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Journal Article
Kinetically-controlled intermediate-directpinning for homogeneous energy landscapes in quasi-two-dimensional perovskites for efficient and narrow blue emission
- Authors
- Joo Sung Kim, Hyeon-Dong Lee, Jeong Hyun Jung, Taehee Kim, Seung-Je Woo, Hyung Joong Yoon, Jaehyun Moon, Chan-mo Kang, Seung-Eui Chang, Dong-Hyeok Kim, Sungjin Kim, Hoichang Yang, Dongho Kim, Tae-Woo Lee
- Issue Date
- 2025-10
- Citation
- Nature Communications, v.16, pp.1-11
- ISSN
- 2041-1723
- Publisher
- Springer Nature
- Language
- English
- Type
- Journal Article
- Abstract
- Quasi-two-dimensional perovskite structures hold great potential as active layers in blue perovskite light-emitting diodes. However, they face challenges of limited emission efficiency and broadened spectra due to phase inhomogeneity. Here, we report an intermediate-direct-pinning method to develop a uniform-phase quasi-two-dimensional structure with a homogeneous energy landscape. By forming a strong cation-π interaction complex, we stabilize a metastable intermediate phase with retarded crystallization toward low-n phases (n ≤ 3), followed by a direct pinning process favouring crystallization of medium-n phases (n = 4 and 5) without further broadening. Additionally, introducing a surface-anchoring ligand during the pinning process effectively suppresses non-radiative recombination. The resultant structure shows efficient sky-blue emission and narrow linewidth (108 meV). Devices fabricated with this structure reach a maximum external quantum efficiency of 22.5% at 489 nm, which is scalable to large-area (pixel size: 900 mm2) and passive matrix devices (30 × 10 arrays, active area = 200 μm × 600 μm). These findings highlight the potential of perovskite light-emitting diodes for full-colour displays.
- KSP Keywords
- Active Layer, Active area, Emission efficiency, Energy landscape, External Quantum Efficiency, Intermediate phase, Narrow Linewidth, Non-radiative recombination, Passive matrix, Perovskite structure, Phase inhomogeneity
This work is distributed under the term of Creative Commons License (CCL)
(CC BY)
(CC BY)
