Kinetically-controlled intermediate-direct-pinning for homogeneous energy landscapes in quasi-two-dimensional perovskites for efficient and narrow blue emission

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 () and Tae-Woo Lee ()
Additional contact information
Joo Sung Kim: 1 Gwanak-ro Gwanak-gu
Hyeon-Dong Lee: 1 Gwanak-ro Gwanak-gu
Jeong Hyun Jung: 1 Gwanak-ro Gwanak-gu
Taehee Kim: Seodaemun-gu
Seung-Je Woo: 1 Gwanak-ro Gwanak-gu
Hyung Joong Yoon: Yuseong-gu
Jaehyun Moon: Yuseong-gu
Chan-mo Kang: Yuseong-gu
Seung-Eui Chang: 1 Gwanak-ro Gwanak-gu
Dong-Hyeok Kim: 1 Gwanak-ro Gwanak-gu
Sungjin Kim: 1 Gwanak-ro Gwanak-gu
Hoichang Yang: Michuhol-gu
Dongho Kim: Seodaemun-gu
Tae-Woo Lee: 1 Gwanak-ro Gwanak-gu

Nature Communications, 2025, vol. 16, issue 1, 1-11

Abstract: 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.

Date: 2025
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DOI: 10.1038/s41467-025-62863-y

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