Centimeter‐Sized Cs4PbBr6 Crystals with Embedded CsPbBr3 Nanocrystals Showing Superior Photoluminescence: Nonstoichiometry Induced Transformation and Light‐Emitting Applications

Chen, Xiaomei; Zhang, Feng; Ge, Yong; Shi, Ling‐Feng; Huang, Sheng; Tang, Jui-Hsiang; Zhao, Ling; Zhang, Li; Zou, B. S.; Zhong, Haizheng

doi:10.1002/adfm.201706567

Cited by 264 publications

(364 citation statements)

References 47 publications

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“…102 Blue-emitting Cs 4 PbBr 6 composites were only very recently reported by Chen et al, who were able to synthesize both blue- and green-emerging Cs 4 PbBr 6 cm-sized single crystals embedded with CsPbBr 3 NCs. 34 Here, it was observed that during the crystallization first small blue-emitting NCs were formed. Interestingly, it was reported the blue PL slowly shifted toward the green, even if the single crystals were isolated from their growth media, thus indicating that small blue-emitting CsPbBr 3 NCs are thermodynamically less stable than the larger green-emitting CsPbBr 3 NCs.…”

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confidence: 95%

“…38 Moreover, several groups have used transmission electron microscopy (TEM) to identify the presence of green luminescent CsPbBr 3 NCs in Cs 4 PbBr 6 microcrystals, as well as in Cs 4 PbBr 6 NC solutions (Figure 2e). 30,31,34,62 …”

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confidence: 99%

“…Interestingly, it was reported the blue PL slowly shifted toward the green, even if the single crystals were isolated from their growth media, thus indicating that small blue-emitting CsPbBr 3 NCs are thermodynamically less stable than the larger green-emitting CsPbBr 3 NCs. Although it was speculated that the CsPbBr 3 NCs were formed due to Pb 2+ vacancies, 34 a deep study of the formation and growth of these embedded CsPbBr 3 NCs is still lacking.…”

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Zero-Dimensional Cesium Lead Halides: History, Properties, and Challenges

Akkerman

Abdelhady

Manna

2018

J. Phys. Chem. Lett.

231

247

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Over the past decade, lead halide perovskites (LHPs) have emerged as new promising materials in the fields of photovoltaics and light emission due to their facile syntheses and exciting optical properties. The enthusiasm generated by LHPs has inspired research in perovskite-related materials, including the so-called “zero-dimensional cesium lead halides”, which will be the focus of this Perspective. The structure of these materials is formed of disconnected lead halide octahedra that are stabilized by cesium ions. Their optical properties are dominated by optical transitions that are localized within the individual octahedra, hence the title “‘zero-dimensional perovskites”. Controversial results on their physical properties have recently been reported, and the true nature of their photoluminescence is still unclear. In this Perspective, we will take a close look at these materials, both as nanocrystals and as bulk crystals/thin films, discuss the contrasting opinions on their properties, propose potential applications, and provide an outlook on future experiments.

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Zero-Dimensional Cesium Lead Halides: History, Properties, and Challenges

Akkerman

Abdelhady

Manna

2018

J. Phys. Chem. Lett.

231

247

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“…[120] Very recently, we developed a HBr-assisted slow cooling method to fabricate Cs 4 PbBr 6 single crystallites with embedded CsPbBr 3 NCs. [121] as depicted in Figure 8a,b. PbBr 2 and CsBr with molar ratio of 1:4 was dissolved in a fixed mixture of DMF and HBr (Volume ratio 5:4).…”

Section: In Situ Fabricated Pncs Embedded In Crystalline Matrixmentioning

confidence: 99%

“…Reproduced with permission. [17,51,53,59,67,78,88] Copyright 2014-2017, American Chemical Society; [57] Copyright 2015, American Association for the Advancement of Science; [58] Copyright 2012, The Chemical Society of Japan; [63,65] Copyright 2016, Springer Nature; [62,[70][71][72]117,121] Copyright 2015-2018, Wiley-VCH. mesostructured films through sol-gel treatment of TiO 2 and SiO 2 precursors within organic templating agents.…”

Section: Hard Template Assisted In Situ Fabricationmentioning

confidence: 99%

In Situ Fabricated Perovskite Nanocrystals: A Revolution in Optical Materials

Chang

Bai

Zhong

2018

Advanced Optical Materials

Self Cite

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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Synthesis of 0D Manganese‐Based Organic–Inorganic Hybrid Perovskite and Its Application in Lead‐Free Red Light‐Emitting Diode

Yan

Tian

Chen

et al. 2021

Adv Funct Materials

122

104

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Lead‐based perovskite light‐emitting diodes (PeLEDs) have exhibited excellent purity, high efficiency, and good brightness. In order to develop nontoxic, highly luminescent metal halide perovskite materials, tin, copper, germanium, zinc, bismuth, and other lead‐free perovskites have been developed. Here, a novel 0D manganese‐based (Mn‐based) organic–inorganic hybrid perovskite with the red emission located at 629 nm, high photoluminescence quantum yield of 80%, and millisecond level triplet lifetime is reported. When applied as the emissive layer in the PeLEDs, the maximum recording brightness of devices after optimization is 4700 cd m−2, and the peak external quantum efficiency is 9.8%. The half‐life of the device reaches 5.5 h at 5 V. The performance and stability of Mn‐based PeLEDs are one order of magnitude higher than those of other lead‐free PeLEDs. This work clearly shows that the Mn‐based perovskite will provide another route to fabricate stable and high‐performance lead‐free PeLEDs.

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Centimeter‐Sized Cs₄PbBr₆ Crystals with Embedded CsPbBr₃ Nanocrystals Showing Superior Photoluminescence: Nonstoichiometry Induced Transformation and Light‐Emitting Applications

Cited by 264 publications

References 47 publications

Zero-Dimensional Cesium Lead Halides: History, Properties, and Challenges

Zero-Dimensional Cesium Lead Halides: History, Properties, and Challenges

In Situ Fabricated Perovskite Nanocrystals: A Revolution in Optical Materials

Synthesis of 0D Manganese‐Based Organic–Inorganic Hybrid Perovskite and Its Application in Lead‐Free Red Light‐Emitting Diode

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