Quantum confinement effect of two-dimensional all-inorganic halide perovskites

Cai, Bo; Li, Xiaoming; Gu, Yu; Harb, Moussab; Li, Jianhai; Xie, Meiqiu; Cao, Fei; Song, Jizhong; Zhang, Shengli; Cavallo, Luigi; Zeng, Haibo

doi:10.1007/s40843-017-9090-0

Cited by 40 publications

(39 citation statements)

References 38 publications

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“…According to Figure d, the first absorption peak of quasi‐2D CsPbBr 3 NSs aqueous solution is around 518 nm, while its PL emission peak is located at 523 nm. Because of quantum confinement effect (QCE), there is a slight blue‐shift of PL emission peak compared to its bulk material . This aqueous solution will show bright green fluorescence when irradiated by UV light (Figure S3d, Supporting Information), and its PLQY is remarkably as high as 82.3% for the completely water‐dispersed lead‐halide perovskites …”

Section: Summary Of Time‐resolved Pl Biexponential Fitting Parametersmentioning

confidence: 99%

Aqueous Phase Exfoliating Quasi‐2D CsPbBr₃ Nanosheets with Ultrahigh Intrinsic Water Stability

Xie

Liu

Chun

et al. 2019

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All-inorganic cesium lead halide (CsPbX 3 , X = Cl, Br, and I) perovskite nanocrystals (NCs) have gained increasing attention in recent years, due to their excellent optical and electronic properties that are critical in the fabrication of efficient optoelectronic [1] and photovoltaic devices. [2] Currently, the external quantum efficiency (EQE) of perovskite light-emitting diodes (LEDs) has exceeded 20% [1d,e] while the perovskite solar cells have recently reached a power conversion efficiency (PCE) of 23.7%. [3] However, the major obstacle to future commercialization of perovskite NCs is their inherent vulnerability due to their ionic nature. [4] Therefore, perovskite NCs will decompose fast when exposed to ambient, especially in the presence of water or even in a moist environment. [5] But the appearance of water is inevitable during the process of materials synthesis and devices fabrication, which will badly influence the device stability and performance. So, the intrinsic water stability improvement of all-inorganic perovskite plays a key role to effectively enhance the long-time stability of perovskite materials and enormously promote the commercial applications of perovskite-based optoelectronic and photovoltaic devices.To overcome the poor water stability of perovskite NCs arising from their intrinsically high ionic character, many strategies have been developed. Typically, the substitution of the more stable ligands for the commonly used oleic acid (OA) and oleylamine (OLA) can suppress the degradation and maintain the crystal structures in water or other polar solvent. [6] In addition, polymer materials can effectively encapsulate perovskite NCs and avoid them directly contact with the external environment, which ensure the high environment stability especially superior water resistance of the peovskite-polymer composites. [7] Moreover, embedding perovskite NCs into inorganic matrix such as ionic salt, metallic oxide and silica also can obtain relatively ideal environment stability. [8] Although all of these works remarkably enhance the water stability of perovskite materials, these strategies mainly focus on isolating the materials from the external environment but not intrinsically improving its water stability. And also, these isolated materials will have a negative effect on charge transfer ability. Therefore, to develop the novel perovskite materials with both long-term intrinsic water stability and good charge transport ability is extremely urgent for optoelectronic and photovoltaic devices.All-inorganic cesium lead halide perovskite nanocrystals (NCs) have emerged as attractive optoelectronic materials due to the excellent optical and electronic properties. However, their environmental stability, especially in the presence of water, is still a significant challenge for their further commercialization. Here, ultrahigh intrinsically water-stable all-inorganic quasi-2D CsPbBr 3 nanosheets (NSs) via aqueous phase exfoliation method are reported. Compared to conventional perovskite NCs, these u...

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Section: Summary Of Time‐resolved Pl Biexponential Fitting Parametersmentioning

confidence: 99%

Aqueous Phase Exfoliating Quasi‐2D CsPbBr₃ Nanosheets with Ultrahigh Intrinsic Water Stability

Xie

Liu

Chun

et al. 2019

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“…Quantum confinement effect Similar to other low-dimensional materials, 2D perovskite, has quantum confinement effect [51]. The 2D perovskite has a wider band gap and narrow photoluminescence (PL) peak compared with the 3D analogue [42,52].…”

Section: Quantum Confinement Effect and Exciton Properties In 2d Peromentioning

confidence: 99%

Two-dimensional organic-inorganic hybrid perovskite: from material properties to device applications

Cai

Cheng

et al. 2018

Sci. China Mater.

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“…Over the past few years, LEDs based on metal halide perovskites (MHPs) have shown great potential as candidate in blue-emissive LEDs. 12,[21][22][23][24][25][26][27][28][29] MHPs possess excellent optoelectronic properties, [30][31][32][33][34][35][36][37][38][39] such as narrow emission linewidths (full width at half-maximum [FWHM] < 20 nm), precise tunable bandgaps (ranging from ultraviolet to near-infrared), and high charge carrier mobility and defect tolerance. The ultrahigh color purity and wide color gamut (~150%; the color gamut level for the national television standards committee [NTSC] standard is <100%) grant MHP LEDs great prospects in display applications.…”

Section: Introductionmentioning

confidence: 99%

Recent advances and prospects toward blue perovskite materials and light‐emitting diodes

Fang

Zhang

Yuan

et al. 2019

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Perovskite based light‐emitting diodes (PeLEDs) have become a powerful candidate for next‐generation solid‐state lightings and high‐definition displays due to their high photoluminescence quantum yield (PLQY), tunable emission wavelength over the visible spectrum, and narrow emission linewidths. Over the past few years, the development of red‐ and green‐emissive PeLEDs has rapidly increased, and the corresponding external quantum efficiencies (EQE) have exceeded 20%. However, the research progress of blue‐emitting PeLEDs is limited by its poor material quality and inappropriate device structure. Currently, the maximum EQE of blue PeLED is only 6.2%, which is far from the industrialization requirements. In order to promote the development of blue PeLEDs, we summarize the recent research progress of blue perovskite materials and LEDs and discuss several fatal challenges, mainly embodied in low efficiency and poor stability. In order to overcome these challenges, detailed analysis and strategies are put forward in terms of the materials and devices. For the former, we summarize the feasible strategy for the preparation of efficient and stable blue‐emissive perovskites using component engineering. For the latter, we analyze the advantages and limitations of the different strategies for blue‐emissive perovskite in LEDs. At the end of the review, a comprehensive outlook is detailed, including future development directions and several technical problems to be solved. Thus, we aim to highlight the significance and promote the industrialization of PeLEDs.

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Quantum confinement effect of two-dimensional all-inorganic halide perovskites

Cited by 40 publications

References 38 publications

Aqueous Phase Exfoliating Quasi‐2D CsPbBr₃ Nanosheets with Ultrahigh Intrinsic Water Stability

Aqueous Phase Exfoliating Quasi‐2D CsPbBr₃ Nanosheets with Ultrahigh Intrinsic Water Stability

Two-dimensional organic-inorganic hybrid perovskite: from material properties to device applications

Recent advances and prospects toward blue perovskite materials and light‐emitting diodes

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Quantum confinement effect of two-dimensional all-inorganic halide perovskites

Cited by 40 publications

References 38 publications

Aqueous Phase Exfoliating Quasi‐2D CsPbBr3 Nanosheets with Ultrahigh Intrinsic Water Stability

Aqueous Phase Exfoliating Quasi‐2D CsPbBr3 Nanosheets with Ultrahigh Intrinsic Water Stability

Two-dimensional organic-inorganic hybrid perovskite: from material properties to device applications

Recent advances and prospects toward blue perovskite materials and light‐emitting diodes

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Aqueous Phase Exfoliating Quasi‐2D CsPbBr₃ Nanosheets with Ultrahigh Intrinsic Water Stability

Aqueous Phase Exfoliating Quasi‐2D CsPbBr₃ Nanosheets with Ultrahigh Intrinsic Water Stability