwidth (FWHM = 80 nm) are in line with literature reports [24,25]. This emission is characteristic for 5d-4f transitions in divalent europium.…”

Section: A Photoluminescence Of Sral 2 O 4 :Eudysupporting

confidence: 90%

Trapping and detrapping inSrAl2O4:Eu,Dypersistent phosphors: Influence of excitation wavelength and temperature

2014

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SrAl 2 O 4 :Eu,Dy is presumably the best known persistent luminescent phosphor. At room temperature, its green emission remains visible for hours after switching off the excitation. It is known that upon lowering the temperature of the phosphor a second photoluminescence emission band arises in the blue part of the visible spectrum, although its origin is still the subject of discussion. In this paper we thoroughly study the origin of both emission bands in SrAl 2 O 4 :Eu,Dy and we attribute this to europium ions substituting for the two different Sr sites in the phosphor's monoclinic host lattice. The photoluminescence properties, the thermal quenching behavior, and photoluminescence lifetime of both emission bands are investigated. A lanthanide energy level scheme is constructed for both sites. Using an integrated approach, i.e., combining charging, afterglow, and thermoluminescence measurements in the same run, we study the charging or trap filling processes in SrAl 2 O 4 :Eu,Dy upon excitation with site selective excitation wavelengths and at different temperatures. We show that trap filling is a thermally activated process when the green emitting center is excited at 435 nm.Furthermore, we also demonstrate that the distribution of filled traps after charging depends strongly on the excitation wavelength and thus on which Eu 2+ center has been excited. This suggests trapping of the electron close to the ionized Eu 2+ ion, without full delocalization to the conduction band during the trapping process. Finally, the quantum efficiency of the persistent luminescence is estimated at 65 (+/−10)%.

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Section: A Photoluminescence Of Sral 2 O 4 :Eudysupporting

confidence: 90%

Trapping and detrapping inSrAl2O4:Eu,Dypersistent phosphors: Influence of excitation wavelength and temperature

2014

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“…On the contrary, for the position of the Eu 2+ emission band in Sr 2 MgSi 2 O 7 and Ba 2 MgSi 2 O 7 the opposite effect is expected. The reasons for this behavior are not clear as noted already previously [64].…”

Section: Persistent Luminescencementioning

confidence: 64%

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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“…However, it has problems of low color stability with increasing applied current, low color rendering index, and low color reproducibility [5,6]. Another new type of phosphor-Sr 2 SiO 4 :Eu 2+ has attracted researchers' attention [7][8][9]. Sr 2 SiO 4 provides the broadband absorption in UV/Blue region due to low symmetry of the crystallographic sites.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Optical properties of Eu3+ doped Sr2SiO4 Phosphor for Solid State lighting applications

B¹,

Z²,

H³

2017

IOSR JAP

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Some New Classes of Efficient Eu2+ -Activated Phosphors

Abstract: not Available.

Cited by 104 publications

References 5 publications

Trapping and detrapping inSrAl2O4:Eu,Dypersistent phosphors: Influence of excitation wavelength and temperature

Trapping and detrapping inSrAl2O4:Eu,Dypersistent phosphors: Influence of excitation wavelength and temperature

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

Synthesis and Optical properties of Eu3+ doped Sr2SiO4 Phosphor for Solid State lighting applications

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Some New Classes of Efficient Eu2+ -Activated Phosphors

Abstract: not Available.

Cited by 104 publications

References 5 publications

Trapping and detrapping inSrAl2O4:Eu,Dypersistent phosphors: Influence of excitation wavelength and temperature

Trapping and detrapping inSrAl2O4:Eu,Dypersistent phosphors: Influence of excitation wavelength and temperature

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

Synthesis and Optical properties of Eu3+ doped Sr2SiO4 Phosphor for Solid State lighting applications

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