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Journal ArticleDOI: 10.1021/ACSPHOTONICS.1C00118

In Situ Patterning Perovskite Quantum Dots by Direct Laser Writing Fabrication

04 Mar 2021-ACS Photonics (American Chemical Society (ACS))-Vol. 8, Iss: 3, pp 765-770
Abstract: Perovskite quantum dots have been attractive building blocks for novel photonic devices development, where patterning is usually one of the most critical steps. We report on the combination of in s...

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Topics: Perovskite (structure) (55%), Quantum dot (54%)

5 results found

Journal ArticleDOI: 10.1039/D1CP02119B
Ke Xing1, Sheng Cao1, Xi Yuan2, Ruosheng Zeng1  +3 moreInstitutions (2)
Abstract: Inorganic lead halide perovskite (ILHP) nanocrystals (NCs) show great potential in solid state lighting and next generation display technology due to their excellent optical properties. However, almost all ILHP NCs are still facing the problem of unstable luminescence properties caused by heating and/or UV illumination. Further improving the thermal and photo stability of ILHP NCs has become the most urgent challenge for their practical application. This Perspective review specifically focuses on the thermal and photo stability of ILHP NCs, discusses and analyzes the factors that affect the thermal and photo stability of ILHP NCs from the perspective of surface ligands and structure composition, summarizes the current strategies to improve the thermal and photo stability of ILHP NCs, and presents the key challenges and perspectives on the research for the improvement of thermal and photo stability of ILHP NCs.

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3 Citations

Journal ArticleDOI: 10.1039/D1QM00513H
Min Zhang1, Lili Meng1, Huanhuan Deng1, Huan Liu1Institutions (1)
Abstract: Solution processes have been widely used in controllable patterning of zero-dimensional nanoparticles on certain substrates due to their advantages of mild conditions, low-cost fabrication and good device compatibility. Preparing high-quality micro-patterns is very important for realizing high-performance devices. However, the solution processes normally involve both the coffee ring effect and Marangoni flow caused by solvent evaporation, which make it hard for precisely patterning nanoparticles in a controllable manner, leading to nonuniform micro-patterns. Therefore, various approaches have been developed to solve the adverse effects of the coffee ring during the film-forming process. In this contribution, we have reviewed the recent progress in controllable patterning of nanoparticles using solution transfer approaches either by taking advantage of or by inhibiting the coffee ring effect, as well as the mechanism involved and the applications in various fields.

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Topics: Coffee ring effect (55%)

1 Citations

Journal ArticleDOI: 10.1016/J.JNONCRYSOL.2021.121022
Ke Wei1, Panpan Li1, Yongmin Duan1, Shuqin Zhang1  +3 moreInstitutions (1)
Abstract: Available tunability of energy up-conversion in rare-earth (RE) ion doped nanomaterials has drawn great attention recently in the field of high-sensitive optical temperature transducer, but the intrinsically sharp fluorescence thermal-quenching and low energy transfer efficiency certainly limit further development. In this work, CsPbBr3 perovskite quantum dots (PQDs) was prepared by the melt-quenching method, simultaneously doping with Dy3+ in borosilicate glass, aiming to explore the thermochromic property. The novel phenomenon herein is that emerged bimodal emissions come from a luminescent active center of CsPbBr3 and a temperature-passivated RE Dy3+ ion, synergistically contributed to the remarkable relative sensitivities (2.631% K − 1). Interestingly, temperature-depended polychromatic luminescence among the PQDs embedded glass has been fully demonstrated as pumped by 365 nm ultraviolet light. Precise control of luminescent centers and color gamut is expected to design a temperature-sensitive material based on PQDs for promising optical applications.

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Topics: Ultraviolet light (54%), Luminescence (51%)

Journal ArticleDOI: 10.1016/J.MTNANO.2021.100142
Shu Wang1, Zuyao Zhou1, Zuyao Zhou2, Bai-zhong Li1  +3 moreInstitutions (3)
Abstract: Laser direct writing (LDW) system is a maskless, highly efficient, and cost-effective micro-/nanofabrication tool and has been widely used in many fabrication fields such as Micro-Electro-Mechanical System (MEMS), photomask, various micro-/nanostructures, and so forth. With rapid development of nanotechnologies, LDW system with higher fabrication resolution and more application scenarios has been evoking interest. In recent years, New-Generation LDW (New-Ge LDW) system has been developed for meeting requirements mentioned above and has already provided many opportunities to explore new micro-/nanofabrication technologies. The New-Ge LDW system improves fabrication resolution based on a new working principle of laser-matter non-linear interaction, which is quite different from traditional LDW that is limited to Rayleigh's criterion. The new principle brings two technical breakthroughs: (1) exceeding limitation of diffraction limit (Rayleigh's criterion) realizing nanoscale fabrication; (2) breaking through limitation of single acceptor material (organic photoresist) enabling any material to be as resist materials such as metals, semiconductors, organic materials, and so forth, thus greatly expanding usage scenarios of the New-Ge LDW. Many works have exhibited that the New-Ge LDW has tremendous potential in fabrication of various nanodevices and nanostructures for different material systems. It is necessary and urgent to review the New-Ge LDW from principle to equipment and to technological methods and latest applications.

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Journal ArticleDOI: 10.1021/ACS.NANOLETT.1C02249
22 Sep 2021-Nano Letters
Abstract: Microscale patterning of solution-processed nanomaterials is important for integration in functional devices. Colloidal lead halide perovskite (LHP) nanocrystals (NCs) can be particularly challenging to pattern due to their incompatibility with polar solvents and lability of surface ligands. Here, we introduce a direct photopatterning approach for LHP NCs through the binding and subsequent cleavage of a photosensitive oxime sulfonate ester (-C═N-OSOO-). The photosensitizer binds to the NCs through its sulfonate group and is cleaved at the N-O bond during photoirradiation with 405 nm light. This bond cleavage decreases the solubility of the NCs, which allows patterns to emerge upon development with toluene. Postpatterning ligand exchange results in photoluminescence quantum yields of up to 79%, while anion exchange provides tunability in the emission wavelength. The patterned NC films show photoconductive behavior, demonstrating that good electrical contact between the NCs can be established.

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Topics: Bond cleavage (52%)

45 results found

Open accessJournal ArticleDOI: 10.1021/NL5048779
02 Feb 2015-Nano Letters
Abstract: Metal halides perovskites, such as hybrid organic–inorganic CH3NH3PbI3, are newcomer optoelectronic materials that have attracted enormous attention as solution-deposited absorbing layers in solar cells with power conversion efficiencies reaching 20%. Herein we demonstrate a new avenue for halide perovskites by designing highly luminescent perovskite-based colloidal quantum dot materials. We have synthesized monodisperse colloidal nanocubes (4–15 nm edge lengths) of fully inorganic cesium lead halide perovskites (CsPbX3, X = Cl, Br, and I or mixed halide systems Cl/Br and Br/I) using inexpensive commercial precursors. Through compositional modulations and quantum size-effects, the bandgap energies and emission spectra are readily tunable over the entire visible spectral region of 410–700 nm. The photoluminescence of CsPbX3 nanocrystals is characterized by narrow emission line-widths of 12–42 nm, wide color gamut covering up to 140% of the NTSC color standard, high quantum yields of up to 90%, and radiativ...

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Topics: Quantum dot (53%), Photoluminescence (51%), Halide (51%) ... read more

4,445 Citations

Journal ArticleDOI: 10.1002/ADMA.201502567
Jizhong Song1, Jianhai Li1, Xiaoming Li1, Leimeng Xu1  +2 moreInstitutions (1)
01 Nov 2015-Advanced Materials
Abstract: Novel quantum-dot light-emitting diodes based on all-inorganic perovskite CsPbX3 (X = Cl, Br, I) nanocrystals are reported. The well-dispersed, single-crystal quantum dots (QDs) exhibit high quantum yields, and tunable light emission wavelength. The demonstration of these novel perovskite QDs opens a new avenue toward designing optoelectronic devices, such as displays, photodetectors, solar cells, and lasers.

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Topics: Quantum dot (57%), Perovskite (structure) (57%), Light emission (56%) ... read more

1,829 Citations

Journal ArticleDOI: 10.1021/ACSNANO.5B01154
Feng Zhang1, Haizheng Zhong1, Cheng Chen2, Xian-gang Wu1  +5 moreInstitutions (2)
01 Apr 2015-ACS Nano
Abstract: Organometal halide perovskites are inexpensive materials with desirable characteristics of color-tunable and narrow-band emissions for lighting and display technology, but they suffer from low photoluminescence quantum yields at low excitation fluencies. Here we developed a ligand-assisted reprecipitation strategy to fabricate brightly luminescent and color-tunable colloidal CH3NH3PbX3 (X = Br, I, Cl) quantum dots with absolute quantum yield up to 70% at room temperature and low excitation fluencies. To illustrate the photoluminescence enhancements in these quantum dots, we conducted comprehensive composition and surface characterizations and determined the time- and temperature-dependent photoluminescence spectra. Comparisons between small-sized CH3NH3PbBr3 quantum dots (average diameter 3.3 nm) and corresponding micrometer-sized bulk particles (2–8 μm) suggest that the intense increased photoluminescence quantum yield originates from the increase of exciton binding energy due to size reduction as well a...

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Topics: Quantum dot (61%), Photoluminescence (57%), Quantum yield (55%)

1,505 Citations

Journal ArticleDOI: 10.1021/JA0173167
Z. Adam Peng1, Xiaogang Peng1Institutions (1)
Abstract: The nucleation and growth of colloidal CdSe nanocrystals with a variety of elongated shapes were explored in detail. The critical size nuclei for the system were magic sized nanoclusters, which possessed a sharp and dominated absorption peak at 349 nm. The formation of the unique magic sized nuclei in a broad monomer concentration range was not expected by the classic nucleation theory. We propose that this was a result of the extremely high chemical potential environment, that is, very high monomer concentrations in the solution, required for the growth of those elongated nanocrystals. The shape, size, and size/shape distributions of the resulting nanocrystals were all determined by two related factors, the magic sized nuclei and the concentration of the remaining monomers after the initial nucleation stage. Without any size sorting, nearly monodisperse CdSe quantum structures with different shapes were reproducibly synthesized by using the alternative cadmium precursors, cadmium-phosphonic acid complexe...

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Topics: Nucleation (60%), Nanoclusters (52%), Crystal growth (51%)

1,388 Citations

Open accessJournal ArticleDOI: 10.1038/NPHOTON.2016.62
01 May 2016-Nature Photonics
Abstract: The prospects for light-emitting diodes and lasers based on perovskite materials are reviewed. The field of solution-processed semiconductors has made great strides; however, it has yet to enable electrically driven lasers. To achieve this goal, improved materials are required that combine efficient (>50% quantum yield) radiative recombination under high injection, large and balanced charge-carrier mobilities in excess of 10 cm2 V−1 s−1, free-carrier densities greater than 1017 cm−3 and gain coefficients exceeding 104 cm−1. Solid-state perovskites are — in addition to galvanizing the field of solar electricity — showing great promise in photonic sources, and may be the answer to realizing solution-cast laser diodes. Here, we discuss the properties of perovskites that benefit light emission, review recent progress in perovskite electroluminescent diodes and optically pumped lasers, and examine the remaining challenges in achieving continuous-wave and electrically driven lasing.

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Topics: Semiconductor laser theory (53%), Light emission (53%), Spontaneous emission (51%) ... read more

1,031 Citations

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