Enabling AC electroluminescence in quasi-2D perovskites by uniformly arranging different-n-value nanoplates to allow bidirectional charge transport

Zhang, Jia; Tsai, Hsinhan; Nie, Wanyi; Hu, Bin

doi:10.1016/j.nanoen.2020.105413

Enabling AC electroluminescence in quasi-2D perovskites by uniformly arranging different-n-value nanoplates to allow bidirectional charge transport

Journal Article · Sat Sep 25 00:00:00 EDT 2021 · Nano Energy

DOI:https://doi.org/10.1016/j.nanoen.2020.105413· OSTI ID:1671107

Zhang, Jia ^[1]; ^[2]; ^[2]; Hu, Bin ^[1]

Univ. of Tennessee, Knoxville, TN (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Perovskite light-emitting diodes (LEDs) are normally operated under forward direct current (DC) to realize electron/hole injection at cathode/anode surfaces. In this work, we demonstrate an alternating current (AC) driven LED enabled by bi-directionally allowed charge transport in quasi-2D perovskite (PEA₂MA_n-1PbnI_3n+1) film. Essentially, the bi-directional charge transport is realized by uniformly arranging different-n-value 2D nanoplates together with symmetrically designed anode/cathode interfaces, which can allow injected electrons and holes to form light-emitting states under both forward and reverse biases, leading to an AC electroluminescence (EL) with the device architecture of ITO/PEI/PEDOT:PSS/PEA₂MA_n-1PbnI_3n+1/P3HT/PEI/Ag. The high AC EL performance was achieved with the radiance = 24 W Sr^-1 m^-2 and 18.3 W Sr^-1 m^-2 and EQE = 12.5% and 3.7% under forward and reverse biases. Furthermore, the device-operational stability was largely improved with the half-intensity time of T₅₀ = 11.0 h under AC bias (+2 V/-2 V, 50 Hz) as compared to T₅₀ = 3.9 h under forward bias (+2 V/0 V, 50 Hz).

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: National Science Foundation (NSF); US Air Force Office of Scientific Research (AFOSR); USDOE Office of Science (SC)

Grant/Contract Number:: 89233218CNA000001; AC02-06CH11357

OSTI ID:: 1671107

Alternate ID(s):: OSTI ID: 1671122

Report Number(s):: LA-UR--20-25291

Journal Information:: Nano Energy, Journal Name: Nano Energy Vol. 79; ISSN 2211-2855

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
AC LEDs
Quasi-2D perovskites
bidirectional transport
perovskite LEDs
symmetrical device design

Enabling AC electroluminescence in quasi-2D perovskites by uniformly arranging different-n-value nanoplates to allow bidirectional charge transport

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