Eu2+ doped calcium aluminates prepared by alternative low temperature routes

Aitasalo, T.; Hölsä, Jorma; Jungner, H.; Lastusaari, Mika; Niittykoski, Janne; Parkkinen, Marjukka; Valtonen, R.

doi:10.1016/j.optmat.2003.11.007

Cited by 72 publications

(33 citation statements)

References 22 publications

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“…6,51,52 The host material has a monoclinic crystal structure, 53 but when prepared with a combustion or sol-gel method, a hexagonal or orthorhombic phase is sometimes obtained. 54,55 The monoclinic structure has three possible cation sites, but the Eu 2+ ions, which are somewhat larger than the Ca 2+ ions, are only incorporated in the more spacious trigonal antiprism site. 56 The presence of only a single europium site simplifies the analysis of the luminescence data (as compared to, e.g.. SrAl 2 O 4 :Eu which has two possible europium sites 56 ).…”

Section: Trap Depth Distribution In Caal 2 O 4 :Eundmentioning

confidence: 99%

Revealing trap depth distributions in persistent phosphors

et al. 2013

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Persistent luminescence or afterglow is caused by a gradual release of charge carriers from trapping centers. The energy needed to release these charge carriers is determined by the trap depths. Knowledge of these trap depths is therefore crucial in the understanding of the persistent luminescence mechanism. Unfortunately, the trap depths in persistent phosphors are often difficult to evaluate in an accurate and reliable way. The existing analysis methods are mostly based on single experiments, or they ignore the possibility of a continuous distribution of trap depths. We present a procedure to accurately probe the activation energies, even in the presence of a continuous distribution of energy levels. By performing a series of thermoluminescence experiments with varying excitation duration and at varying excitation temperature, and employing the initial rise analysis method, the depth and shape of such a distribution can be estimated. As an example, we investigated the trap system in the violet persistent phosphor CaAl 2 O 4 :Eu,Nd, and show that it consists of a Gaussian-shaped distribution of trap depths. The maximal density of traps lies in the region around 0.9 eV, but the distribution extends to 0.7 eV on the shallow side and 1.2 eV on the deep side. The described procedure can be used to obtain a clear view of the trap system in other persistent phosphors as well. This can lead to a better understanding of the nature of these trapping centers, and the role they play in the persistent luminescent mechanism.

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Section: Trap Depth Distribution In Caal 2 O 4 :Eundmentioning

confidence: 99%

Revealing trap depth distributions in persistent phosphors

et al. 2013

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“…With the development of scientific technologies on materials, several chemical synthesis techniques, such as co-precipitation [3], sol-gel [4][5][6], microwave [7], Pechini [8] and combustion [9][10][11] synthesis methods have been applied to prepare rare earth ions activation alkaline earth aluminate and/or its phosphors. All of these methods were conducted in liquid phases so that each component can be accurately controlled and uniformly mixed.…”

Section: Introductionmentioning

confidence: 99%

Operation by Eu luminescence in CaAl2O4:Eu2+ alloys by Zn substitution

Ryu

Bartwal

2008

Journal of Alloys and Compounds

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“…[19] In , and there is the energy level interval (ET) between the energy levels and the excited state energy level. When the material is excited, some of the Eu 2+ excitation electrons are stored in the trap energy level through the relaxation process.…”

Section: +mentioning

confidence: 99%

Synthesis of the long‐persistence phosphor CaAl₂O₄:Eu²⁺, Dy³⁺, Nd³⁺ by combustion method and its luminescent properties

2009

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Calcium aluminate phosphor co-doped Eu(2+), Dy(3+), Nd(3+) is prepared by the combustion method. We study systemically the influences of the quantity of mixed Dy(3+) ion, the quantity of flux H(3)BO(3), the differences in dispersing methods between magnetic stirring and ultrasonic dispersing and the combustion temperature on the long-persistence phosphor. The analytical results indicate that Dy(3+) ion improves the properties of the phosphors CaAl(2)O(4):Eu(2+), Nd(3+). The appropriate quantity of flux H(3)BO(3 )to( )reduce the forming temperature of the sample was determined. The monoclinic single phase of CaAl(2)O(4) formed at 500 degrees C and remained steady. The calcium aluminate co-doped Eu(2+), Dy(3+), Nd(3+) was synthesized by dispersal of the raw material using the ultrasonic method, and it had better optical properties.

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Eu2+ doped calcium aluminates prepared by alternative low temperature routes

Cited by 72 publications

References 22 publications

Revealing trap depth distributions in persistent phosphors

Revealing trap depth distributions in persistent phosphors

Operation by Eu luminescence in CaAl2O4:Eu2+ alloys by Zn substitution

Synthesis of the long‐persistence phosphor CaAl₂O₄:Eu²⁺, Dy³⁺, Nd³⁺ by combustion method and its luminescent properties

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Eu2+ doped calcium aluminates prepared by alternative low temperature routes

Cited by 72 publications

References 22 publications

Revealing trap depth distributions in persistent phosphors

Revealing trap depth distributions in persistent phosphors

Operation by Eu luminescence in CaAl2O4:Eu2+ alloys by Zn substitution

Synthesis of the long‐persistence phosphor CaAl2O4:Eu2+, Dy3+, Nd3+ by combustion method and its luminescent properties

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Synthesis of the long‐persistence phosphor CaAl₂O₄:Eu²⁺, Dy³⁺, Nd³⁺ by combustion method and its luminescent properties