Emulsion Synthesis of Size-Tunable CH3NH3PbBr3 Quantum Dots: An Alternative Route toward Efficient Light-Emitting Diodes

Huang, Hailong; Zhao, Fangchao; Liu, Lige; Zhang, Feng; Wu, Xian‐gang; Shi, Lei; Zou, B. S.; Pei, Qibing; Zhong, Haizheng

doi:10.1021/acsami.5b10373

Cited by 437 publications

(375 citation statements)

References 28 publications

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“…This superior characterization is similar as the shelling of ZnS around CdSe QDs core, photoexcitated carriers would be confined, and a high PL quantum efficiency could be expected. For a further confirmation, Zhong and coworkers performed the energy-dispersive spectroscopy measurements for synthesized MAPbBr 3 QDs [20]. They found a Br/Pb ratio of 3:5 for QDs with an average diameter of 3.3 nm, matching with the observation in Li's report.…”

Section: Synthesis Of Mapbx 3 Qdssupporting

confidence: 65%

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Perovskite Quantum Dot Light-Emitting Diodes

Shi¹,

Li²,

Shan³

2017

Quantum-Dot Based Light-Emitting Diodes

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Recently, lead halide perovskite quantum dots (QDs) have attracted much attention because of their excellent properties of high color purity, tunable emission wavelength covering the whole visible region, and ultrahigh photoluminescence (PL) quantum yield. They are expected to be promising candidates for the next-generation cost-effective lighting and display sources. Here, we introduced the recent development in the direct solutionprocessed synthesis and ion exchange-based reactions, leading to organic/ inorganic hybrid halide perovskites (CH 3 NH 3 PbX 3 ; X = Cl, Br, I) and all-inorganic lead halide perovskites (CsPbX 3 ; X = Cl, Br, I), and studied their optical properties related to exciton-related emission and quantum confinement effect. Finally, we reviewed the recent progresses on the perovskite light-emitting diodes (LEDs) based on CH 3 NH 3 PbX 3 and CsPbX 3 quantum dots and provided a critical outlook into the existing and future challenges.

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Section: Synthesis Of Mapbx 3 Qdssupporting

confidence: 65%

“…For instance, Huang et al reported the emulsion-based synthesis of perovskite nanocrystals involving many morphologies at RT [20]. Li et al reported that the CsPbX 3 QDs can be synthesized at RT, which was similar to the ligand-assisted reprecipitation method used for MAPbX 3 QD system [19].…”

Section: Synthesis Of Cspbx 3 Qdsmentioning

confidence: 99%

Perovskite Quantum Dot Light-Emitting Diodes

Shi¹,

Li²,

Shan³

2017

Quantum-Dot Based Light-Emitting Diodes

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“…Methods such as emulsion synthesis 49 and electrospray technique coupled antisolvent − solvent extraction 50 have been used for the synthesis of perovskite NCs of different morphologies, mostly yielding rather polydisperse nanoparticles. It has been shown that nearly Colloidal lead halide perovskite nanocrystals H Huang et al monodisperse blue-emitting nanoplatelets and green-emitting nanorods can be prepared in 1-octadecene at high temperature.…”

Section: Synthesis Of Perovskite Ncsmentioning

confidence: 99%

“…For instance, Huang et al 49 reported the emulsion-based synthesis of perovskite NCs (both hybrid and all-inorganic) at room temperature. In a recent report Li et al 64 Figure 5 showed that CsPbX 3 NCs can be synthesized at room temperature, similar to the LARP method used for the MAPbX 3 system.…”

Section: (Figures 4f-h) the Initially Formed Cubic Ncs Transformed Intomentioning

confidence: 99%

Colloidal lead halide perovskite nanocrystals: synthesis, optical properties and applications

et al. 2016

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Lead halide perovskite nanocrystals (NCs) are receiving a lot of attention nowadays, due to their exceptionally high photoluminescence quantum yields reaching almost 100% and tunability of their optical band gap over the entire visible spectral range by modifying composition or dimensionality/size. We review recent developments in the direct synthesis and ion exchange-based reactions, leading to hybrid organic-inorganic (CH 3 NH 3 PbX 3 ) and all-inorganic (CsPbX 3 ) lead halide (X = Cl, Br, I) perovskite NCs, and consider their optical properties related to quantum confinement effects, single emission spectroscopy and lasing. We summarize recent developments on perovskite NCs employed as an active material in several applications such as light-emitting devices, solar cells and photodetectors, and provide a critical outlook into the existing and future challenges.

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“…Early demonstrations of perovskite LED (PeLED) using polycrystalline films suffer from low external quantum efficiency (EQE) due to nonideal PLQY of the bulk halide perovskites, while PNCs present potential alternatives toward efficient and bright light-emitting devices. [52][53][54][55][56][57] …”

Section: Introductionmentioning

confidence: 99%

In Situ Fabricated Perovskite Nanocrystals: A Revolution in Optical Materials

Chang

Bai

Zhong

2018

Advanced Optical Materials

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190

127

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in bulk halide perovskites, long carrier diffusion length, and an absorption range covering the visible solar spectrum, collectively enable the high performance of photo electricity conversion. Compared to the bulk materials, perovskite nanocrystals or quantum dots (usually denoted as PNCs or PQDs) show obvious excitonic features with enhanced photoluminescence (PL) properties due to the well-known size-dependent quantum confinement effects. [14][15][16][17] The combination of color saturated emissions, super high quantum yield (QY), as well as easy processing inspired the intensive exploration of PNCs as light emitters, which is now under spotlights in the field of optical materials.The first perspective aim of PNCs is to alternate the state-of-the-art CdSe or InP quantum dots (QDs) as new generation luminescence materials. [18,19] As shown in Figure 1, these QD materials have been well demonstrated to be potential functional components for photonic and optoelectronic applications, and are currently on the way to industrialization. [20][21][22][23] Specifically, QDs can be employed as fluorescence labels, [24] laser gain media, [25] LED phosphors, [26] and down-shifting films for LCD backlights. [27,28] They can also be processed into thin film for optoelectronic devices including solar cells, [29] photodetectors, [30,31] transistors [32] and LEDs. [33] The PNCs outcompete these conventional QDs in terms of narrower full width at half maximum (FWHM) and low fabrication cost, but most importantly, the ease of in situ preparation. [34,35] Herein, this progress report highlight the developments of in situ fabricated PNCs.Colloidal semiconductor QDs are typically synthesized ex situ in flasks by hot injection method, stabilized by surface ligands. [36][37][38][39] To incorporate such solution based materials into applications usually requires purification, redispersion and surface engineering. For instance, ligand exchange is often employed to disperse QDs into aimed solvent, inducing defects that inevitably derogating the PLQYs. [40] Moreover, the organic ligands themselves also suffer from the risk of disabsorbing, reducing the stability of the QDs and thus the final devices. [41] Because halide perovskite are ionic compounds that can be well dissolved into polar solvents, PNCs can be fabricated through either ex situ routes in flask or in situ strategies on substrates. The in situ fabricated PNCs are adaptable to devices integration due to their scalable and low-cost manufacturing. In this regard, more and more efforts have been made in terms of the controlling synthesis, physical properties and device applications of PNC materials.After over 30 years of development, colloidal quantum dots have now become mature luminescent materials in photonic and optoelectronic operations and start to hit the market. The emerging perovskite nanocrystals are expected to promote large-scale commercialization due to their superior optical properties as well as low cost and easy fabrication. This progress report is focused on the...

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Emulsion Synthesis of Size-Tunable CH₃NH₃PbBr₃ Quantum Dots: An Alternative Route toward Efficient Light-Emitting Diodes

Cited by 437 publications

References 28 publications

Perovskite Quantum Dot Light-Emitting Diodes

Perovskite Quantum Dot Light-Emitting Diodes

Colloidal lead halide perovskite nanocrystals: synthesis, optical properties and applications

In Situ Fabricated Perovskite Nanocrystals: A Revolution in Optical Materials

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