Band Edge Control of Quasi–2D Metal Halide Perovskites for Blue Light–Emitting Diodes with Enhanced Performance

Worku, Michael; Ben‐Akacha, Azza; Sridhar, Samanvitha; Frick, Jordan R.; Yin, Shichen; He, Qingquan; Robb, Alex J.; Chaaban, Maya; Liu, He; Winfred, J. S. Raaj Vellore; Hanson, Kenneth; So, Franky; Dougherty, Daniel; Ma, Biwu

doi:10.1002/adfm.202103299

Band Edge Control of Quasi–2D Metal Halide Perovskites for Blue Light–Emitting Diodes with Enhanced Performance

Journal Article · Sun Aug 08 00:00:00 UTC 2021 · Advanced Functional Materials

DOI:https://doi.org/10.1002/adfm.202103299· OSTI ID:1981335

Worku, Michael ^[1]; Ben‐Akacha, Azza ^[1]; Sridhar, Samanvitha ^[2]; Frick, Jordan R. ^[2]; Yin, Shichen ^[2]; He, Qingquan ^[1]; Robb, Alex J. ^[1]; Chaaban, Maya ^[1]; Liu, He ^[1]; Winfred, J. S. Raaj Vellore ^[1]; Hanson, Kenneth ^[1]; So, Franky ^[2]; Dougherty, Daniel ^[2]; ^[1]

Florida State Univ., Tallahassee, FL (United States)
North Carolina State University, Raleigh, NC (United States)

Perovskite light–emitting diodes (PeLEDs) have received great attention for their potential as next–generation display technology. While remarkable progress has been achieved in green, red, and near–infrared PeLEDs with external quantum efficiencies (EQEs) exceeding 20%, obtaining high performance blue PeLEDs remains a challenge. Poor charge balance due to large charge injection barriers in blue PeLEDs has been identified as one of the major roadblocks to achieve high efficiency. Here band edge control of perovskite emitting layers for blue PeLEDs with enhanced charge balance and device performance is reported. By using organic spacer cations with different dipole moments, that is, phenethyl ammonium (PEA), methoxy phenethyl ammonium (MePEA), and 4–fluoro phenethyl ammonium (4FPEA), the band edges of quasi–2D perovskites are tuned without affecting their band gaps. Furthermore, detailed characterization and computational studies have confirmed the effect of dipole moment modification to be mostly electrostatic, resulting in changes in the ionization energies of ≈0.45 eV for MePEA and ≈ –0.65 eV for 4FPEA based thin films relative to PEA–based thin films. With improved charge balance, blue PeLEDs based on MePEA quasi–2D perovskites show twofold increase of the EQE as compared to the control PEA based devices.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Molecular Foundry

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

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1981335

Alternate ID(s):: OSTI ID: 1812399

Journal Information:: Advanced Functional Materials, Journal Name: Advanced Functional Materials Journal Issue: 45 Vol. 31; ISSN 1616-301X

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Band edge control
Blue perovskite LEDs
Charge balance
Chemistry
Materials Science
Physics
Quasi-2D perovskites
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Band Edge Control of Quasi–2D Metal Halide Perovskites for Blue Light–Emitting Diodes with Enhanced Performance

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