Luminescence properties of Cu+ in zeolites. In situ study of thin layers

Calzaferri, Gion; Giovanoli, R.; Kamber, I.; Shklover, Valery; Nesper, Reinhard

doi:10.1163/156856793x00514

Cited by 12 publications

(13 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This can be used to investigate their influence on the luminescence quenching of the encapsulated HR. Experiments were carried out at room temperature for K + ‐exchanged samples in an apparatus described41 which allows us to monitor the pressure and hence the vapor pressure of water. The effect is that the luminescence of the sample is strongly increased and blue‐shifted upon evacuation, as seen in Figure 9 (top).…”

Section: Resultsmentioning

confidence: 99%

“…Low-pressure measurements: The emission was measured at low pressure by using a high-vacuum chamber described in reference [41] by using an Alcatel turbomolecular vacuum pump, model Drytel 1025. The acquisition of the spectra was carried out on a system consisting of a Nd:YAG pulsed laser (Quantel Brilliant) and an OPO (Opotek MagicPrism Vibrant Vis), which was pumped by the third harmonic.…”

Section: Spectroscopic Measurementsmentioning

confidence: 99%

See 1 more Smart Citation

Proton Activity Inside the Channels of Zeolite L

Albuquerque

Calzaferri

2007

Chemistry A European J

View full text Add to dashboard Cite

The proton activity inside the channels of zeolite L has been studied by investigating dye-loaded zeolite L crystals under different conditions, such as water content, nature of the counterions, and nature of the solvent. The discussion is made within the frame of three types of dye-loaded zeolite L systems, classified according to their ability to exchange matter (dyes, cations, solvent, and other small molecules) with the environment. The classification refers to dye-loaded zeolites. The term "closed" and "semi-open" characterize different possibilities of the channels to exchange small molecules, cations, and solvent molecules with the environment, but not dyes. The "open" systems also allow for dye exchange. UV-visible and fluorescence spectroscopy have been used to observe the proton activity inside the zeolite L channels. The influence of the proton activity on the luminescence of encapsulated dyes is discussed, special attention being given to luminescence quenching by excited-state protonation. Partially proton-exchanged zeolite L can be a superacid, whereas for the M-exchanged form (M: K(+), Li(+), Cs(+), Mg(2+), Ca(2+)) the pH ranges from about 2.5 to 3.5. For these last forms, the differences in pH are due to the acid-base reactions of the respective metal cations with water inside the zeolite. Finally, we describe an easy experimental procedure that can be used to tune the proton activity inside the zeolite L to a considerable extent.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Spectroscopic Measurementsmentioning

confidence: 99%

Proton Activity Inside the Channels of Zeolite L

Albuquerque

Calzaferri

2007

Chemistry A European J

View full text Add to dashboard Cite

show abstract

“…This strain increases with increasing exchange level until the framework ruptures. 26 This problem can be avoided by ion exchange of Cu + in liquid ammonia 21 or by insertion of CuCl from the gas phase. 27 In this case nearly a total exchange has been obtained without destroying the zeolite framework.…”

Section: Preparation Of D 10 -Zeolite Materialsmentioning

confidence: 99%

The electronic structure of Cu⁺, Ag⁺, and Au⁺zeolites

et al. 2003

View full text Add to dashboard Cite

A variety of procedures have been used to prepare d10-zeolite materials. The electronic structure of these materials can be regarded to a first approximation as a superposition of the framework, of the charge compensating ions, of solvent molecules and of guest species. Zeolite oxygen to d10-ion charge transfer transitions dominate the electronic spectra if the ions coordinate to the zeolite oxygens. Specific coordination sites can influence the energy and the intensity of these transitions remarkably. Intra guest transitions dominate in quantum dot materials, as discussed in detail for luminescent Ag2S zeolite A. The zeolite is not needed for the photocatalytic water oxidation on Ag+/AgCl photo anodes with visible light. It can, however, be used to increase the active surface area substantially.

show abstract

“…Microporous zeolites are one of the most important materials used in industry for catalysis, adsorption, and ion exchange [1][2][3][4]. The use of this type of materials is expanding, and attempts have been made on many aspects of their applications [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. Studies on the trapping of electrons by charge-balancing cation clusters and by guest species in the zeolite cavities has been active in recent years due to interest in the confinement of zeolite cavities, metal-to-insulator transitions [8,9,14].…”

Section: Introductionmentioning

confidence: 99%

“…Studies on the trapping of electrons by charge-balancing cation clusters and by guest species in the zeolite cavities has been active in recent years due to interest in the confinement of zeolite cavities, metal-to-insulator transitions [8,9,14]. charge transfer and stabilization [5,18], solar energy conversion [6], and base-catalyzed reactions [7].…”

Section: Introductionmentioning

confidence: 99%

Photoinduced reactions in zeolites: kinetic motion, environment, and charge stabilization

Thomas

2002

International Journal of Photoenergy

View full text Add to dashboard Cite

Photophysical and photochemical methods are used to examine the interior surfaces of zeolite X and Y. These methods are also used to examine the effect of co-adsorbed solvent molecules on photo-induced processes in these zeolites. In particular, the effect of solvent on the diffusive motion in and between the zeolite cages is illustrated. Finally, the unique charge trapping and charge stabilization of the zeolite is shown.

show abstract

Luminescence properties of Cu+ in zeolites. In situ study of thin layers

Cited by 12 publications

References 49 publications

Proton Activity Inside the Channels of Zeolite L

Proton Activity Inside the Channels of Zeolite L

The electronic structure of Cu⁺, Ag⁺, and Au⁺zeolites

Photoinduced reactions in zeolites: kinetic motion, environment, and charge stabilization

Contact Info

Product

Resources

About

Luminescence properties of Cu+ in zeolites. In situ study of thin layers

Cited by 12 publications

References 49 publications

Proton Activity Inside the Channels of Zeolite L

Proton Activity Inside the Channels of Zeolite L

The electronic structure of Cu+, Ag+, and Au+zeolites

Photoinduced reactions in zeolites: kinetic motion, environment, and charge stabilization

Contact Info

Product

Resources

About

The electronic structure of Cu⁺, Ag⁺, and Au⁺zeolites