Lead-free Cesium Europium Halide Perovskite Nanocrystals

Huang, Jin‐Shun; Teng, Lirong; Siron, Martin; Zhang, Ye; Yu, Sunmoon; Seeler, Fabian; Dehestani, Ahmad; Quan, Li Na; Schierle‐Arndt, Kerstin; Yang, Peidong

doi:10.1021/acs.nanolett.0c00692

Cited by 122 publications

(153 citation statements)

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“…[ 180 ] Yang's group synthesized CsEuCl 3 nanocrystals with a blue emission at 435 nm and a narrow FWHM of 19 nm. [ 181 ] Among lead‐free halide perovskites, CsEuCl 3 possesses the narrowest FWHM, which shows some promise in display applications. The development of CsYbI 3 and CsEuCl 3 inspires new type lead‐free halide perovskite materials via rare‐earth substitutes.…”

Section: Structural and Optical Properties Of Lead‐free Halide Perovsmentioning

confidence: 99%

Lead‐Free Halide Perovskites for Light Emission: Recent Advances and Perspectives

Gao

Zhang³

et al. 2021

Advanced Science

191

178

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Lead‐based halide perovskites have received great attention in light‐emitting applications due to their excellent properties, including high photoluminescence quantum yield (PLQY), tunable emission wavelength, and facile solution preparation. In spite of excellent characteristics, the presence of toxic element lead directly obstructs their further commercial development. Hence, exploiting lead‐free halide perovskite materials with superior properties is urgent and necessary. In this review, the deep‐seated reasons that benefit light emission for halide perovskites, which help to develop lead‐free halide perovskites with excellent performance, are first emphasized. Recent advances in lead‐free halide perovskite materials (single crystals, thin films, and nanocrystals with different dimensionalities) from synthesis, crystal structures, optical and optoelectronic properties to applications are then systematically summarized. In particular, phosphor‐converted LEDs and electroluminescent LEDs using lead‐free halide perovskites are fully examined. Ultimately, based on current development of lead‐free halide perovskites, the future directions of lead‐free halide perovskites in terms of materials and light‐emitting devices are discussed.

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Section: Structural and Optical Properties Of Lead‐free Halide Perovsmentioning

confidence: 99%

Lead‐Free Halide Perovskites for Light Emission: Recent Advances and Perspectives

Gao

Zhang³

et al. 2021

Advanced Science

191

178

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“…Using this method, qualitative information about the presence of a specific element can be retrieved, along with its oxidation state, type of bond, and relative abundance compared to other elements (Figure 12E). 51,52,112,164 Seeing is believing, therefore the most reliable and direct method to assess the success in terms of doping is high-resolution transmission electron microscopy (HR-TEM -Figure 12F, G, H). Z-contrasti.e., contrast based on difference in the atomic number of the elements -might be useful in situations where the mass of the elements differs substantially, 48 but discrimination of few Ln 3+ ions per particle is hardly achieved without additional support.…”

Section: Structural and Compositional Characterizationmentioning

confidence: 99%

Doping Lanthanide Ions in Colloidal Semiconductor Nanocrystals for Brighter Photoluminescence

2020

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The spectrally narrow, long-lived luminescence of lanthanide ions makes optical nanomaterials based on these elements uniquely attractive from both a fundamental and applicative standpoint. A highly coveted class of such nanomaterials is represented by colloidal lanthanide-doped semiconductor nanocrystals (LnSNCs). Therein, upon proper design, the poor light absorption intrinsically featured by lanthanides is compensated by the semiconductor moiety, which harvests the optical energy and funnel it to the luminescent metal center. Although a great deal of experimental effort has been invested to produce efficient nanomaterials of that sort, relatively modest results have been obtained thus far. As of late, halide perovskite nanocrystals have surged as materials of choice for doping lanthanides, but they have non-negligible shortcomings in terms of chemical stability, toxicity, and light absorption range. The limited gamut of currently available colloidal LnSNCs is unfortunate, given the tremendous technological impact that these nanomaterials could have in fields like biomedicine and optoelectronics. In this Review, we provide an overview of the field of colloidal LnSNCs, while distilling the lessons learnt in terms of material design. The result is a compendium of key aspects to consider when devising and synthesizing this class of nanomaterials, with a keen eye on the foreseeable technological scenarios where they are poised to become front runners.* In their book "Understanding Chemistry", Pimentel and Sprately commented how "Lanthanum has only one important oxidation state in aqueous solution, the +3 state. With few exceptions, this tells the whole boring story about the other 14 Lanthanides". Scheme 1. Aspects discussed in this Review about colloidal Ln 3+ -doped semiconductor nanocrystals (LnSNCs). * In 1798, B. M. Tassaert reported the first coordination compound of cobalt and ammonia without, however, fully understanding the material. Passing through S. M. Jörgensen's chain theory to explain metal complexes, it was only in 1893 that A. Werner finally realized the existence of a principal (oxidation state) and auxiliary (coordination number) for the metal in that "odd" class of complex compounds (as Tassaert first referred to them).* This last statement is only partially true. There are slight changes in the position of the 4f-4f emission lines of Ln 3+ depending on the coordination environment of the ion. The extent of such shifts is of up to a few hundred wavenumbers at most and they occur because of the so-called nephelauxetic effect, where changes in the bond length between Ln 3+ and the surrounding anions result in variation of 4f electronic distribution. * A Lewis acid is a species that accepts lone electron pairs from a donor species (Lewis bases). The less (more) the Lewis acid is polarizable, the harder (softer) its acid character is, according to the hard soft acids bases (HSAB) theory. This acidity can be regarded as a measure of how "thirsty" for electrons a species is.* Preliminary information a...

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“…For Cs 2 SnI 6 nanocrystals, Wang and co‐workers [ 117 ] assumed that OLA acted as a complexing agent for Sn 4+ ions, while OA played a role in suppressing nanocrystals growth. Intriguingly, the Cs 2 CuSbCl 6 [ 131 ] and CsEuCl 3 [ 44 ] nanocrystals were synthesized by hot injection method, which crafty used the reduction nature from OLA to reduce Cu 2+ and Eu 3+ to Cu + and Eu 2+ as reaction precursor, respectively. Another critical role of organic ligands is passivating the surface defects of HDP nanocrystals by surface capping, which could enhance radiative recombination rates.…”

Section: Strategies For Boosting the Efficiency Of Halide Double Peromentioning

confidence: 99%

“…[ 39,40 ] Hence, the designing of lead‐free halide perovskite nanocrystals with excellent photoelectric properties and higher stability has important theoretical and practical significance. So far, various lead‐free halide perovskite nanocrystals have been synthesized and characterized, such as CsB 2+ X 3 (B = Sn 2+ , Ge 2+ , Yb 2+ , and Eu 2+ ) nanocrystals, [ 41–44 ] Cs 3 B 3+ 2 X 9 (B = Sb 3+ , Bi 3+ ) nanocrystals, [ 45,46 ] and Cs 3 Cu 2 X 5 (X = Cl, Br, and I) nanocrystals. [ 47,48 ] However, these emerging nanocrystals are still suffering from the problems of instability, larger bandgap, and defect intolerance.…”

Section: Introductionmentioning

confidence: 99%

Lead‐Free Halide Double Perovskite Nanocrystals for Light‐Emitting Applications: Strategies for Boosting Efficiency and Stability

et al. 2021

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Lead‐free halide double perovskite (HDP) nanocrystals are considered as one of the most promising alternatives to the lead halide perovskite nanocrystals due to their unique characteristics of nontoxicity, robust intrinsic thermodynamic stability, rich and tunable optoelectronic properties. Although lead‐free HDP variants with highly efficient emission are synthesized and characterized, the photoluminescent (PL) properties of colloidal HDP nanocrystals still have enormous challenges for application in light‐emitting diode (LED) devices due to their intrinsic and surface defects, indirect band, and disallowable optical transitions. Herein, recent progress on the synthetic strategies, ligands passivation, and metal doping/alloying for boosting efficiency and stability of HDP nanocrystals is comprehensive summarized. It begins by introducing the crystalline structure, electronic structure, and PL mechanism of lead‐free HDPs. Next, the limiting factors on PL properties and origins of instability are analyzed, followed by highlighting the effects of synthesis strategies, ligands passivation, and metal doping/alloying on the PL properties and stability of the HDPs. Then, their preliminary applications for LED devices are emphasized. Finally, the challenges and prospects concerning the development of highly efficient and stable HDP nanocrystals‐based LED devices in the future are proposed.

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Lead-free Cesium Europium Halide Perovskite Nanocrystals

Cited by 122 publications

References 45 publications

Lead‐Free Halide Perovskites for Light Emission: Recent Advances and Perspectives

Lead‐Free Halide Perovskites for Light Emission: Recent Advances and Perspectives

Doping Lanthanide Ions in Colloidal Semiconductor Nanocrystals for Brighter Photoluminescence

Lead‐Free Halide Double Perovskite Nanocrystals for Light‐Emitting Applications: Strategies for Boosting Efficiency and Stability

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