Distribution control enables efficient reduced-dimensional perovskite LEDs

Dongxin Ma, Kebin Lin, Yitong Dong, Hitarth Choubisa, Andrew H. Proppe, Dan Wu, Ya-Kun Wang, Bin Chen, Peicheng Li, James Z. Fan, Fanglong Yuan, Andrew Johnston, Yuan Liu, Yuetong Kang, Zheng-Hong Lu, Zhanhua Wei () and Edward H. Sargent ()
Additional contact information
Dongxin Ma: University of Toronto
Kebin Lin: Huaqiao University
Yitong Dong: University of Toronto
Hitarth Choubisa: University of Toronto
Andrew H. Proppe: University of Toronto
Dan Wu: Shenzhen Technology University
Ya-Kun Wang: University of Toronto
Bin Chen: University of Toronto
Peicheng Li: University of Toronto
James Z. Fan: University of Toronto
Fanglong Yuan: University of Toronto
Yuan Liu: University of Toronto
Yuetong Kang: University of Victoria
Zheng-Hong Lu: University of Toronto
Zhanhua Wei: Huaqiao University
Edward H. Sargent: University of Toronto

Nature, 2021, vol. 599, issue 7886, 594-598

Abstract: Abstract Light-emitting diodes (LEDs) based on perovskite quantum dots have shown external quantum efficiencies (EQEs) of over 23% and narrowband emission, but suffer from limited operating stability1. Reduced-dimensional perovskites (RDPs) consisting of quantum wells (QWs) separated by organic intercalating cations show high exciton binding energies and have the potential to increase the stability and the photoluminescence quantum yield2,3. However, until now, RDP-based LEDs have exhibited lower EQEs and inferior colour purities4–6. We posit that the presence of variably confined QWs may contribute to non-radiative recombination losses and broadened emission. Here we report bright RDPs with a more monodispersed QW thickness distribution, achieved through the use of a bifunctional molecular additive that simultaneously controls the RDP polydispersity while passivating the perovskite QW surfaces. We synthesize a fluorinated triphenylphosphine oxide additive that hydrogen bonds with the organic cations, controlling their diffusion during RDP film deposition and suppressing the formation of low-thickness QWs. The phosphine oxide moiety passivates the perovskite grain boundaries via coordination bonding with unsaturated sites, which suppresses defect formation. This results in compact, smooth and uniform RDP thin films with narrowband emission and high photoluminescence quantum yield. This enables LEDs with an EQE of 25.6% with an average of 22.1 ±1.2% over 40 devices, and an operating half-life of two hours at an initial luminance of 7,200 candela per metre squared, indicating tenfold-enhanced operating stability relative to the best-known perovskite LEDs with an EQE exceeding 20%1,4–6.

Date: 2021
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DOI: 10.1038/s41586-021-03997-z

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