Template‐basierte Herstellung von 2D‐photonischen Superkristallen mit verstärkter spontaner Emission aus CsPbBr<sub>3</sub>‐Perowskit‐Nanokristallen

Vila‐Liarte, David; Feil, Maximilian W.; Manzi, Aurora; Garcia‐Pomar, Juan Luis; Huang, He; Döblinger, Markus; Liz‐Marzán, Luis M.; Feldmann, Jochen; Polavarapu, Lakshminarayana; Mihi, Agustín

doi:10.1002/ange.202006152

Cited by 6 publications

(2 citation statements)

References 52 publications

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“…By the magnetp-PL characterization, this ultra-low 2PA threshold can be partly attributed to the intermediate extended states among the bandgap, which opens a new venue to the high-efficiency photon energy upconversion. David and coworkers [102] fabricated elaborate 2D photonic supercrystals consisting of perovskite QDs. The photonic crystal arrangement couples the incident light to the NC layer and increases the electric field intensity effectively, thereby achieve a two-photon ASE under low optical excitation fluences.…”

Section: Pamentioning

confidence: 99%

Advances of Nonlinear Photonics in Low‐Dimensional Halide Perovskites

Wang

Mei

Liao

et al. 2021

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Hybrid halide perovskites emerging as a highly promising class of functional materials for semiconductor optoelectronic applications have drawn great attention from worldwide researchers. In the past few years, prominent nonlinear optical properties have been demonstrated in perovskite bulk structures indicating their bright prospect in the field of nonlinear optics (NLO). Following the surge of 3D perovskites, more recently, the low‐dimensional perovskites (LDPs) materials ranging from two‐, one‐, to zero‐dimension such as quantum‐wells or colloidal nanostructures have displayed unexpectedly attractive NLO response due to the strong quantum confinement, remarkable exciton effect, and structural diversity. In this perspective, the current state of the art is reviewed in the field of NLO for LDP materials. The relationship between confinement effect and NLO is analyzed systematically to give a comprehensive understanding of the function of dimension reduction. Furthermore, future directions and challenges toward the improvement of the NLO in LDP materials are discussed to provide an outlook in this rapidly developing field.

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Section: Pamentioning

confidence: 99%

Advances of Nonlinear Photonics in Low‐Dimensional Halide Perovskites

Wang

Mei

Liao

et al. 2021

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“…Laser tests on these CDs used a 355 or 532 nm pulsed laser, a repetition rate of 10 Hz, and a laser spot area of 0.005546 cm 2 . Increasing the pump fluence induced amplified spontaneous emission (ASE) behavior [ 41 ] in the solution of R‐CDs but not in the solution of G‐CDs, Y‐CDs, and B‐CDs( Figure a–d). The deep red emission was significantly amplified compared with that from the Y‐CDs and B‐CDs in solution, again confirming the excellent gain ability of the R‐CDs under laser pumping.…”

Section: Resultsmentioning

confidence: 99%

Acid‐Triggered Aggregation of Carbon Dots Shifted Their Emission to Give Unexpected Deep‐Red Lasing

Tang

Song

et al. 2023

Adv Funct Materials

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It is challenging to realize ultra‐pH‐responsive fluorescent carbon dots (CDs), especially reversibly adjustable multichromatic emission covering a broad wavelength range including deep‐red lasing. This study reports a one‐step solvothermal treatment of pyrogallol to obtain brilliant CDs with a substantial bathochromic shift (from blue to dark red emission) induced by pH changes. The CDs show an excellent reversible pH response: simple acid treatment instantaneously shifts their initial green emission by 140 nm to a deep‐red emission with high‐color‐purity and enhances brightness, subsequent alkali addition returned the green emission, suggesting smooth and reversible regulation of fluorescence. Detailed components analyses, morphology tracking, and photodynamic studies demonstrate the discrete, reversible shift of emission derived from structural transformations, which include protonation of the CDs and their subsequent assembly and partial aggregation triggered by hydrogen bonding. The abundant H‐bonds crosslink the network of CDs, ultimately raising the quantum yield from 11.3% to 16.0%. Furthermore, the aggregated CDs crystallized into sheet‐like structures that acted as a resonant cavity for lasing show excellent gain ability and lead to strong deep‐red lasing. This study draws together pH regulation, the effects of CD's assembly, and their lasing emission to demonstrate significant potential for the development of versatile CDs.

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Enhanced Photoluminescence of Cesium Lead Halide Perovskites by Quasi‐3D Photonic Crystals

Carreño

Passarelli

Otero

et al. 2021

Advanced Optical Materials

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relatively cheap, extremely lightweight and compact, and are pretty rugged with a long usable life span. Besides, these solid-state sources generate less heat and require less power compared with more traditional light sources. Among these new materials, cesium lead halide (CsPbX 3 ) perovskite nanocrystals (NCs) are excellent candidates for emerging optoelectronic devices [1][2][3][4] due to their low cost, scalable synthesis, high photoluminescence (PL) quantum yield, and tunability along all the visible range varying their composition and size. [3,[5][6][7] Inorganic perovskite NCs present narrow emission bands and good stability to environmental conditions. Moreover, these NCs are pretty versatile, and they can be embedded within organic and inorganic matrices, such as polymethyl methacrylate, [7] or silica [8] for improved stability. [4] In order to harness and control the emission from the cesium lead halide (CsPbX 3 ) nanocrystals, they are often accompanied by a light managing scheme that enhances the PL [9,10] or provides emission directionality. [11] It is also possible to directly shape the perovskite NCs themselves into photonic architectures such as thin films, [12] 2D gratings, [13] microdisks, [14] nanowires, [15,16] 3D photonic crystals, [17,18] or l micro hemispheres, [19] among others. Even though this material is suitable for many optoelectronic devices, its toxicity and instability against oxidation and humidity limit their potential into potentially commercial applications. The encapsulation of these NCs into transparent oxides has proved to be a solution to improve their photonic stability as well as to reduce the metal halide toxicity, leaving the luminescent properties reasonably unmodified. Different strategies of encapsulation have been recently reported, such as the in situ growth of the NCs within the precursor glass by thermal treatment, [20] the incorporation of perovskite thin layers or powder heating the transparent oxide above glass its transition [21] or by femtosecond laser-assisted crystallization induced by a nonlinear localized network glass destruction and giving chance to perovskite crystallization. [22] Many optoelectronic devices feature light-trapping schemes that improve their performance by facilitating the light absorption in the active layer (as in solar cells and photodetectors) or provide pathways to enhance the light emission from light sources. Among the different strategies employed, diffraction Cesium lead halide perovskite nanocrystals have emerged as one of the most promising candidates for manufacturing portable lasers and light sources. In order to harness and exploit their photoluminescence more effectively, the nanocrystals are often accompanied by a photonic scheme that improves light emission. In this work, a quasi-3D photonic crystal is introduced which is composed of a 2D-grating on top of a distributed Bragg reflector (DBR) and provides a greater photoluminescence enhancement than the isolated architectures alone. The quasi-3D photonic crystals suppo...

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Template‐basierte Herstellung von 2D‐photonischen Superkristallen mit verstärkter spontaner Emission aus CsPbBr₃‐Perowskit‐Nanokristallen

Cited by 6 publications

References 52 publications

Advances of Nonlinear Photonics in Low‐Dimensional Halide Perovskites

Advances of Nonlinear Photonics in Low‐Dimensional Halide Perovskites

Acid‐Triggered Aggregation of Carbon Dots Shifted Their Emission to Give Unexpected Deep‐Red Lasing

Enhanced Photoluminescence of Cesium Lead Halide Perovskites by Quasi‐3D Photonic Crystals

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Template‐basierte Herstellung von 2D‐photonischen Superkristallen mit verstärkter spontaner Emission aus CsPbBr3‐Perowskit‐Nanokristallen

Cited by 6 publications

References 52 publications

Advances of Nonlinear Photonics in Low‐Dimensional Halide Perovskites

Advances of Nonlinear Photonics in Low‐Dimensional Halide Perovskites

Acid‐Triggered Aggregation of Carbon Dots Shifted Their Emission to Give Unexpected Deep‐Red Lasing

Enhanced Photoluminescence of Cesium Lead Halide Perovskites by Quasi‐3D Photonic Crystals

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Template‐basierte Herstellung von 2D‐photonischen Superkristallen mit verstärkter spontaner Emission aus CsPbBr₃‐Perowskit‐Nanokristallen