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Cited 36 time in webofscience Cited 37 time in scopus
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Functionalized PFN-X (X = Cl, Br, or I) for Balanced Charge Carriers of Highly Efficient Blue Light-Emitting Diodes

Authors
Shin, Yun SeopYoon, Yung JinHeo, JungwooSong, SuheeKim, Jae WonPark, Song YiCho, Hye WonKim, Gi-HwanKim, Jin Young
Issue Date
5-Aug-2020
Publisher
AMER CHEMICAL SOC
Keywords
perovskite nanocrystals; light-emitting diodes; conjugated polyelectrolytes; interfacial engineering; electroluminescence
Citation
ACS APPLIED MATERIALS & INTERFACES, v.12, no.31, pp.35740 - 35747
Indexed
SCIE
SCOPUS
Journal Title
ACS APPLIED MATERIALS & INTERFACES
Volume
12
Number
31
Start Page
35740
End Page
35747
URI
https://scholarworks.bwise.kr/gnu/handle/sw.gnu/6310
DOI
10.1021/acsami.0c09968
ISSN
1944-8244
Abstract
All-inorganic perovskite nanocrystals (PeNCs), CsPbX3 (X = Cl, Br, or I), have been considered as one of the prospective emissive materials for display applications, which showed superior photoluminescence quantum yield and high color purity with narrow spectral line width. Recently, high-performance green and red perovskite light-emitting diodes (PeLEDs) were introduced; however, the efficiency of blue PeLEDs still lagged owing to PeNCs' deep HOMO energy level (similar to 6.0 eV), which is in discord with the adjacent organic interlayer. In this work, we demonstrated an interfacial engineering strategy with conjugated polyelectrolytes, functionalized PFN (poly[(9,9-bis(3'-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene)]) with halide anions, between the hole injection layer and PeNCs. By introducing PFN-X (X = Cl, Br, or I), they exhibit well-balanced charge carriers and resultant effective radiative recombination in the PeNC layer with reduced hole injection barrier and electron blocking behavior. Among them, in particular, the PFN-Cl-treated PeLEDs display a maximum external quantum efficiency of 1.34% at 470 nm electroluminescence emission with enhanced spectral operating stability.
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