Multiple Phase Regulation Enables Efficient and Bright Quasi-2D Perovskite Light-Emitting Diodes

Liu, Anqi; Lu, Po; Lu, Min; Chai, Xiaomei; Liu, Yu; Guan, Gangyun; Gao, Yanbo; Wu, Zhennan; Bai, Xue; Hu, Junhua; Wang, Dingdi; Zhang, Yu

doi:10.1021/acs.nanolett.3c03440

Cited by 21 publications

(9 citation statements)

References 46 publications

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“…In contrast, too short (110) Bragg scattering arcs appear after incorporation of 3-BAS, suggesting the well-oriented distribution of perovskite layers (n ≥ 4) for the targeted perovskite film. [38][39][40] Furthermore, the targeted perovskites film exhibits much weaker diffraction patterns at q xy ¼ 0.36 Å −1 and q xy ¼ 0.92 Å −1 (Fig. S11 in the Supplementary Material), indicating that 3-BAS can inhibit the formation of small-n phases during the perovskite crystallization.…”

Section: Resultsmentioning

confidence: 99%

High performance and stable pure-blue quasi-2D perovskite light-emitting diodes by multifunctional zwitterionic passivation engineering

Shen,

Fang,

Zhang

et al. 2024

Adv. Photon.

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Despite the rapid advances of red and green perovskite light-emitting diodes (PeLEDs), achieving high brightness with high external quantum efficiency (EQE) remains a challenge for the pure-blue PeLEDs, which greatly hinders their practical applications, such as white-light illumination and in optical communication as a high-speed and low-loss light source. Herein, we report a high-performance pure-blue PeLED based on mixed-halide quasi-2D perovskites incorporated with a zwitterionic molecule of 3-(benzyldimethylammonio) propanesulfonate (3-BAS). Experimental and density functional theory analysis reveals that 3-BAS can simultaneously eliminate non-radiative recombination loss, suppress halide migration, and regulate phase distribution for smoothing energy transfer in the mixed-halide quasi-2D perovskites, leading to the final perovskites with high photoluminescence quantum yield and robust spectrum stability. Thus, the highperformance pure-blue PeLED with a recorded brightness with 1806 cd m −2 and a relative higher EQE of 9.25% is achieved, which is successfully demonstrated in a visible light communication system for voice signal transmission. We pave the way for achieving highly efficient pure-blue PeLEDs with great application potential in future optical communication networks.

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Section: Resultsmentioning

confidence: 99%

High performance and stable pure-blue quasi-2D perovskite light-emitting diodes by multifunctional zwitterionic passivation engineering

Shen,

Fang,

Zhang

et al. 2024

Adv. Photon.

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“…To address this existing gap, we introduce an effective surface engineering of (OAm) 2 (MAPbI 3 ) 2 PbI 4 NPl [OAm stands for oleylammonium ion, MA stands for CH 3 NH 3 + ] through the incorporation of a more reactive ammonium functionality distinct from the parental ammonium ions (MA, OAm). Recently, the perovskite community has witnessed an impressive increase of optoelectronic performance, − controlling phase purity in RP perovskite by utilizing fluoro-derivatives. In the present study, we utilized 4-fluorobenzylammonium iodide (4FBAI) as the reactive ammonium additive for the purpose.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Photostability of the Colloidal Ruddlesden–Popper Perovskite Nanoplate through 4-Fluorobenzylammonium Iodide-Mediated Surface Engineering for Photoluminescent Application

Sen,

Sarkar,

Sen

2024

ACS Appl. Nano Mater.

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UV light-induced photodegradation of the organic− inorganic hybrid (OIH) Ruddlesden−Popper (RP) perovskite nanoplates (NPls) is a crucial bottleneck for optoelectronic application in the future. Continuous UV exposure triggers the deprotonation of the spacer as well as the A-site cation (CH 3 NH 3 + ), ultimately leading to lattice collapse. To combat this photoinstability, we introduce a surface modification of colloidal OIH RP NPls, (OAm) 2 (CH 3 NH 3 PbI 3 ) 2 PbI 4 (n = 3) (OAm stands for oleylammonium cation) by 4-fluorobenzylammonium iodide (4FBAI). In ambient conditions, conventional NPls deteriorate within 80 min of UV exposure, whereas the 4FBAImodified NPls exhibit remarkable endurance, maintaining structural integrity for 12 h with only a 11% reduction in the initial photoluminescence (PL). Interestingly, benzylammonium iodide (BAI) and 4-methoxybenzylammonium iodide (4OBAI)-treated NPl fail to provide similar photostability, thus signifying the importance of the fluorine atom. The fluorine atom enhances the positive charge density of the ammonium ion and facilitates faster deprotonation compared to parental ammonium ions (here, OAm + and CH 3 NH 3 + ) under UV exposure. This ensures the survival of the parent nanoplate structure. Along with the photostability enhancement, the PL quantum yield of the treated NPl also increases to 50 ± 2 from 35 ± 2%. This research not only addresses the pressing photostability issue of RP NPl stability but also illuminates the pivotal role of specific chemical modifications, such as fluorine atom incorporation, for the fabrication of UV-stable perovskite devices in the future.

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“…As shown in Figure d, the conductivities of the MAC, 2PACz, and target perovskite films are 1.81 × 10 –2 , 3.02 × 10 –2 , and 4.41 × 10 –2 S cm –1 , respectively, which are higher than that of the pristine perovskite film (1.35 × 10 –2 S cm –1 ). On further analysis of the electrical properties of the films, the enhancement of the conductivity may come from the change of phase distribution and film orientation. − The pristine and target sample films were characterized by grazing-incidence wide-angle X-ray scattering (GIWAXs), and it was found that the small n -phases were significantly reduced and the films showed a more ordered orientation (Figure S11). Both the reduction of small n -phases that are not conducive to conductivity and the preferential orientation crystallization can effectively enhance the carrier injection and transport to enhance the electrical conductivity of the films. , Moreover, atomic force microscopye (AFM) and laser scanning confocal microscopy (LSCM) were used to probe the effects of MAC, 2PACz, and target on the surface flatness and emitting uniformity of the films.…”

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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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Multiple Phase Regulation Enables Efficient and Bright Quasi-2D Perovskite Light-Emitting Diodes

Cited by 21 publications

References 46 publications

High performance and stable pure-blue quasi-2D perovskite light-emitting diodes by multifunctional zwitterionic passivation engineering

High performance and stable pure-blue quasi-2D perovskite light-emitting diodes by multifunctional zwitterionic passivation engineering

Enhanced Photostability of the Colloidal Ruddlesden–Popper Perovskite Nanoplate through 4-Fluorobenzylammonium Iodide-Mediated Surface Engineering for Photoluminescent Application

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

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