Interfacial Decoupling Layer Enabled Low-<i>n</i> Phase Enrichment for Blue Quasi-2D Perovskites
The random n-monolayer phase distributions and impurity phases impose challenges to achieving blue-emission quasi-2D perovskite light emitting diodes (PeLEDs), and their formation mechanism is unclear. Here, we uncover the reasons behind the phase formation and distribution in blue-emission quasi-2D perovskites by probing into the molecular interactions at the buried interface between substrates and perovskites and propose a mechanistic model to depict the film formation process. Furthermore, an interfacial decoupling layer, perfluorinated ionomer, was employed to successfully mitigate the negative impact of substrates on the phase formation and distribution of blue-emission quasi-2D perovskites, resulting in an ordered phase distribution and a reduction of undesired phases. Besides, this interfacial layer effectively suppressed the nonradiative recombination losses, leading to enhanced photoluminescence quantum yield from 12.71% to 60.13% and notable blue shift (∼10 nm) even without incorporating Cl ions. As a result, blue PeLEDs based on this strategy achieved an external quantum efficiency reaching 12.09%.
Authors
- Jeong‐Yun Sun (ORCID: https://orcid.org/0000-0002-7276-1947)
- Qingsen Zeng (ORCID: https://orcid.org/0000-0002-0877-0814)
- Seung Hyeon Jo
- Min‐Jun Sung
- Tae‐Woo Lee (ORCID: https://orcid.org/0000-0002-6449-6725)
- Jie Dong (ORCID: https://orcid.org/0000-0001-8305-0828)
- Kyung Yeon Jang (ORCID: https://orcid.org/0000-0002-4911-3407)
- Hao Chen (ORCID: https://orcid.org/0000-0003-3759-8352)
- Kayoung Cho (ORCID: https://orcid.org/0009-0005-1739-5330)
- Huanyu Zhou (ORCID: https://orcid.org/0000-0002-4274-5540)
- Hyeon‐Dong Lee
- Jae‐Man Park (ORCID: https://orcid.org/0000-0002-8225-6602)
- Chan‐Yul Park (ORCID: https://orcid.org/0009-0005-9761-9604)
- Joo Sung Kim (ORCID: https://orcid.org/0000-0002-7465-3085)
- Jaehong Park (ORCID: https://orcid.org/0000-0002-0509-3934)
- Dandan Song (ORCID: https://orcid.org/0000-0002-5050-8211)
- Jae‐Woo Jung (ORCID: https://orcid.org/0000-0002-3411-735X)
- S. Chang (ORCID: https://orcid.org/0009-0004-5554-0626)
- Wenqiang Yang
- E. Yoon (ORCID: https://orcid.org/0009-0007-1895-6042)
- Tingyu Long
- Hyeree Kim
- Xin Zhang (ORCID: https://orcid.org/0009-0003-3247-9255)
Institutions
- Ewha Womans University (KR)
- Seoul National University (KR)
- Beijing Jiaotong University (CN)
- Suzhou Vocational University (CN)
- University of Chinese Academy of Sciences (CN)
- Beihang University (CN)
Publication Details
- Journal
- ACS Energy Letters
- Published
- 2024-11-18
- DOI
- https://doi.org/10.1021/acsenergylett.4c02351
- Citations
- 5
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 1.04
Funders
- National Research Foundation of Korea