balancing ions in the zeolite framework) present in non-irradiated samples. Very
high writing resolutions, down to the diffraction limit, were obtained as well as an
excellent readability due to the positive contrast imaging and brightness stability of
the emissive clusters. By using this strategy, several advanced matrix codes were
generated in different layers of individual zeolite microcarriers demonstrating an
excellent 3D resolution. Therefore, these materials open new opportunities for builtin safety and quality labels to prevent counterfeiting, for instance, in bank notes.
Moreover, this strategy has also been extended to other confinement hosts (using
silver clusters as guests) such as polymers and glass matrices [117–119] and at
different photoactivation scales (Fig. 9, lower panel).
5 Other Luminescent Metal Clusters and Perovskite
Quantum Dots Confined in Zeolites
The ship-in-a-bottle strategy to confine luminescent silver clusters in zeolites has
been extended to other metal precursors, such as the case of lead clusters. In a recent
study, the self-assembly and confinement of highly luminescent lead (Pb) clusters
into the molecular-sized cavities of LTA zeolites was demonstrated [120].
Fig. 8 Schematic representation of a silver-zeolite composite-based LED (ZEOLED). Taken from
Ref. [70]. Copyright 2017 Wiley-VCH GmbH & Co. KGaA, Weinheim
Highly Luminescent Metal Clusters Confined in Zeolites
97
high writing resolutions, down to the diffraction limit, were obtained as well as an
excellent readability due to the positive contrast imaging and brightness stability of
the emissive clusters. By using this strategy, several advanced matrix codes were
generated in different layers of individual zeolite microcarriers demonstrating an
excellent 3D resolution. Therefore, these materials open new opportunities for builtin safety and quality labels to prevent counterfeiting, for instance, in bank notes.
Moreover, this strategy has also been extended to other confinement hosts (using
silver clusters as guests) such as polymers and glass matrices [117–119] and at
different photoactivation scales (Fig. 9, lower panel).
5 Other Luminescent Metal Clusters and Perovskite
Quantum Dots Confined in Zeolites
The ship-in-a-bottle strategy to confine luminescent silver clusters in zeolites has
been extended to other metal precursors, such as the case of lead clusters. In a recent
study, the self-assembly and confinement of highly luminescent lead (Pb) clusters
into the molecular-sized cavities of LTA zeolites was demonstrated [120].
Fig. 8 Schematic representation of a silver-zeolite composite-based LED (ZEOLED). Taken from
Ref. [70]. Copyright 2017 Wiley-VCH GmbH & Co. KGaA, Weinheim
Highly Luminescent Metal Clusters Confined in Zeolites
97