Τίτλος:
High efficiency blue organic light-emitting diodes with below-bandgap electroluminescence
Γλώσσες Τεκμηρίου:
Αγγλικά
Περίληψη:
Blue organic light-emitting diodes require high triplet interlayer materials, which induce large energetic barriers at the interfaces resulting in high device voltages and reduced efficiencies. Here, we alleviate this issue by designing a low triplet energy hole transporting interlayer with high mobility, combined with an interface exciplex that confines excitons at the emissive layer/electron transporting material interface. As a result, blue thermally activated delay fluorescent organic light-emitting diodes with a below-bandgap turn-on voltage of 2.5 V and an external quantum efficiency (EQE) of 41.2% were successfully fabricated. These devices also showed suppressed efficiency roll-off maintaining an EQE of 34.8% at 1000 cd m−2. Our approach paves the way for further progress through exploring alternative device engineering approaches instead of only focusing on the demanding synthesis of organic compounds with complex structures. © 2021, The Author(s).
Συγγραφείς:
Vasilopoulou, M.
Mohd Yusoff, A.R.
Daboczi, M.
Conforto, J.
Gavim, A.E.X.
da Silva, W.J.
Macedo, A.G.
Soultati, A.
Pistolis, G.
Schneider, F.K.
Dong, Y.
Jacoutot, P.
Rotas, G.
Jang, J.
Vougioukalakis, G.C.
Chochos, C.L.
Kim, J.-S.
Gasparini, N.
Περιοδικό:
Nature Communications
Εκδότης:
Institute of Geographic Sciences and Natural Resources Research
Λέξεις-κλειδιά:
organic compound, detection method; efficiency measurement; electrode; electron; organic compound, absorption spectroscopy; Article; carbon nuclear magnetic resonance; cyclic voltammetry; electric potential; electron transport; gel permeation chromatography; luminescence; photoluminescence; proton nuclear magnetic resonance; quantum chemistry; secondary ion mass spectrometry
DOI:
10.1038/s41467-021-25135-z
