Boosting Efficiency in Polycrystalline Metal Halide Perovskite Light-Emitting Diodes

Park, Min‐Ho; Kim, Sang Woo; Heo, Jung-Min; Ahn, Soyeong; Jeong, Seong Mok; Lee, Tae‐Woo

doi:10.1021/acsenergylett.9b00518

Cited by 75 publications

(67 citation statements)

References 133 publications

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“…1,2 OIHP materials combine solution processability, tunable bandgap, narrowband emission, and facile synthesis, which makes them very promising for next-generation lighting and displays. [3][4][5][6] Recent research efforts have focused on the enhancement of their LED performance, [7][8][9] as reflected by the demonstration of ultrahigh external quantum efficiencies (Z ext 4 20%), [10][11][12][13] based on the bulk and quasi-2D forms of OIHP thin films. We notice that high efficiency devices have been realized in both bromide and iodide systems using bulk polycrystalline or quasi-2D/3D mixed films; yet it remains controversial if the observed high efficiencies can be extended to cover the entire visible spectrum.…”

Section: Introductionmentioning

confidence: 99%

Efficient perovskite nanocrystal light-emitting diodes using a benzimidazole-substituted anthracene derivative as the electron transport material

et al. 2019

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Section: Introductionmentioning

confidence: 99%

Efficient perovskite nanocrystal light-emitting diodes using a benzimidazole-substituted anthracene derivative as the electron transport material

et al. 2019

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“…MHP has gained great attention due to their superior electrical and optical properties and showed high potential for various optoelectronic application including solar cells, [ 1,2 ] lasers, [ 3,4 ] photodetectors, [ 5,6 ] and light‐emitting diodes (LEDs). [ 7–11 ]…”

Section: Introductionmentioning

confidence: 99%

Understanding the Synergistic Effect of Device Architecture Design toward Efficient Perovskite Light‐Emitting Diodes Using Interfacial Layer Engineering

Lee

Jang

Park

et al. 2020

Adv Materials Inter

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Metal halide perovskite (MHP) light‐emitting diodes (LEDs) have been widely studied and have been reached to >20% external quantum efficiency, owing to their attractive characteristics (e.g., solution processability, tunable bandgap and extremely high color purity, high mobility). During the rapid development of perovskite light‐emitting diodes (PeLEDs), modifying the device architecture has been widely studied as well as improving the crystal quality of MHP to achieve near‐unity photoluminescence quantum yield. However, efforts in device architecture engineering have received less attention despite their significance. Here, strategies are reviewed to enhance the efficiency of PeLEDs in terms of the device engineering by interfacial charge injection/transport, exciton‐quenching blocking, and defect passivation layers for enhancing radiative electron–hole recombination. Strategies are systematically classified for each layer in PeLEDs and discussed the synergetic effect between different strategies. Perspective is also provided on future research on PeLEDs focusing on their architecture.

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“…[ 14 ] For instance, in the red light range of polycrystalline metal halide perovskite thin films, the emission colors can be tuned monotonically from deep red to pure red by changing the inside halide ratio of I and Br. [ 16 ] The mixed halide perovskites with 3D structures possess high charge carrier mobilities, [ 27 ] implying their great potential as emission layers for high‐performance LEDs. In addition, the Cs‐based all‐inorganic 3D perovskite thin films exhibit good thermal and chemical stability for the fabrication of stable metal halide perovskite LEDs.…”

Section: Introductionmentioning

confidence: 99%

High Quality CsPbI₃₋_xBr_x Thin Films Enabled by Synergetic Regulation of Fluorine Polymers and Amino Acid Molecules for Efficient Pure Red Light Emitting Diodes

Wang

Liu

et al. 2020

Advanced Optical Materials

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All‐inorganic CsPbX3 (X = Cl, Br, or I) perovskite thin films are attractive emissive layers for high‐performance light‐emitting diodes (LEDs) due to their precisely tunable bandgaps, excellent color purities, good stabilities, and solution processabilities. However, the fabrication of high‐quality CsPbI3−xBrx thin films is very challenging because the crystal growth of mixed halide CsPbI3−xBrx is in low controllability. Herein, a synergetic regulation strategy using fluorine polymer (Poly(vinylidene fluoride‐co‐hexafluoropropylene)) and a small amino acid molecule (L‐Arginine) is developed to fabricate high‐quality CsPbI3−xBrx thin films for efficient pure red perovskite LEDs. In the fabricated CsPbI3−xBrx thin film, the fluorine polymer plays a crucial role in confining CsPbI3−xBrx crystal size at the nanoscale and the small amino acid molecule acts as a passivation agent to reduce the trap‐state density. Under this synergetic effect, a uniform CsPbI3−xBrx thin film with a high photoluminescence quantum yield up to 40% can be obtained to fabricate an efficient pure red perovskite LED with a maximum external quantum efficiency of 4.5% and a maximum brightness of 3100 cd m−2. The reported synergistic regulation strategy will open a new avenue to fabricate efficient pure color CsPbX3 perovskite LEDs.

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Boosting Efficiency in Polycrystalline Metal Halide Perovskite Light-Emitting Diodes

Cited by 75 publications

References 133 publications

Efficient perovskite nanocrystal light-emitting diodes using a benzimidazole-substituted anthracene derivative as the electron transport material

Efficient perovskite nanocrystal light-emitting diodes using a benzimidazole-substituted anthracene derivative as the electron transport material

Understanding the Synergistic Effect of Device Architecture Design toward Efficient Perovskite Light‐Emitting Diodes Using Interfacial Layer Engineering

High Quality CsPbI₃₋_xBr_x Thin Films Enabled by Synergetic Regulation of Fluorine Polymers and Amino Acid Molecules for Efficient Pure Red Light Emitting Diodes

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Boosting Efficiency in Polycrystalline Metal Halide Perovskite Light-Emitting Diodes

Cited by 75 publications

References 133 publications

Efficient perovskite nanocrystal light-emitting diodes using a benzimidazole-substituted anthracene derivative as the electron transport material

Efficient perovskite nanocrystal light-emitting diodes using a benzimidazole-substituted anthracene derivative as the electron transport material

Understanding the Synergistic Effect of Device Architecture Design toward Efficient Perovskite Light‐Emitting Diodes Using Interfacial Layer Engineering

High Quality CsPbI3−xBrx Thin Films Enabled by Synergetic Regulation of Fluorine Polymers and Amino Acid Molecules for Efficient Pure Red Light Emitting Diodes

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High Quality CsPbI₃₋_xBr_x Thin Films Enabled by Synergetic Regulation of Fluorine Polymers and Amino Acid Molecules for Efficient Pure Red Light Emitting Diodes