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journal article·2021-12Open access

Spacer Cation Alloying in Ruddlesden–Popper Perovskites for Efficient Red Light‐Emitting Diodes with Precisely Tunable Wavelengths

Jian Qing, Sankaran Ramesh, Qiang Xu, Xiao‐Ke Liu, Heyong Wang, Zhongcheng Yuan, Zhan Chen, Lintao Hou, Tze Chien Sum, Feng Gao

Advanced Materials· Volume 33· Issue 49
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Source abstract

Abstract

Abstract Perovskite light‐emitting diodes (PeLEDs) have recently shown significant progress with external quantum efficiencies (EQEs) exceeding 20%. However, PeLEDs with pure‐red (620−660 nm) light emission, an essential part for full‐color displays, remain a great challenge. Herein, a general approach of spacer cation alloying is employed in Ruddlesden–Popper perovskites (RPPs) for efficient red PeLEDs with precisely tunable wavelengths. By simply tuning the alloying ratio of dual spacer cations, the thickness distribution of quantum wells in the RPP films can be precisely modulated without deteriorating their charge‐transport ability and energy funneling processes. Consequently, efficient PeLEDs with tunable emissions between pure red (626 nm) and deep red (671 nm) are achieved with peak EQEs up to 11.5%, representing the highest values among RPP‐based pure‐red PeLEDs. This work opens a new route for color tuning, which will spur future developments of pure‐red or even pure‐blue PeLEDs with high performance.
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Research context

Metals & alloysElectronic materials

OpenAlex topics: Perovskite Materials and Applications · Organic Light-Emitting Diodes Research · Quantum Dots Synthesis And Properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Siyuan Laboratory Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials Department of Physics Jinan University Guangzhou Guangdong 510632 P. R. China

Department of Physics, Chemistry, and Biology (IFM) Linköping University Linköping SE‐58183 Sweden

Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore

Energy Research Institute @NTU (ERI@N) Interdisciplinary Graduate Programme Nanyang Technological University 50 Nanyang Avenue, S2‐B3a‐01 Singapore 639798 Singapore

Funding

Vetenskapsrådet · Swedish Foundation for International Cooperation in Research and Higher Education · Nanyang Technological University · Ministry of Education · China Postdoctoral Science Foundation · Fundamental Research Funds for the Central Universities · FP7 Ideas: European Research Council

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