In Situ Observation of the Emission Characteristics of Zeolite‐Hosted Silver Species During Heat Treatment

Abstract

The influence of heat treatment on the evolution of luminescence in silver exchanged zeolites is investigated under controlled atmosphere by using in situ fluorescence microscopy (see figure). The results indicate that the stable yellow Ag3n+ emitter is most efficiently created in a dry zeolite Y host. In zeolite A, the clusters interact with neighboring clusters or with water, decreasing the overall yellow luminescence.

Silver-induced reconstruction of an adeninate-based metal–organic framework for encapsulation of luminescent adenine-stabilized silver clusters

“…Our proposed luminescent system is more stable over time, as the silver clusters are contained by adenine in the pores of the MOF-69A framework, much like silver clusters in zeolites. 20,22,23 In zeolites A and Y, the smallest reported emissive clusters, most probably Ag 3 + , also display the most blue-shifted emission. Based on these analogies, we propose that the blue-green luminescent adenine-stabilized clusters formed in MOF-69A are no larger than four silver atoms.…”

Tuning the energetics and tailoring the optical properties of silver clusters confined in zeolites

“…Both contain sodalite cages, but differ in the secondary building units interconnecting these cages. Luminescent Ag 3 n+ clusters are the most frequently reported in FAU frameworks, [18][19][20][21][22] whilst both Ag 3 n+ and Ag 6 n+ clusters are frequently identified in LTA frameworks. 22,23 There are limited reports of other clusters forming, including Ag 4 n+ in LTA frameworks 15 and Ag 2 n+ , Ag 4 n+ and Ag 8 n+ in FAU frameworks.…”

Supramolecular Organization in Confined Nanospaces

“…Nowadays, silver‐containing zeolites can be synthesized with tailored optical properties: they can emit in the whole visible spectrum and with remarkable quantum efficiencies . Zeolite‐Y works particularly well, because the luminescent clusters are hosted in well‐separated hexagonal prism cages ,. In zeolite A, the clusters are located in adjacent sodalite cages (Figure ), yet they still feature excellent stability and efficiency .…”

“…Zeolite‐Y works particularly well, because the luminescent clusters are hosted in well‐separated hexagonal prism cages ,. In zeolite A, the clusters are located in adjacent sodalite cages (Figure ), yet they still feature excellent stability and efficiency . By this virtue, silver exchanged LTA zeolites hold great promise for practical applications such as optical encoders or bright emitters in OLEDs .…”