Focus on perovskite emitters in blue light-emitting diodes

Yang, Xiaoyu; Ma, Lingling; Yu, Maotao; Chen, H.; Ji, Yongqiang; Ai, Hu; Zhong, Qixuan; Jia, Xiaohan; Wang, Yanju; Zhang, Yuzhuo; Zhu, Rui; Wang, Xinqiang; Lu, Changjun

doi:10.1038/s41377-023-01206-2

Cited by 33 publications

(14 citation statements)

References 123 publications

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“…This strategy could be extended to other perovskite emitters with different compositions and domain shapes as well (Figure S16). For example, in situ growth of perovskite nanoplatelets on the substrate will be a promising direction to further improve the device efficiency by the enhancement of light out-coupling and carrier injections . In brief, high-quality perovskite nanodomain films have been successfully applied to near-infrared emissions, showing great potential to be a proprietary emitter form of lead-halide perovskites and to push the perovskite display technology a step forward.…”

Section: Discussionmentioning

confidence: 99%

Amphoteric Chelating Ultrasmall Colloids for FAPbI₃ Nanodomains Enable Efficient Near-Infrared Light-Emitting Diodes

Ji,

Zhong,

et al. 2024

ACS Nano

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Perovskite light-emitting diodes (PeLEDs) are the next promising display technologies because of their high color purity and wide color gamut, while two classical emitter forms, i.e., polycrystalline domains and quantum dots, are encountering bottlenecks. Weak carrier confinement of large polycrystalline domains leads to inadequate radiative recombination, and surface ligands on quantum dots are the main annihilation sites for injected carriers. Here, pinpointing these issues, we screened out an amphoteric agent, namely, 2-(2aminobenzoyl)benzoic acid (2-BA), to precisely control the in situ growth of FAPbI 3 (FA: formamidine) nanodomains with enhanced space confinement, preferred crystal orientation, and passivated trap states on the transport-layer substrate. The amphoteric 2-BA performs bidentate chelating functions on the formation of ultrasmall perovskite colloids (<1 nm) in the precursor, resulting in a smoother FAPbI 3 emitting layer. Based on monodispersed and homogeneous nanodomain films, a near-infrared PeLED device with a champion efficiency of >22% plus enhanced T 80 operational stability was achieved. The proposed perovskite nanodomain film tends to be a mainstream emitter toward the performance breakthrough of PeLED devices covering visible wavelengths beyond infrared.

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Section: Discussionmentioning

confidence: 99%

Amphoteric Chelating Ultrasmall Colloids for FAPbI₃ Nanodomains Enable Efficient Near-Infrared Light-Emitting Diodes

Ji,

Zhong,

et al. 2024

ACS Nano

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“…Piezoelectric ceramics with ABO 3 perovskite structures [1][2][3][4][5][6][7], exemplified by sodium bismuth titanate (Na 0.5 Bi 0.5 TiO 3 , NBT), have gained significant prominence in the realm of materials science. Their advantages stem from distinctive attributes, including a high Curie temperature, substantial residual polarization, and robust ferroelectric characteristics [8,9].…”

Section: Introductionmentioning

confidence: 99%

Effect of sintering temperature on microstructure and electrical properties of Na_0.5Bi_0.47Sr_0.02TiO_3-δ ceramics

Ma,

Wei,

Kong

et al. 2024

Mater. Res. Express

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In this investigation, a series of Na0.5Bi0.47Sr0.02TiO3-δ samples are sintered from1000 to 1100℃, were synthesized utilizing the solid-state method. The XRD results indicate that all samples exhibit a perovskite phase, with the exception of those sintered at 1100 ℃, which display no discernible impurity peaks.The SEM results indicate that the average grain size exhibits an increase proportionate to the sintering temperature,which attributes to the variations in the actual Na/Bi ratio. From the study of grain conductivity we can obtain that the dominant factor affecting grain conductivity is the activation energy.At 1100℃,the oxygen vacancy concentration emerges as the primary determinant of grain conductivity. It should be noticed that the phase transition temperature of the sample increases (350℃→400℃) with the increase of sintering temperature, which is due to the local A-site disorder aggravated by high temperature sintering. Therefore, reducing the sintering temperature is beneficial to improve the grain conductivity. The grain boundary conductivity initially rises, then diminishes with increasing sintering temperature.It is evident that the enhanced macroscopic grain boundary conductivity stems from a marked reduction in space charge potential within the 1000-1025℃ temperature range. Within the 1050℃-1100℃ temperature range,the space charge potential barely changed,the significant decrease of intrinsic grain boundary conductivity can be attributed to the surge in the coverage ratio of grain boundary impurities and the number of grain boundary impurities increased caused by the rapid reduction of grain boundary area and thermal evaporation.The research on electrical performance of NBT-based oxygen-ion conductors will promote the application of NBT-based oxygen ion conductors in solid oxide fuel cells, oxygen sensors and other fields.

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“…Blue light-emitting diodes (LEDs) are the indispensable core components for the application of LED technology in solid-state lighting and full-color displays. − A quasi-two-dimensional (quasi-2D) perovskite rising as a promising luminescent material with greater exciton binding energy, more efficient cascade energy transfer, and higher quantum efficiency than their three-dimensional counterparts holds great potential for blue LED applications. − However, small n -phases ( n = 1, 2) with low formation energy are generously generated in a quasi-2D perovskite, resulting in inefficient interphase energy transfer . Furthermore, the introduction of large insulating organic cations, which causes a lower carrier mobility than their 3D counterparts, leads to an imbalanced carrier transport .…”

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confidence: 99%

High-Performance Blue Perovskite Light-Emitting Diodes Enabled by Synergistic Effect of Additives

Zhang,

Yang,

Gao

et al. 2024

Nano Lett.

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While quasi-two-dimensional (quasi-2D) perovskites have good properties of cascade energy transfer, high exciton binding energy, and high quantum efficiency, which will benefit high-efficiency blue PeLEDs, inefficient domain distribution management and unbalanced carrier transport impede device performance improvement. Herein, (2-(9H-carbazol-9-yl)ethyl)phosphonic acid (2PACz) and methyl 2-aminopyridine-4-carboxylate (MAC) were simultaneously introduced to a blue quasi-2D perovskite film. Relying on the synergistic effect of 2PACz and MAC, it not only modulates the phase distribution inhibiting the n = 2 phase but also greatly improves the electrical property of the quasi-2D perovskite film. As a result, the as-modified blue quasi-2D PeLED demonstrated an external quantum efficiency (EQE) of 17.08% and a luminance of 10142 cd m −2 . This study exemplifies the synergistic effect among dual additives and offers a new effective additive strategy modulating phase distribution and building balanced carrier transport, which paves the way for the fabrication of highly efficient blue PeLEDs.

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Focus on perovskite emitters in blue light-emitting diodes

Cited by 33 publications

References 123 publications

Amphoteric Chelating Ultrasmall Colloids for FAPbI₃ Nanodomains Enable Efficient Near-Infrared Light-Emitting Diodes

Amphoteric Chelating Ultrasmall Colloids for FAPbI₃ Nanodomains Enable Efficient Near-Infrared Light-Emitting Diodes

Effect of sintering temperature on microstructure and electrical properties of Na_0.5Bi_0.47Sr_0.02TiO_3-δ ceramics

High-Performance Blue Perovskite Light-Emitting Diodes Enabled by Synergistic Effect of Additives

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Focus on perovskite emitters in blue light-emitting diodes

Cited by 33 publications

References 123 publications

Amphoteric Chelating Ultrasmall Colloids for FAPbI3 Nanodomains Enable Efficient Near-Infrared Light-Emitting Diodes

Amphoteric Chelating Ultrasmall Colloids for FAPbI3 Nanodomains Enable Efficient Near-Infrared Light-Emitting Diodes

Effect of sintering temperature on microstructure and electrical properties of Na0.5Bi0.47Sr0.02TiO3-δ ceramics

High-Performance Blue Perovskite Light-Emitting Diodes Enabled by Synergistic Effect of Additives

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Amphoteric Chelating Ultrasmall Colloids for FAPbI₃ Nanodomains Enable Efficient Near-Infrared Light-Emitting Diodes

Amphoteric Chelating Ultrasmall Colloids for FAPbI₃ Nanodomains Enable Efficient Near-Infrared Light-Emitting Diodes

Effect of sintering temperature on microstructure and electrical properties of Na_0.5Bi_0.47Sr_0.02TiO_3-δ ceramics