Revealing the vertical structure of in-situ fabricated perovskite nanocrystals films toward efficient pure red light-emitting diodes

Wu, Xian‐gang; Sun, Shipei; Song, Tinglu; Zhang, Xin; Wang, Chenhui; Yang, Yingguo; Wang, Shuangpeng; Zhong, Haizheng

doi:10.1016/j.fmre.2022.05.004

Cited by 6 publications

(3 citation statements)

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“…[31,32] Thus, a series of phenylalkylammonium molecules were screened computationally with density functional theory (DFT) methods by their surface binding energies to CsPbI 3 and solvation energies in various organic solvents (the surface model of CsPbI 3 , binding energy calculation, and solvation simulation method are described in Notes S2 and S3 and Figure S2, Supporting Information). The results, which are shown in Figure S3, Supporting Information, clearly demonstrates the strong binding of 3,3-diphenylpropylammonium (DPAm + ) ligands-previously employed to bulk or quasi-2D perovskite systems and demonstrated promising optoelectronic performances [33][34][35] -to the CsPbI 3 perovskite surface (with the largest binding energy of −1.73 eV), with a significant portion of binding energy originating from the van der Waals interac-tion (−0.63 eV). Furthermore, DPAm also shows more or less similar solvation energies in toluene with the rest of aromatic ligands (≈−1.42 eV; Figure S4, Supporting Information).…”

Section: Resultsmentioning

confidence: 88%

A Universal Perovskite Nanocrystal Ink for High‐Performance Optoelectronic Devices

et al. 2022

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Semiconducting lead halide perovskite nanocrystals (PNCs) are regarded as promising candidates for next‐generation optoelectronic devices due to their solution processability and outstanding optoelectronic properties. While the field of light‐emitting diodes (LEDs) and photovoltaics (PVs), two prime examples of optoelectronic devices, has recently seen a multitude of efforts toward high‐performance PNC‐based devices, realizing both devices with high efficiencies and stabilities through a single PNC processing strategy has remained a challenge. In this work, diphenylpropylammonium (DPAI) surface ligands, found through a judicious ab‐initio‐based ligand search, are shown to provide a solution to this problem. The universal PNC ink with DPAI ligands presented here, prepared through a solution‐phase ligand‐exchange process, simultaneously allows single‐step processed LED and PV devices with peak electroluminescence external quantum efficiency of 17.00% and power conversion efficiency of 14.92% (stabilized output 14.00%), respectively. It is revealed that a careful design of the aromatic rings such as in DPAI is the decisive factor in bestowing such high performances, ease of solution processing, and improved phase stability up to 120 days. This work illustrates the power of ligand design in producing PNC ink formulations for high‐throughput production of optoelectronic devices; it also paves a path for “dual‐mode” devices with both PV and LED functionalities.

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Section: Resultsmentioning

confidence: 88%

A Universal Perovskite Nanocrystal Ink for High‐Performance Optoelectronic Devices

et al. 2022

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“…[1][2][3][4][5][6][7] Up to now, the external quantum efficiency (EQE) of PeLEDs has made remarkable progress, especially in nearinfrared and green devices, which have exceeded 20%. [8][9][10][11][12] However, the efficient emission in the pure red range (620-660 nm) is still a major challenge that limits the development of PeLEDs for display applications. 13,14 Compared with organicinorganic hybrid perovskites, the better chemical stability of allinorganic CsPbI 3 makes it an attractive class of material for long-term stable red PeLEDs.…”

Section: Introductionmentioning

confidence: 99%

Bandgap and dimension regulation of CsPbI₃ perovskite through a bromine-terminated ligand for efficient pure red electroluminescence

et al. 2022

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“…The pure-red perovskites are usually achieved by mixing the composition of halides (Br and I) . Although the mixed halide perovskites are easily available, their severe phase segregation under an electric field results in inferior spectral stability of PeLEDs. − …”

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confidence: 99%

High-Efficiency Pure-Red Perovskite Quantum-Dot Light-Emitting Diodes

et al. 2022

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It is still challenging to achieve high-efficiency pure-red (620–650 nm wavelength) perovskite light-emitting diodes (PeLEDs). Herein, we report pure-red PeLEDs with Commission Internationale de l’Eclairage coordinates (0.703, 0.297) meeting the Rec. 2020, an external quantum efficiency of 20.8%, and a luminance of 3775 cd/m2. This design is based on the strong quantum confinement CsPbI3 quantum dots (QDs) capped by composite ligands of 3-phenyl-1-propylamine and tetrabutylammonium iodide. This strategy stabilized the structure of the strong-confined QDs and reduced the influence of the electric field-induced Stark effect on the PeLEDs. Furthermore, the exciton binding energy of the QDs was decreased by the composited ligands to suppress Auger recombination within the devices. Additionally, the valence-band maximum of the QDs was lifted to match the hole-transport layer, thus balancing charge injection in the PeLEDs. Our device also demonstrated a stable electroluminescence spectrum and a lifetime of 5.6 times longer than the control device.

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Revealing the vertical structure of in-situ fabricated perovskite nanocrystals films toward efficient pure red light-emitting diodes

Cited by 6 publications

References 50 publications

A Universal Perovskite Nanocrystal Ink for High‐Performance Optoelectronic Devices

A Universal Perovskite Nanocrystal Ink for High‐Performance Optoelectronic Devices

Bandgap and dimension regulation of CsPbI₃ perovskite through a bromine-terminated ligand for efficient pure red electroluminescence

High-Efficiency Pure-Red Perovskite Quantum-Dot Light-Emitting Diodes

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Revealing the vertical structure of in-situ fabricated perovskite nanocrystals films toward efficient pure red light-emitting diodes

Cited by 6 publications

References 50 publications

A Universal Perovskite Nanocrystal Ink for High‐Performance Optoelectronic Devices

A Universal Perovskite Nanocrystal Ink for High‐Performance Optoelectronic Devices

Bandgap and dimension regulation of CsPbI3 perovskite through a bromine-terminated ligand for efficient pure red electroluminescence

High-Efficiency Pure-Red Perovskite Quantum-Dot Light-Emitting Diodes

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Bandgap and dimension regulation of CsPbI₃ perovskite through a bromine-terminated ligand for efficient pure red electroluminescence