journal article·2020-02Open access

Mixed Spacer Cation Stabilization of Blue‐Emitting n = 2 Ruddlesden–Popper Organic–Inorganic Halide Perovskite Films

Tik Lun Leung, Ho Won Tam, Fangzhou Liu, Jingyang Lin, Alan Man Ching Ng, Wai Kin Chan, Wei Chen, Zhubing He, Ivor Lončarić, Luca Grisanti, Chao Ma, Kam Sing Wong, Ying Suet Lau, Furong Zhu, Željko Skoko, Jasminka Popović, Aleksandra B. Djurišić

Advanced Optical Materials· Volume 8· Issue 4

Abstract

Abstract Ruddlesden–Popper halide perovskite (RPP) materials are of significant interest for light‐emitting devices since their emission wavelength can be controlled by tuning the number of layers n, resulting in improved spectral stability compared to mixed halide devices. However, RPP films typically contain phases with different n, and the low n phases tend to be unstable upon exposure to humidity, irradiation, and/or elevated temperature which hinders the achievement of pure blue emission from n = 2 films. In this work, two spacer cations are used to form an RPP film with mixed cation bilayer and high n = 2 phase purity, improved stability, and brighter light emission compared to a single spacer cation RPP. The stabilization of n = 2 phase is attributed to favorable formation energy, reduced strain, and reduced electron–phonon coupling compared to the RPP films with only one type of spacer cation. Using this approach, pure blue light‐emitting diodes (LEDs) with Commission Internationale de l'éclairage (CIE) coordinates of (0.156, 0.088) and excellent spectral stability are achieved.
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Research context

OpenAlex topics: Perovskite Materials and Applications · Organic Light-Emitting Diodes Research · Organic Electronics and Photovoltaics

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

Affiliations

Department of Physics The University of Hong Kong Pokfulam Road Hong Kong

Department of Physics Southern University of Science and Technology No. 1088, Xueyuan Road 518055 Shenzhen Guangdong China

Department of Chemistry The University of Hong Kong Pokfulam Road Hong Kong

Department of Materials Science and Engineering Shenzhen Key Laboratory of Full Spectral Solar Electricity Generation (FSSEG) Southern University of Science and Technology No. 1088, Xueyuan Road 518055 Shenzhen China

Division of Theoretical Physics Condensed Matter and Statistical Physics Group Ruđer Bošković Institute Bijenička 54 10000 Zagreb Croatia

Department of Physics The Hong Kong University of Science and Technology Clearwater Bay Hong Kong

Department of Physics Research Centre of Excellence for Organic Electronics and Institute of Advanced Materials Hong Kong Baptist University Kowloon Town Hong Kong

Department of Physics Faculty of Science University of Zagreb Bijenička 32 10000 Zagreb Croatia

Division of Materials Physics Laboratory for Synthesis and Crystallography of Functional Materials Ruđer Bošković Institute Bijenička 54 10000 Zagreb Croatia

Funding

European Regional Development Fund

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