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Suppressing phase disproportionation in quasi-2D perovskite light-emitting diodes.
Wang, Kang; Lin, Zih-Yu; Zhang, Zihan; Jin, Linrui; Ma, Ke; Coffey, Aidan H; Atapattu, Harindi R; Gao, Yao; Park, Jee Yung; Wei, Zitang; Finkenauer, Blake P; Zhu, Chenhui; Meng, Xiangeng; Chowdhury, Sarah N; Chen, Zhaoyang; Terlier, Tanguy; Do, Thi-Hoai; Yao, Yan; Graham, Kenneth R; Boltasseva, Alexandra; Guo, Tzung-Fang; Huang, Libai; Gao, Hanwei; Savoie, Brett M; Dou, Letian.
Affiliation
  • Wang K; Davidson School of Chemical Engineering, Purdue University, West Lafayette, IN, USA.
  • Lin ZY; Davidson School of Chemical Engineering, Purdue University, West Lafayette, IN, USA.
  • Zhang Z; Department of Physics, Florida State University, Tallahassee, FL, USA.
  • Jin L; Department of Chemistry, Purdue University, West Lafayette, IN, USA.
  • Ma K; Davidson School of Chemical Engineering, Purdue University, West Lafayette, IN, USA.
  • Coffey AH; Davidson School of Chemical Engineering, Purdue University, West Lafayette, IN, USA.
  • Atapattu HR; Department of Chemistry, University of Kentucky, Lexington, KY, USA.
  • Gao Y; Davidson School of Chemical Engineering, Purdue University, West Lafayette, IN, USA.
  • Park JY; Davidson School of Chemical Engineering, Purdue University, West Lafayette, IN, USA.
  • Wei Z; Davidson School of Chemical Engineering, Purdue University, West Lafayette, IN, USA.
  • Finkenauer BP; Davidson School of Chemical Engineering, Purdue University, West Lafayette, IN, USA.
  • Zhu C; Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, USA.
  • Meng X; School of Materials Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, China.
  • Chowdhury SN; Birck Nanotechnology Center, Purdue University, West Lafayette, IN, USA.
  • Chen Z; Department of Electrical and Computer Engineering and Texas Center for Superconductivity at the University of Houston (TcSUH), University of Houston, Houston, TX, USA.
  • Terlier T; SIMS laboratory, Shared Equipment Authority, Rice University, Houston, TX, USA.
  • Do TH; Department of Photonics, National Cheng Kung University, Tainan, Taiwan.
  • Yao Y; Department of Electrical and Computer Engineering and Texas Center for Superconductivity at the University of Houston (TcSUH), University of Houston, Houston, TX, USA.
  • Graham KR; Department of Chemistry, University of Kentucky, Lexington, KY, USA.
  • Boltasseva A; Birck Nanotechnology Center, Purdue University, West Lafayette, IN, USA.
  • Guo TF; Department of Photonics, National Cheng Kung University, Tainan, Taiwan.
  • Huang L; Department of Chemistry, Purdue University, West Lafayette, IN, USA.
  • Gao H; Department of Physics, Florida State University, Tallahassee, FL, USA.
  • Savoie BM; Davidson School of Chemical Engineering, Purdue University, West Lafayette, IN, USA.
  • Dou L; Davidson School of Chemical Engineering, Purdue University, West Lafayette, IN, USA. dou10@purdue.edu.
Nat Commun ; 14(1): 397, 2023 Jan 25.
Article in En | MEDLINE | ID: mdl-36693860
Electroluminescence efficiencies and stabilities of quasi-two-dimensional halide perovskites are restricted by the formation of multiple-quantum-well structures with broad and uncontrollable phase distributions. Here, we report a ligand design strategy to substantially suppress diffusion-limited phase disproportionation, thereby enabling better phase control. We demonstrate that extending the π-conjugation length and increasing the cross-sectional area of the ligand enables perovskite thin films with dramatically suppressed ion transport, narrowed phase distributions, reduced defect densities, and enhanced radiative recombination efficiencies. Consequently, we achieved efficient and stable deep-red light-emitting diodes with a peak external quantum efficiency of 26.3% (average 22.9% among 70 devices and cross-checked) and a half-life of ~220 and 2.8 h under a constant current density of 0.1 and 12 mA/cm2, respectively. Our devices also exhibit wide wavelength tunability and improved spectral and phase stability compared with existing perovskite light-emitting diodes. These discoveries provide critical insights into the molecular design and crystallization kinetics of low-dimensional perovskite semiconductors for light-emitting devices.

Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Nat Commun Journal subject: BIOLOGIA / CIENCIA Year: 2023 Document type: Article Affiliation country: United States Country of publication: United kingdom

Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Nat Commun Journal subject: BIOLOGIA / CIENCIA Year: 2023 Document type: Article Affiliation country: United States Country of publication: United kingdom