Energy and Charge Dual Transfer Engineering for High‐Performance Green Perovskite Light‐Emitting Diodes

Perovskite light‐emitting diodes (PeLEDs) have garnered considerable interest in recent years owing to their unique optoelectronic properties. However, the performance of PeLEDs is limited by their low quantum efficiency and unbalanced charge injection. In this study, to address these issues, a nove...

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Bibliographic Details
Published in:Advanced functional materials 2022-05, Vol.32 (21), p.n/a
Main Authors: An, Hee Ju, Baek, Sung Doo, Kim, Do Hoon, Myoung, Jae‐Min
Format: Article
Language:English
Subjects:
Charge efficiency
Charge injection
Charge transfer
Composition
Current efficiency
Efficiency
energy band engineering
Energy levels
Energy transfer
Förster resonant energy transfer
hole transport layer
Light emitting diodes
Materials science
Optoelectronics
perovskite light‐emitting diode
Perovskites
Polyvinyl carbazole
Quantum efficiency
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Summary:Perovskite light‐emitting diodes (PeLEDs) have garnered considerable interest in recent years owing to their unique optoelectronic properties. However, the performance of PeLEDs is limited by their low quantum efficiency and unbalanced charge injection. In this study, to address these issues, a novel co‐hole transport layer (HTL) of 4,4′‐bis(N‐carbazolyl)‐1,1′‐biphenyl (CBP) and poly(9‐vinylcarbazole) (PVK) is introduced into PeLEDs. By optimizing the composition ratio of CBP and PVK, the performance of CsPbBr3‐based PeLEDs is significantly improved via efficient Förster resonant energy transfer and an enhanced charge transfer owing to the well‐aligned energy levels of the HTLs with the emission layers. The PeLED with an optimized composition ratio of the PVK0.5–CBP0.5 HTL exhibits the best device performance with a luminance of 31641 cd∙m−2, current efficiency of 39.2 cd∙A−1, and external quantum efficiency of 15.4%. Thus, the proposed strategy engineering dual transfer of energy and charge is expected to be revolutionary in the field of PeLED research. The perovskite light‐emitting diodes with a novel co‐hole transport layer of 4,4‐bis(N‐carbazolyl)‐1,1′‐biphenyl and poly(9‐vinylcarbazole) exhibited excellent device performance due to efficient Förster resonant energy transfer and enhanced charge transfer.
ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.202112849