Time-resolved photoluminescence analysis of distribution and migration of terbium ions in zeolites X

Tiseanu, Carmen; Frunză, Ligia; Kumke, Michael U.

doi:10.1016/j.physb.2004.08.015

Cited by 8 publications

(4 citation statements)

References 36 publications

(47 reference statements)

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“…This is a concentration-dependent process and therefore may provide information on the clustering effects. 28 Further, the energy gap between the metastable state and the ground-state manifold is larger than that of Eu 3+ (at ca. 15 000 cm -1 ).…”

Section: Introductionmentioning

confidence: 92%

“…On the contrary, the ion blue emission ( 5 D 3 − 7 F 6 ) is generally subject to a strong quenching via cross relaxation . This is a concentration-dependent process and therefore may provide information on the clustering effects . Further, the energy gap between the metastable state and the ground-state manifold is larger than that of Eu 3+ (at ca.…”

Section: Introductionmentioning

confidence: 99%

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Photoluminescence Response of Terbium-Exchanged MFI-Type Materials to Si/Al Ratio, Texture, and Hydration State

et al. 2006

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Terbium-exchanged MFI zeolite type materials, i.e., microporous-mesoporous Zeotile-1 with the Si/Al ratio in the range 33-200, Zeogrid with the Si/Al ratio of 75, and nanocrystalline MFI with the Si/Al ratio of 75, were prepared via an ion exchange procedure. All of these zeolites were investigated by means of time-resolved photoluminescence techniques in various hydration states: as-synthesized (hydrated), calcined (heated at 450 degrees C in air), and rehydrated (after a six-month exposure to the atmospheric moisture). The photoluminescence decays and spectra were analyzed by discrete exponential fitting, distribution lifetimes analysis, and area-normalized time-resolved photoluminescence spectra. The results sustained a single average terbium species coordinated to both water molecules and framework oxygens in the hydrated zeolites. The framework contribution increased with the Si/Al ratio in Zeotile-1 and was greatest for the nanocrystalline MFI zeolite. For the calcined Zeotile-1 and Zeogrid, two main terbium species of different environments were found. For the nanocrystalline Tb3+-MFI, a distinct number of species could not be inferred, indicating a more heterogeneous distribution. Rehydration further differentiated among the Tb3+-exchanged zeolites. Photoluminescence line shape and decay of Tb3+-Zeotile-1 were between those of the hydrated and calcined states indicating a slow rehydration rate in contrast with the photoluminescence properties of Tb3+-MFI, which fully recovered the values of the hydrated state. Tb3+-Zeogrid presented an intermediate case: while the PL line shape was fully restored to that measured for the hydrated sample, the decay was still longer than that measured with the hydrated sample. Terbium photoluminescence response related to zeolite texture, Si/Al ratio, and hydration state suggest different sitting and location of terbium in Zeotile-1, Zeogrid, and nanocrystalline MFI materials. In mesoporous Zeotile-1 and Zeogrid, the results sustained two types of terbium sites: one on the internal surface of mesopores, the other inside the pores, while for the nanocrystalline MFI, terbium sites inside the pores predominate.

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Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Photoluminescence Response of Terbium-Exchanged MFI-Type Materials to Si/Al Ratio, Texture, and Hydration State

et al. 2006

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“…In zeolite A with different Si/Al ratios, the Tb 3+ ions migrate from the supercage to the sodalite cages at 100 °C . Two different species could be detected for hydrated Tb 3+ ions in the supercage of Tb 3+ -exchanged zeolite X . Tiseanu et al investigated the dehydration and rehydration of different Tb 3+ -exchanged zeolites of the ZSM-5 type (MFI type) by luminescence spectroscopy. , The local order of the Tb 3+ ions and the behavior toward rehydration were found to be dependent on the type of zeolite host.…”

Section: Porous Hybrid Materialsmentioning

confidence: 99%

Lanthanide-Based Luminescent Hybrid Materials

2009

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Koen Binnemans was born in Geel, Belgium, in 1970. He obtained his M. Sc. degree (1992) and Ph.D. degree (1996) in Chemistry at the Catholic University of Leuven, under the supervision of Prof. C. Go ¨rller-Walrand. In the period 1999-2005, he was a postdoctoral fellow of the Fund for Scientific Research Flanders (Belgium). He did postdoctoral work with Prof. Jacques Lucas (Rennes, France) and Prof. Duncan W. Bruce (Exeter, U.K.). In 2000, he received the first ERES Junior Award (ERES, European Rare-Earth and Actinide Society). From 2002 until 2005, he was (parttime) associate professor. Presently, he is professor of chemistry at the Catholic University of Leuven. His current research interests are metalcontaining liquid crystals (metallomesogens), lanthanide-mediated organic reactions, lanthanide spectroscopy, luminescent molecular materials, and ionic liquids.

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“…A band attributed to the 7 F 6 ! 5 L 9 transition in Tb(III) ions is found at 350 nm [26]. There are also two sharp exciton bands at 215 and 230 nm.…”

Section: Resultsmentioning

confidence: 85%

Emission enhancement of Eu(III) and/or Tb(III) ions entrapped in silica xerogels with ZnO nanoparticles by energy transfer

Kłonkowski

Zalewska

Kościelska

2006

Journal of Non-Crystalline Solids

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Time-resolved photoluminescence analysis of distribution and migration of terbium ions in zeolites X

Cited by 8 publications

References 36 publications

Photoluminescence Response of Terbium-Exchanged MFI-Type Materials to Si/Al Ratio, Texture, and Hydration State

Photoluminescence Response of Terbium-Exchanged MFI-Type Materials to Si/Al Ratio, Texture, and Hydration State

Lanthanide-Based Luminescent Hybrid Materials

Emission enhancement of Eu(III) and/or Tb(III) ions entrapped in silica xerogels with ZnO nanoparticles by energy transfer

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