High‐Performance Color‐Tunable Perovskite Light Emitting Devices through Structural Modulation from Bulk to Layered Film

Chen, Ziming; Zhang, Chongyang; Jiang, Xiaofang; Liu, Meiyue; Xia, Ruoxi; Shi, Tingting; Chen, Dongcheng; Xue, Qifan; Zhao, Yue; Su, Shi‐Jian; Yip, Hin‐Lap; Cao, Yong

doi:10.1002/adma.201603157

Cited by 230 publications

(227 citation statements)

References 63 publications

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“…However, the precise control of the number of layers is difficult, and the mixed phases of 2D perovskite with various n values trigger multiple emission peaks . For multiple emissive 2D perovskite, a major portion of the bulk organic cations are consumed by the 2D perovskite with n = 1, and the remaining short‐chain precursors are used to nucleate phases with high n values .…”

Section: Component Engineering For Blue‐emissive Perovskitesmentioning

confidence: 99%

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

Fang

Zhang

Yuan

et al. 2019

InfoMat

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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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Section: Component Engineering For Blue‐emissive Perovskitesmentioning

confidence: 99%

“…However, it is difficult to precisely control the number of layers of perovskite films. In general, quasi‐2D perovskite LEDs with different n values exhibit just a green emission EL peak, or even worse, multiple EL peaks, due to the energy and charge transfer. This phenomenon has been reported many times.…”

Section: Blue Perovskite Ledsmentioning

confidence: 99%

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

Fang

Zhang

Yuan

et al. 2019

InfoMat

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“…This material exhibits strong exciton behavior. There are many options for organic ligands such as phenylethylammonium (PEA), butylammonium, ethylammonium, phenylmethylamine, phenylbutylammonium, naphthylmethylamine, and 2‐phenoxyethylamine …”

Section: Synthesis Of Perovskite Ncsmentioning

confidence: 99%

Metal halide perovskite nanocrystals and their applications in optoelectronic devices

Wang

et al. 2019

InfoMat

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In recent years, metal halide perovskite nanocrystals (NCs) have been favored by many researchers due to their unique properties including long carrier diffusion length, high carrier mobility, tunable emission wavelength, and narrow full width at half maximum, making them great application potentials in optoelectronic devices. The photoluminescence quantum yields of perovskite NCs are nearly 100%, and the device efficiency of perovskite NC‐based light‐emitting diodes (LEDs) has been improved significantly from below 0.1% to over 20%. In addition, perovskite NC‐based solar cells and photodetectors have also developed rapidly in recent years. Here, we summarize the synthesis and the basic optoelectronic properties of metal halide perovskite NCs and introduce their applications in LEDs, solar cells, and photodetectors.

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“…Mixing various organic ammoniums in the A‐site in the perovskite structure can also yield uniform MHP PC films with reduced grain size. Especially, large organic ammoniums such as phenylethyl ammonium (PEA) and 2‐phenoxyethylamine (POEA) impede the growth of MAPbX 3 crystals and thus reduce the grain size in the films. Furthermore, large organic ammoniums can separate 3D MHP crystals (MAPbX 3 ) by locating between PbX 6 octahedral planes; these form a quasi‐2D structure Ruddlesden–Popper (RP), and increase E B and PLQE by confining electron‐hole pairs inside the 3D MHP crystals.…”

Section: Solution‐processed Polycrystalline Bulk Films and Light‐emitmentioning

confidence: 99%

Metal Halide Perovskites: From Crystal Formations to Light‐Emitting‐Diode Applications

Kim

et al. 2018

Small Methods

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Metal halide perovskites (MHPs) are promising light emitters because they have high color purity, high charge‐carrier mobility, comparable energy levels with organic semiconductors, and the possibility of diverse crystal forms and various crystal formation methods. Since the first report of MHP light‐emitting diodes (PeLEDs) in 2014, many researchers have devoted efforts to increase the luminescence efficiencies of MHPs in various crystal forms, and achieved dramatically improved photoluminescence quantum efficiency of >90% in MHP emitters and external quantum efficiency of ≈14.36% in PeLEDs. Here, the recent progress regarding PeLEDs is reviewed by categorizing MHPs into three types: polycrystalline bulk films, colloidal nanocrystals, and single crystals. The main focus is on photophysical properties, crystallization methods, and mechanisms of various crystal formation, and applications to PeLEDs. Future research directions are also suggested and an outlook for MHP emitters and PeLEDs is given.

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High‐Performance Color‐Tunable Perovskite Light Emitting Devices through Structural Modulation from Bulk to Layered Film

Cited by 230 publications

References 63 publications

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

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

Metal halide perovskite nanocrystals and their applications in optoelectronic devices

Metal Halide Perovskites: From Crystal Formations to Light‐Emitting‐Diode Applications

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