Bidentate Ligand Engineering of Red Perovskites for Efficient Exciton Transfer and Lattice Rigidity
Journal
ACS Applied Materials and Interfaces
Journal Volume
18
Journal Issue
31
Start Page
42902
End Page
42913
ISSN
1944-8244
1944-8252
Date Issued
2026-08-12
Author(s)
Yan, Zhen-Li
Yang, Ching-Wei
Huang, Yu-Xuan
Wu, Chien-Hsin
Huang, Ying-Chi
Lin, Bi-Hsuan
Benas, Jean-Sebastien
Lin, Ja-Hon
Adachi, Chihaya
Kuo, Chi-Ching
Abstract
Bidentate ligand engineering provides a versatile strategy to regulate crystallization and lattice dynamics in metal halide perovskites. Herein, a bidentate malonamide ligand, butyl-malonamide-phenylene (Bi-BMP), is incorporated into red 2D/quasi-2D/3D perovskites (PVSK) to construct efficient exciton-funneling channels and enhance crystal rigidity. The malonamide groups form strong dipole–ion coordination with Pb2+, promoting uniform phase growth and balanced dimensional distribution, while the rigid phenylene backbone suppresses thermal lattice expansion and field-induced distortion. These dual functions yield reduced exciton–phonon coupling (γLO = 130 meV) and suppressed nonradiative recombination, resulting in a sixfold enhancement of solid-film PLQY (26.9%). Consequently, Bi-BMP@PVSK devices achieve an EQE of ≈14%, a tenfold longer operational lifetime, and color-pure red emission (CIE 0.623, 0.260) approaching the Rec. 2020 standard. This dual-functional molecular design establishes a general strategy for highly efficient and durable red PeLEDs.
Subjects
bidentate ligand engineering
dipole–ion interaction
exciton funneling
lattice rigidity
perovskite light-emitting diodes
Publisher
American Chemical Society (ACS)
Type
journal article