Pure Bromide‐Based Perovskite Nanoplatelets for Blue Light‐Emitting Diodes

Peng, Shaomin; Wang, Sisi; Zhao, Dandan; Li, Xiaojun; Liang, Chao; Xia, Junmin; Zhang, Tianqi; Xing, Guichuan; Tang, Zikang

doi:10.1002/smtd.201900196

Cited by 41 publications

(42 citation statements)

References 119 publications

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“…Substantial efforts have been made in the past several years to obtain blue perovskite emitters, such as perovskite nanocrystals (NCs), [ 19–25 ] 2D perovskite nanoplatelets, [ 26–32 ] and quasi‐2D perovskites. [ 33–39 ] In particular, the quasi‐2D perovskites are rising as efficient luminescent materials for highly performed blue PeLEDs due to the cascade energy landscape for efficient exciton transfer and the subsequent radiative recombination.…”

Section: Figurementioning

confidence: 99%

High‐Performance Blue Perovskite Light‐Emitting Diodes Enabled by Efficient Energy Transfer between Coupled Quasi‐2D Perovskite Layers

et al. 2020

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Recently, impressive external quantum efficiencies (EQEs) exceeding 20% are obtained for green, red, and near-infrared perovskitebased LEDs (PeLEDs) through the efforts of perovskite material optimization and device architecture design. [8-10] These achievements firmly prompt the potential applications of PeLEDs in display and illumination fields. However, compared with the efficient PeLEDs, there is only moderate performance reported for blue PeLEDs, [11-18] which undoubtedly restrict PeLED applications in full-color displays and white-light illumination. Thus, the breakthroughs of the device performance are urgently required for blue PeLEDs. Substantial efforts have been made in the past several years to obtain blue perovskite emitters, such as perovskite nanocrystals (NCs), [19-25] 2D perovskite nanoplatelets, [26-32] and quasi-2D perovskites. [33-39] In particular, the quasi-2D perovskites are rising as efficient luminescent materials for highly performed blue PeLEDs due to the cascade energy landscape for efficient exciton transfer and the subsequent radiative recombination. Typically, the quasi-2D perovskites have a formula of B 2 (APbBr 3) n−1 PbBr 4 , While there has been extensive investigation into modulating quasi-2D perovskite compositions in light-emitting diodes (LEDs) for promoting their electroluminescence, very few reports have studied approaches involving enhancement of the energy transfer between quasi-2D perovskite layers of the film, which plays very important role for achieving high-performance perovskite LEDs (PeLEDs). In this work, a bifunctional ligand of 4-(2-aminoethyl)benzoic acid (ABA) cation is strategically introduced into the perovskite to diminish the weak van der Waals gap between individual perovskite layers for promoting coupled quasi-2D perovskite layers. In particular, the strengthened interaction between coupled quasi-2D perovskite layers favors an efficient energy transfer in the perovskite films. The introduced ABA can also simultaneously passivate the perovskite defects by reducing metallic Pb for less nonradiative recombination loss. Benefiting from the advanced properties of ABA incorporated perovskites, highly efficient blue PeLEDs with external quantum efficiency of 10.11% and a very long operational stability of 81.3 min, among the best performing blue quasi-2D PeLEDs, are achieved. Consequently, this work contributes an effective approach for high-performance and stable blue PeLEDs toward practical applications. Metal halide perovskites have emerged as competitive candidates for the next-generation light-emitting diodes (LEDs) due to their excellent optical properties, such as tunable light emission color, high color purity, and high photoluminescence The ORCID identification number(s) for the author(s) of this article can be found under

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Section: Figurementioning

confidence: 99%

High‐Performance Blue Perovskite Light‐Emitting Diodes Enabled by Efficient Energy Transfer between Coupled Quasi‐2D Perovskite Layers

et al. 2020

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“…[ 5,6 ] However, the PLQY of blue‐emitting perovskite has struggled to match this such admirable value. [ 7–11 ] This exceedingly unbalanced development of three primary colors triggered by the low blue photoluminescence efficiency seriously hinders the further practical application of perovskite. [ 12–14 ] Although recent remarkable efforts have been devoted to remedy this regret, [ 15–18 ] at present, it is generally recognized that achieving high blue emitting PLQY with stable and pure spectra is challenging.…”

Section: Introductionmentioning

confidence: 99%

“…In general, two strategies have been developed to achieve blue emission: Dimension engineering and component engineering. [ 8,13,20–22 ] The dimension engineering is constructing quantum well structures by synthesizing 2D or quasi‐2D Br‐based perovskite, allowing the emission wavelength to shift toward the blue region based on the quantum confinement effect. [ 23 ] Recently, lots of outstanding work regarding dimension engineering have greatly promoted the research of blue emitting perovskite.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast Thermodynamic Control for Stable and Efficient Mixed Halide Perovskite Nanocrystals

Luo

et al. 2020

Adv Funct Materials

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Low photoluminescence quantum yield (PLQY) and spectra instability, the two most difficult challenges in blue-emitting CsPbBr x Cl 3−x NCs, have not yet been solved. Quickly controlling the reaction thermodynamics is crucial to enhance crystallinity, thus PLQY and spectra stability, but it has been ignored until now. An ultrafast thermodynamic control (UTC) strategy is designed by utilizing liquid nitrogen to instantaneously freeze the superior crystal lattices of CsPbBr x Cl 3−x NCs formed at high temperature. The average cooling rate exhibits a 33-fold increase compared to conventional ice-water cooling (from 1.5 to 50 K s −1 ). This UTC can make the reaction thermodynamic energy of the system lower than the threshold very quickly. Therefore, abrupt termination of further crystal growth can be achieved, which also avoids additional nucleation at low temperature. With the assist of defect passivation, the final blue-emitting CsPbBr x Cl 3−x NCs exhibit an absolute PLQY of 98%, representing the highest value in Pb-based blue perovskites to date. More importantly, they exhibit superior spectra instability. This UTC strategy not only represents a new avenue to synthesize perovskite NCs with excellent crystal quality and ultrahigh PLQY, but also provides a good reference to deal with the recognized bottleneck of spectra instability.

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“…[28] The efficiency gap has been reduced in the past two years; quite recently, a record EQE of 12.3% was demonstrated for blue PeLEDs based on high-quality CsPbBr3 perovskite QDs. [32] [113] The low PLQY of blue perovskites is an impediment to high-performance blue PeLEDs. [114] Previous studies have revealed that the PLQY dramatically decreases as the light emission shifts to the blue region.…”

Section: Developments and Statusmentioning

confidence: 99%

Color Tuning for Perovskite Light-Emitting Diodes

2020

Linköping Studies in Science and Technology. Dissertations

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Metal halide perovskites (MHPs) are recognized as promising semiconductor materials for a variety of optical and electrical device applications due to their cost-effective and outstanding optoelectronic properties. As one of the most significant applications, perovskite light-emitting diodes (PeLEDs) hold promise for future lighting and display technologies, attributed to their high photoluminescence quantum yield (PLQY), high color purity, and tunable emission color. The emission colors of PeLEDs can be tuned by mixing the halide anions, adjusting the size of perovskite nanocrystals, or changing the dimensionality of perovskites. However, in practice, all these different approaches have their own advantages and challenges. This thesis centres around the color tunability of perovskites, aiming to develop PeLEDs with different colors using different approaches.

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Pure Bromide‐Based Perovskite Nanoplatelets for Blue Light‐Emitting Diodes

Cited by 41 publications

References 119 publications

High‐Performance Blue Perovskite Light‐Emitting Diodes Enabled by Efficient Energy Transfer between Coupled Quasi‐2D Perovskite Layers

High‐Performance Blue Perovskite Light‐Emitting Diodes Enabled by Efficient Energy Transfer between Coupled Quasi‐2D Perovskite Layers

Ultrafast Thermodynamic Control for Stable and Efficient Mixed Halide Perovskite Nanocrystals

Color Tuning for Perovskite Light-Emitting Diodes

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