fabrication of luminescent perovskite quantum dots, conferring them additional
physicochemical stability, a pertinent issue in the development of perovskites. A
facile two-step synthesis procedure for the fabrication of luminescent and colortunable CsPbX 3 -zeolite FAUY composite phosphors was recently shown, where
perovskites quantum dots were encapsulated within the porous zeolite matrix
[122, 123]. The use of such phosphors was also demonstrated in the fabrication of
white-light-emitting diodes (WLEDs), with composite materials reaching luminescence quantum efficiencies of 81% [124]. The perovskite-zeolite composites
displayed a significant improved resistance to elevated temperatures, water, and
intensive laser illumination as compared to bare luminescent perovskite
quantum dots.
6 Concluding Remarks
Several aspects related to the synthesis, characterization, and potential applications
of luminescent metal clusters (particularly the case of highly luminescent silver
clusters) confined in zeolite matrices were addressed in this chapter. Due to the
recent advances in the intricate host-guest chemistry of zeolites, it has been possible
to design and synthesize functional metal clusters with specific size, geometry, and
charge within their porous framework. For the case of silver-zeolite composites, this
development has resulted in the fabrication of a wide palette of emitting clusters
spanning the whole visible spectrum displaying high external quantum efficiencies
(close to 100%), great chemical and photostability, and responsive optical properties. Altogether, these useful optical properties could be applied for the development
of smart sensing devices and more efficient (and cost-effective) phosphors for down
conversion in lighting applications. Though to date, the relationship between the
electronic and structural properties of such metal nanostructures has not been fully
understood. This is mainly due to the challenges associated with the characterization
of such clusters at the nanoscale. To overcome this problem, complementary and
holistic approaches have been developed and applied to understand the different
phenomena that govern the electronic and optical properties of luminescent silver
clusters confined in zeolites at the atomic scale. Ultimately, the deep understanding
obtained will allow the development of rational design rules for confining silver and
other metal clusters in zeolites. There is still a long way to go to arrive at a clear
image of how the electronic and structural features of silver clusters stabilized in
zeolites influence their optical properties; however, innovative studies have recently
paved the way to achieve such goals. Finally, it is expected that the scientific
community will get inspired by the approach followed to confine luminescence
metal clusters in zeolites which will ultimately trigger the development of related
nanostructured materials, such as the case of luminescent perovskite quantum dots
stabilized in zeolites, for which the first examples have been recently reported.
Highly Luminescent Metal Clusters Confined in Zeolites
99
physicochemical stability, a pertinent issue in the development of perovskites. A
facile two-step synthesis procedure for the fabrication of luminescent and colortunable CsPbX 3 -zeolite FAUY composite phosphors was recently shown, where
perovskites quantum dots were encapsulated within the porous zeolite matrix
[122, 123]. The use of such phosphors was also demonstrated in the fabrication of
white-light-emitting diodes (WLEDs), with composite materials reaching luminescence quantum efficiencies of 81% [124]. The perovskite-zeolite composites
displayed a significant improved resistance to elevated temperatures, water, and
intensive laser illumination as compared to bare luminescent perovskite
quantum dots.
6 Concluding Remarks
Several aspects related to the synthesis, characterization, and potential applications
of luminescent metal clusters (particularly the case of highly luminescent silver
clusters) confined in zeolite matrices were addressed in this chapter. Due to the
recent advances in the intricate host-guest chemistry of zeolites, it has been possible
to design and synthesize functional metal clusters with specific size, geometry, and
charge within their porous framework. For the case of silver-zeolite composites, this
development has resulted in the fabrication of a wide palette of emitting clusters
spanning the whole visible spectrum displaying high external quantum efficiencies
(close to 100%), great chemical and photostability, and responsive optical properties. Altogether, these useful optical properties could be applied for the development
of smart sensing devices and more efficient (and cost-effective) phosphors for down
conversion in lighting applications. Though to date, the relationship between the
electronic and structural properties of such metal nanostructures has not been fully
understood. This is mainly due to the challenges associated with the characterization
of such clusters at the nanoscale. To overcome this problem, complementary and
holistic approaches have been developed and applied to understand the different
phenomena that govern the electronic and optical properties of luminescent silver
clusters confined in zeolites at the atomic scale. Ultimately, the deep understanding
obtained will allow the development of rational design rules for confining silver and
other metal clusters in zeolites. There is still a long way to go to arrive at a clear
image of how the electronic and structural features of silver clusters stabilized in
zeolites influence their optical properties; however, innovative studies have recently
paved the way to achieve such goals. Finally, it is expected that the scientific
community will get inspired by the approach followed to confine luminescence
metal clusters in zeolites which will ultimately trigger the development of related
nanostructured materials, such as the case of luminescent perovskite quantum dots
stabilized in zeolites, for which the first examples have been recently reported.
Highly Luminescent Metal Clusters Confined in Zeolites
99