Photophysical Properties of Metal Ion Functionalized NaY Zeolite

Abstract

A series of luminescent ion exchanged zeolite are synthesized by introducing various ions into NaY zeolite. Monometal ion (Eu(3+), Tb(3+), Ce(3+), Y(3+), Zn(2+), Cd(2+), Cu(2+)) exchanged zeolite, rare-earth ion (Eu(3+), Tb(3+), Ce(3+)) exchanged zeolite modified with Y(3+) and rare-earth ion (Eu(3+), Tb(3+), Ce(3+)) exchanged zeolite modified with Zn(2+) are discussed here. The resulting materials are characterized by Fourier transform infrared spectrum radiometer (FTIR), XRD, scanning electronic microscope (SEM), PLE, PL and luminescence lifetime measurements. The photoluminescence spectrum of NaY indicates that emission band of host matrix exhibits a blueshift of about 70 nm after monometal ion exchange process. The results show that transition metal ion exchanged zeolites possess a similar emission band due to dominant host luminescence. A variety of luminescence phenomenon of rare-earth ion broadens the application of zeolite as a luminescent host. The Eu(3+) ion exchanged zeolite shows white light luminescence with a great application value and Ce(3+) exchanged zeolite steadily exhibits its characteristic luminescence in ultraviolet region no matter in monometal ion exchanged zeolite or bimetal ions exchanged zeolite.

Interaction between the exchanged Mn2+ and Yb3+ ions confined in zeolite-Y and their luminescence behaviours

“…And the number and sites of the cations strongly affect the properties of the zeolites. Among all kinds of zeolites, zeolite-Y shows the faujasite (FAU) structure, whose pore diameter is about 7.4 Å as the aperture is defined by a 12-member oxygen ring resulting in a larger cavity diameter of 12 Å1.…”

Encapsulating Photoluminescent Materials in Zeolites. II. Crystal Structure of Fully Dehydrated Ce21H46O18–Y (Si/Al = 1.69) Containing Ce4O44+, CeOH2+, Ce3+, and H+

“…It is due to the 4f 0 5d 1 → 4f 1 5d 0 transition in Ce 3+ . This transition is from the excited state, 2 D 3/2 , to either the 2 F 7/2 state or the 2 F 5/2 ground state; these cannot be distinguished directly . Although the dehydration of the powder caused many water molecules bound to Ce 3+ to be lost, the emission peak position at 347 nm is almost the same as it was in hydrated Ce,Na–Y, 350 nm. , Suib and Tanguay suggested that most dehydrated rare earth exchanged zeolites show extremely broadened emission spectra because of the loss of water molecules and the movement of Ce 3+ ions into the sodalite cavities …”

“…36 Although the dehydration of the powder caused many water molecules bound to Ce 3+ to be lost, the emission peak position at 347 nm is almost the same as it was in hydrated Ce,Na−Y, 350 nm. 36,37 Suib and Tanguay suggested that most dehydrated rare earth exchanged zeolites show extremely broadened emission spectra because of the loss of water molecules and the movement of Ce 3+ ions into the sodalite cavities. 37 The luminescence results may not be directly related to the structure reported because the powder (Si/Al ca.…”

“…Kynast and co-workers also reported that the photoluminescence properties in the UV and green spectral emission ranges of zeolite X doped with both Ce 3+ and Tb 3+ were dependent on the Ce 3+ concentration and the Ce 3+ /Tb 3+ ratio . Yan et al studied the luminescent properties of Ce 3+ -exchanged zeolite Na–Y and reported that it exhibits its characteristic luminescence in the ultraviolet region in Ce,Na–Y, Ce,Y,Na–Y, Ce,Y,Tb,Na–Y, Ce,Zn,Na–Y, and Ce,Zn,Na–Y . The luminescence of the rare earth ions in zeolites has been reviewed …”

“…35 Yan et al studied the luminescent properties of Ce 3+exchanged zeolite Na−Y and reported that it exhibits its characteristic luminescence in the ultraviolet region in Ce,Na− Y, Ce,Y,Na−Y, Ce,Y,Tb,Na−Y, Ce,Zn,Na−Y, and Ce,Zn,Na− Y. 36 The luminescence of the rare earth ions in zeolites has been reviewed. 37 1.5.…”