Journal ArticleDOI
Perovskite light-emitting diodes with external quantum efficiency exceeding 20 per cent
Kebin Lin,Jun Xing,Li Na Quan,F. Pelayo García de Arquer,Xiwen Gong,Jianxun Lu,Liqiang Xie,Weijie Zhao,Di Zhang,Chuanzhong Yan,Wenqiang Li,Xinyi Liu,Yan Lu,Jeffrey Kirman,Edward H. Sargent,Qihua Xiong,Zhanhua Wei +16 more
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TLDR
In this article, the authors describe visible-light-emitting perovskite LEDs that surpass the quantum efficiency milestone of 20.3 per cent, which is achieved by a new strategy for managing the compositional distribution in the device.Abstract:
Metal halide perovskite materials are an emerging class of solution-processable semiconductors with considerable potential for use in optoelectronic devices1–3. For example, light-emitting diodes (LEDs) based on these materials could see application in flat-panel displays and solid-state lighting, owing to their potential to be made at low cost via facile solution processing, and could provide tunable colours and narrow emission line widths at high photoluminescence quantum yields4–8. However, the highest reported external quantum efficiencies of green- and red-light-emitting perovskite LEDs are around 14 per cent7,9 and 12 per cent8, respectively—still well behind the performance of organic LEDs10–12 and inorganic quantum dot LEDs13. Here we describe visible-light-emitting perovskite LEDs that surpass the quantum efficiency milestone of 20 per cent. This achievement stems from a new strategy for managing the compositional distribution in the device—an approach that simultaneously provides high luminescence and balanced charge injection. Specifically, we mixed a presynthesized CsPbBr3 perovskite with a MABr additive (where MA is CH3NH3), the differing solubilities of which yield sequential crystallization into a CsPbBr3/MABr quasi-core/shell structure. The MABr shell passivates the nonradiative defects that would otherwise be present in CsPbBr3 crystals, boosting the photoluminescence quantum efficiency, while the MABr capping layer enables balanced charge injection. The resulting 20.3 per cent external quantum efficiency represents a substantial step towards the practical application of perovskite LEDs in lighting and display. A strategy for managing the compositional distribution in metal halide perovskite light-emitting diodes enables them to surpass 20% external quantum efficiency—a step towards their practical application in lighting and displays.read more
Citations
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Journal ArticleDOI
Molecular engineering towards efficientwhite-light-emitting perovskite.
Mingming Zhang,Lili Zhao,Jiahao Xie,Qian Zhang,Xiaoyu Wang,Najma Yaqoob,Zhengmao Yin,Payam Kaghazchi,San Zhang,Hua Li,Chunfeng Zhang,Lei Wang,Lijun Zhang,Weigao Xu,Jun Xing +14 more
TL;DR: An atom-substituting strategy to trigger STEs formation in layered perovskites is reported, and a joint experiment-theory study provides insights into the STE formation in perovSKites and will benefit tailoring white perovSkites with boosting performance.
Journal ArticleDOI
Direct emission from quartet excited states triggered by upconversion phenomena in solid-phase synthesized fluorescent lead-free organic–inorganic hybrid compounds
TL;DR: In this article, the solid-phase synthesis of two lead-free, zero-dimensional (0D) fluorescent organic-inorganic hybrid compounds, [Bu4N]2[MnBr4] (1) and [Ph4P]2][mbr4](2), achieved by grinding the organic and inorganic precursor salts.
Journal ArticleDOI
Carbon Nanoparticles as Versatile Auxiliary Components of Perovskite-Based Optoelectronic Devices
Journal ArticleDOI
Thermal and Humidity Stability of Mixed Spacer Cations 2D Perovskite Solar Cells.
TL;DR: The complementary humidity and thermal stability are obtained, which are ascribed to the enhanced interlayer interaction by BDA2+ and improved moisture resistance by the hydrophobic group of PEA+.
Journal ArticleDOI
Picosecond electron trapping limits the emissivity of CsPbCl3 perovskite nanocrystals
Runchen Lai,Kaifeng Wu +1 more
TL;DR: A side-by-side comparison between as-prepared and treated CsPbCl3 NCs using transient absorption and time-resolved PL measurements of sub-ps time resolution clearly identifies ps electron trapping as the dominant channel impairing the photoluminescence quantum yield (PL QY) of as- prepared CspbCl 3 NCs.
References
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Journal ArticleDOI
Nanocrystals of Cesium Lead Halide Perovskites (CsPbX3, X = Cl, Br, and I): Novel Optoelectronic Materials Showing Bright Emission with Wide Color Gamut
Loredana Protesescu,Loredana Protesescu,Sergii Yakunin,Sergii Yakunin,Maryna I. Bodnarchuk,Maryna I. Bodnarchuk,Franziska Krieg,Franziska Krieg,Riccarda Caputo,Christopher H. Hendon,Ruo Xi Yang,Aron Walsh,Maksym V. Kovalenko,Maksym V. Kovalenko +13 more
TL;DR: The compelling combination of enhanced optical properties and chemical robustness makes CsPbX3 nanocrystals appealing for optoelectronic applications, particularly for blue and green spectral regions (410–530 nm), where typical metal chalcogenide-based quantum dots suffer from photodegradation.
Journal ArticleDOI
Iodide management in formamidinium-lead-halide–based perovskite layers for efficient solar cells
Woon Seok Yang,Byung-wook Park,Eui Hyuk Jung,Nam Joong Jeon,Young Chan Kim,Dong Uk Lee,Seong Sik Shin,Jangwon Seo,Eun Kyu Kim,Jun Hong Noh,Sang Il Seok +10 more
TL;DR: The introduction of additional iodide ions into the organic cation solution, which is used to form the perovskite layers through an intramolecular exchanging process, decreases the concentration of deep-level defects, enabling the fabrication of PSCs with a certified power conversion efficiency.
Journal ArticleDOI
Bright light-emitting diodes based on organometal halide perovskite
Zhi-Kuang Tan,Reza Saberi Moghaddam,May Ling Lai,Pablo Docampo,Ruben Higler,Felix Deschler,Michael Price,Aditya Sadhanala,Luis M. Pazos,Dan Credgington,Fabian C. Hanusch,Thomas Bein,Henry J. Snaith,Richard H. Friend +13 more
TL;DR: It is shown, using photoluminescence studies, that radiative bimolecular recombination is dominant at higher excitation densities, Hence, the quantum efficiencies of the perovskite light-emitting diodes increase at higher current densities.
Journal ArticleDOI
Incorporation of rubidium cations into perovskite solar cells improves photovoltaic performance
Michael Saliba,Taisuke Matsui,Taisuke Matsui,Konrad Domanski,Ji-Youn Seo,Amita Ummadisingu,Shaik M. Zakeeruddin,Juan-Pablo Correa-Baena,Wolfgang Tress,Antonio Abate,Anders Hagfeldt,Michael Grätzel +11 more
TL;DR: This work shows that the small and oxidation-stable rubidium cation (Rb+) can be embedded into a “cation cascade” to create perovskite materials with excellent material properties and achieved stabilized efficiencies of up to 21.6% on small areas.
Journal ArticleDOI
Overcoming the electroluminescence efficiency limitations of perovskite light-emitting diodes.
Himchan Cho,Su Hun Jeong,Min-Ho Park,Young-Hoon Kim,Christoph Wolf,Chang-Lyoul Lee,Jin Hyuck Heo,Aditya Sadhanala,NoSoung Myoung,Seunghyup Yoo,Sang Hyuk Im,Richard H. Friend,Tae-Woo Lee +12 more
TL;DR: Efficient organic-inorganic perovskite light-emitting diodes were made with nanograin crystals that lack metallic lead, which helped to confine excitons and avoid their quenching.