Photonic Tuning of the Emission Color of Nanophosphor Films Processed at High Temperature

Geng, Dongling; Lozano, Gabriel; Calvo, Mauricio E.; Núñez, Nuria O.; Becerro, Ana Isabel; Ocaña, Manuel; Míguez, Hernán

doi:10.1002/adom.201700099

Cited by 23 publications

(25 citation statements)

References 51 publications

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Section: Applicationsmentioning

confidence: 99%

“…Concerning inorganic mesoporous structures, the need for severe thermal annealing forbids the introduction of polymer and organic dyes in the microcavity layers, and only permits their infiltration within the porosity of the entire structure . As an example, europium emitters have been included into in SiO 2 :SnO MCs, and nanophosphors have been embedded between two ZrO 2 :SiO 2 DBRs . Regarding the implementation of active polymers and organic molecules in mesoporous microcavity, some hybrid structures have been demonstrated to be compatible with temperature sensitive media.…”

Section: Applicationsmentioning

confidence: 99%

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Advances in Functional Solution Processed Planar 1D Photonic Crystals

Lova

Manfredi

Comoretto

2018

Advanced Optical Materials

170

226

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photonic states (PDOS), [2][3][4] which helps explaining the photoluminescence (PL) changes of materials when embedded in the PhC structure.Traditionally, PhCs have been made carving bulky inorganic dielectrics or sem iconductors. These structures are still a hot topic in photonics for optical fibers, light emitting diodes (LEDs), sensors, photo voltaic devices, lasers, discrete and integrated optical components, lightening, and quantum computing. [6] However, new solution processable photoactive materials (e.g., organic semiconductors, quantum dots, hybrid perovskites, and selfassem bling supramolecular systems) stimulated the development of PhCs grown with organic and colloidal materials by solution and melt processes. [7] Among PhCs, distributed Bragg reflectors (DBRs) are cur rently the most interesting owing to their planar structure which generates a simple optical response that represents a playground to understand deep physical concepts, as described in Sections 2.4 and 4. DBRs are indeed made of alternated thin films of different dielectric materials. This simplicity makes them the only PhCs that can take advantage of large area growths (see Section 3.1). [8] Such fabrication methods are unconceivable with bulky inorganic DBRs and might reduce processing costs and enhance customizability, also on industrial scale, thus adding unprecedented market opportunities. Figure 1 illustrates the evolution and fabrications of solution and melt processed DBRs. The top of the Figure displays three wellknown natural DBRs belonging to animal and plant reigns: the mother of pearl, [9] the Panamanian Tortoise beetle exoskel eton, [10] and the Pollia Condensata skin, [11] whose growth is driven by the thermodynamics of spinodal phase separation. [12] The interest in these natural structures leads to their emulation until the development of solutionbased fabrication methods for flexible synthetic DBRs made of polymers and inorganic nanoparticles (Figure 1). At the base of Figure 1, we also show some applications arose only in the last decades. From left to right: the use of DBRs in functional architecture, in enhance ment of photon absorption for photovoltaic cells and modules, emission control, lasing, and sensing. [7c,13] In this paper we will first briefly review the properties of DBRs and then focus on the reasons that guided the research toward new solutionbased and largearea fabrications, describing current processes used both at the laboratory and largearea scales. We will then review the main applications of these structures comparing the performances of mesoporous inorganic and polymer devices. An overview on the properties and applications of polymer and inorganic planar 1D photonic crystals fabricated from solution is provided here. In the last decades, photonic crystals became technologically relevant for light management, photovoltaics, sensing, and lasing. Such structures are traditionally produced by lithographic and vacuum techniques, but the need to reduce costs and to scale-up the fabrication have lea...

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Section: Applicationsmentioning

confidence: 99%

Section: Applicationsmentioning

confidence: 99%

Advances in Functional Solution Processed Planar 1D Photonic Crystals

Lova

Manfredi

Comoretto

2018

Advanced Optical Materials

170

226

View full text Add to dashboard Cite

show abstract

“…Therefore, the 4°-grown sample is 24 nm thicker than the 40°-grown sample. Since the PL intensity is linearly depended on the film thickness [41][42][43], a small portion of this PL enhancement is due to the difference in the film thickness.…”

Section: Resultsmentioning

confidence: 99%

Experimental study of the size-dependent photoluminescence emission of CBD-grown PbSe nanocrystals on glass

Hemati

Weng

2020

Nano Ex.

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In this work, we study the size-dependent properties of Photoluminescence (PL) emissions of PbSe Nanocrystals (NCs) grown by Chemical Bath Deposition (CBD) method. In previous studies, PL emissions have been tuned by CBD-grown PbSe, and the growth mechanism was dependent on crystalized substrates such as GaAs. In this research, however, PL emissions are controlled over the midinfrared (MIR) range, through PbSe NCs, which are deposited on glass as an amorphous material. This study proposes an alternative approach to control PL emissions, which provides us with more freedom to fabricate low-cost MIR light sources as crucial components in remote sensing and gas analysis. Moreover, in this study, the advantage of the post-thermal method to control the NCs size, compared to the growth temperature, is shown.

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“…In this work, we demonstrate a novel way to mould the colour purity and angular distribution of the photoemission of nanophosphors following an approach based on photonic tuning, rather than on customary chemical management, which has been recently proven to yield luminescent coatings with tuneable emission 32. Herein, we show that a thin layer of RE nanocrystals can behave as a directional source of light with high colour purity.…”

mentioning

confidence: 97%

“…In order to shape them as a uniform film of optical quality ( i.e. , transparent) that can be incorporated into a photonic structure, we make use of our previous experience with the integration of GdVO 4 :Dy 3+ nanophosphors by solution processing, which could be cast into well-defined visible transparent emitting films via spin coating 32. In this case, we could successfully prepare transparent GdVO 4 :Eu 3+ nanophosphor films by dip coating, which allows even finer control over the thickness than spin-coating.…”

mentioning

confidence: 99%