Tin-Based Multiple Quantum Well Perovskites for Light-Emitting Diodes with Improved Stability

Wang, Ying; Zou, Renmeng; Chang, Jin; Fu, Zewu; Cao, Yu; Zhang, Liangdong; Wei, Yingqiang; Kong, Decheng; Zou, Wei; Wen, Kaichuan; Fan, Na; Wang, Nana; Huang, Wei; Wang, Jianpu

doi:10.1021/acs.jpclett.8b03700

Cited by 78 publications

(81 citation statements)

References 34 publications

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“…Third, high performance nontoxic perovskite emitters with different colors are lacking. The MQW perovskite has shown prospect to enhance the performance of Sn‐based NIR perovskite LEDs . However, both the PLQE and charge transport of Sn perovskites are much inferior than the Pb perovskites.…”

Section: Discussionmentioning

confidence: 99%

Multiple‐Quantum‐Well Perovskites for High‐Performance Light‐Emitting Diodes

et al. 2019

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3D organometal halide perovskite. [2] Due to the poor film morphology and strong trap-assisted nonradiative recombination, the device performance is modest, with a peak EQE of 0.76%. Many methods, including interfacial engineering, polymer additive, and antisolvent, have been used to improve the quality of perovskite films. [3,[13][14][15] However, due to the serious trap-assisted nonradiative recombination, the photoluminescence quantum efficiencies (PLQEs) of 3D perovskites at low excitations are quite low, limiting the further improvement of device performance.The emerged multiple-quantum-well (MQW) perovskite has the merits of good film morphology and high PLQE, which is promising to achieve high performance LEDs. The MQW perovskite can be defined as quasi-2D layered perovskite, which is composed of different layered perovskites with naturally formed quantum wells (QWs) (Figure 1). [16][17][18] Generally, the layered perovskite has a formula of L 2 (SMX 3 ) n−1 MX 4 , where L is the large organic cation, S is the small monovalent cation, M is the divalent metal cation, X is the halide anion, and n is the number of MX 4 2− sheets. [19][20][21] In layered perovskites, the MX 4 2− sheet acts as potential well and its number, n, determines well width and the bandgap, while the large organic layer acts as potential barrier and its ionic radius determines the barrier width. It was found that quasi-2D layered perovskite thin film can spontaneously form MQW structure by spin-coating process, which is a mixture of layered perovskites with different n numbers and different bandgaps. [16] The energy transfer process from large bandgap QWs to small bandgap QWs is fast and efficient, resulting in carrier localization and accumulation in low energy QWs. [16,18] Consequently, trap-induced nonradiative recombination can be suppressed and high PLQE can be obtained. Based on the MQWs, the EQE of perovskite LEDs first reaches >10% in 2016. [16,22] Recently, through further suppressing nonradiative recombination and enhancing outcoupling by polymer additive, the peak EQE of near-infrared (NIR) perovskite LEDs based on MQWs has reached 20%. [7] Here, we focus on the unique properties of MQW perovskite and address its potential for high performance LEDs. We then discuss how to control the MQW structure and its effect on perovskite LED performance. Why MQW Perovskites are Promising for High Performance LEDsFor perovskite LEDs, the EQE is intrinsically limited by the properties of perovskite film, which also determine the stability Light-emitting diodes (LEDs) based on solution-processed metal halide perovskites have shown great application potential in energy-efficient lighting and displays. Multiple-quantum-well (MQW) perovskites simultaneously possess high photoluminescence quantum efficiency and good film morphology and stability, making it attractive for high-performance perovskite LEDs. Here, merits of MQW perovskites and the progress in MQW perovskite LEDs are reviewed. Challenges and future directions of perovskite LEDs are ...

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Section: Discussionmentioning

confidence: 99%

Multiple‐Quantum‐Well Perovskites for High‐Performance Light‐Emitting Diodes

et al. 2019

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Section: Led Applicationsmentioning

confidence: 99%

Lead‐Free Halide Perovskites for Light Emission: Recent Advances and Perspectives

Gao

Zhang³

et al. 2021

Advanced Science

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Lead‐based halide perovskites have received great attention in light‐emitting applications due to their excellent properties, including high photoluminescence quantum yield (PLQY), tunable emission wavelength, and facile solution preparation. In spite of excellent characteristics, the presence of toxic element lead directly obstructs their further commercial development. Hence, exploiting lead‐free halide perovskite materials with superior properties is urgent and necessary. In this review, the deep‐seated reasons that benefit light emission for halide perovskites, which help to develop lead‐free halide perovskites with excellent performance, are first emphasized. Recent advances in lead‐free halide perovskite materials (single crystals, thin films, and nanocrystals with different dimensionalities) from synthesis, crystal structures, optical and optoelectronic properties to applications are then systematically summarized. In particular, phosphor‐converted LEDs and electroluminescent LEDs using lead‐free halide perovskites are fully examined. Ultimately, based on current development of lead‐free halide perovskites, the future directions of lead‐free halide perovskites in terms of materials and light‐emitting devices are discussed.

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“…[ 18 ] However, Sn‐based perovskites suffer ready oxidation of Sn 2+ to Sn 4+ , leaving undesired Sn 2+ vacancies that act as nonradiative recombination centers and quench emission. [ 19,20 ] As a result, there is thus far only one report on PSI LEDs: the device exhibited a low luminance of 0.15 cd m −2 , with an EQE that was not measurable. [ 21 ]…”

Section: Figurementioning

confidence: 99%

High Color Purity Lead‐Free Perovskite Light‐Emitting Diodes via Sn Stabilization

et al. 2020

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displays. [1,2] In particular, perovskite-based light-emitting diodes (PeLEDs) with superior external quantum efficiency (EQE) and luminance have been demonstrated in the green, red, and near-infrared emission regions. [3][4][5][6] As display technologies continue to improve, the requirements for the emitters in the display become more stringent. As of August 2012, the Rec. 2020 standard defines the display color gamut for ultrahigh definition television (UHDTV): it requires each of the primary red, green, blue (RGB) emitters to have a precisely defined wavelength (red: 630 nm, green: 532 nm, and blue: 467 nm) and a narrow emission linewidth (<20 nm). [7] In state-of-art liquid crystal display backlights, crosstalk between color filters reduces the color purity of the RGB primaries. [8] LED displays do not require color filters and as such are promising candidate for UHDTV. Organic molecules have had success in commercial LED displays, but the wide linewidths (>50 nm) of organic emitters limit the attainable color gamut. [9] Developing emitters with precisely defined emission profiles for displays is an active Perovskite-based light-emitting diodes (PeLEDs) are now approaching the upper limits of external quantum efficiency (EQE); however, their application is currently limited by reliance on lead and by inadequate color purity. The Rec. 2020 requires Commission Internationale de l'Eclairage coordinates of (0.708, 0.292) for red emitters, but present-day perovskite devices only achieve (0.71, 0.28). Here, lead-free PeLEDs are reported with color coordinates of (0.706, 0.294)-the highest purity reported among red PeLEDs. The variation of the emission spectrum is also evaluated as a function of temperature and applied potential, finding that emission redshifts by <3 nm under low temperature and by <0.3 nm V −1 with operating voltage. The prominent oxidation pathway of Sn is identified and this is suppressed with the aid of H 3 PO 2 . This strategy prevents the oxidation of the constituent precursors, through both its moderate reducing properties and through its forming complexes with the perovskite that increase the energetic barrier toward Sn oxidation. The H 3 PO 2 additionally seeds crystal growth during film formation, improving film quality. PeLEDs are reported with an EQE of 0.3% and a brightness of 70 cd m −2 ; this is the record among reported red-emitting, lead-free PeLEDs.

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Tin-Based Multiple Quantum Well Perovskites for Light-Emitting Diodes with Improved Stability

Cited by 78 publications

References 34 publications

Multiple‐Quantum‐Well Perovskites for High‐Performance Light‐Emitting Diodes

Multiple‐Quantum‐Well Perovskites for High‐Performance Light‐Emitting Diodes

Lead‐Free Halide Perovskites for Light Emission: Recent Advances and Perspectives

High Color Purity Lead‐Free Perovskite Light‐Emitting Diodes via Sn Stabilization

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