Thermoluminescence and synchrotron radiation studies on the persistent luminescence of BaAl2O4:Eu2+,Dy3+

Rodrigues, Lucas Carvalho Veloso; Stefani, Roberval; Brito, Hermi F.; Felinto, Maria Claudia França da Cunha; Hölsä, Jorma; Lastusaari, Mika; Laamanen, Taneli; Malkamäki, Marja

doi:10.1016/j.jssc.2010.07.044

Cited by 54 publications

(25 citation statements)

References 34 publications

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“…The precursors were dissolved into the smallest possible amount of distilled water. A silica capsule filled with the homogeneous solution was inserted into a furnace pre-heated at 500 °C [16,[18][19][20]. The reaction began after ca.…”

Section: Materials Preparationmentioning

confidence: 99%

“…The analysis of their structure can help the understanding of the effect of the co-dopants in the persistent luminescence of Eu 2+ doped materials, too. Furthermore, the reduction mechanism of Eu 3+ to Eu 2+ without the use of reducing atmosphere proposed for the BaAl 2 O 4 material [16] involves the release of '' i O . Therefore, the reduced stability of '' i O may be related to this spontaneous reduction, and further studies with other hosts should be carried out.…”

Section: Trap Nature and Structurementioning

confidence: 99%

“…In this work, the persistent luminescence mechanisms for Eu 2+ (in BaAl 2 O 4 ) [1,16] and Tb 3+ (in CdSiO 3 ) [5] are discussed. Both mechanisms were developed based on the experimental results derived from photoluminescence, synchrotron radiation (SR) UV-VUV spectroscopy and thermoluminescence measurements.…”

Section: Introductionmentioning

confidence: 99%

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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: Materials Preparationmentioning

confidence: 99%

Section: Trap Nature and Structurementioning

confidence: 99%

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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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“…Thus, the luminescence arising from refractive materials is of particularly interest due to the unique mechanical properties [3] and good chemical and thermal stability of these materials [4]. This kind of materials have been widely studied since their optical properties are strongly correlated to the structural effects and could be related to a variety of different types of photophysical phenomena [5,6]. The persistent luminescence materials are inserted in this context with a wide variety of applications, such as emergency lighting [7] and even medical diagnostics [8,9].…”

Section: Introductionmentioning

confidence: 99%

Influence of titanium and lutetium on the persistent luminescence of ZrO_2

Carvalho¹,

Rodrigues²,

Hölsä³

et al. 2012

Opt. Mater. Express

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Non-doped as well as titanium and lutetium doped zirconia (ZrO 2 ) materials were synthesized via the sol-gel method and structurally characterized with X-ray powder diffraction. The addition of Ti in the zirconia lattice does not change the crystalline structure whilst the Lu doping introduces a small fraction of the tetragonal phase. The UV excitation results in a bright white-blue luminescence at ca. 500 nm for all the materials which emission could be assigned to the Ti 3+ e g  t 2g transition. The persistent luminescence originates from the same Ti 3+ center. The thermoluminescence data shows a well-defined though rather similar defect structures for all the zirconia materials. The kinetics of persistent luminescence was probed with the isothermal decay curve analyses which indicated significant retrapping. The short duration of persistent luminescence was attributed to the quasi-continuum distribution of the traps and to the possibility of shallow traps even below the room temperature. 1076-1078 (2000). 13. R. C. Garvie, R. H. Hannink, and R. T. Pascoe, "Ceramics steel," Nature 258(5537), 703-704 (1975)

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“…The doping elements used in the study are known to have different effects: Eu 2 þ is a well known activator of the optical properties of the pigment while Dy 3 þ is a phosphorescent decay extender [3,7,8]. As has been previously described [9][10][11][12], the XRD results (Fig. 2) indicate that the crystalline phase formed for all samples was hexagonal barium aluminate (BaAl 2 O 4 -JCPDS 00-017-0306).…”

Section: Pigmentsmentioning

confidence: 70%