Suppression of external quantum efficiency rolloff in organic light emitting diodes by scavenging triplet excitons

Buddhika S. B. Karunathilaka, Umamahesh Balijapalli, Chathuranganie A. M. Senevirathne, Seiya Yoshida, Yu Esaki, Kenichi Goushi, Toshinori Matsushima (), Atula S. D. Sandanayaka () and Chihaya Adachi ()
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Buddhika S. B. Karunathilaka: Kyushu University
Umamahesh Balijapalli: Kyushu University
Chathuranganie A. M. Senevirathne: Kyushu University
Seiya Yoshida: Kyushu University
Yu Esaki: Kyushu University
Kenichi Goushi: Kyushu University
Toshinori Matsushima: Japan Science and Technology Agency (JST), ERATO, Adachi Molecular Exciton Engineering Project
Atula S. D. Sandanayaka: Kyushu University
Chihaya Adachi: Kyushu University

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract Large external quantum efficiency rolloff at high current densities in organic light-emitting diodes (OLEDs) is frequently caused by the quenching of radiative singlet excitons by long-lived triplet excitons [singlet–triplet annihilation (STA)]. In this study, we adopted a triplet scavenging strategy to overcome the aforementioned STA issue. To construct a model system for the triplet scavenging, we selected 2,6-dicyano-1,1-diphenyl-λ5σ4-phosphinine (DCNP) as the emitter and 4,4′-bis[(N-carbazole)styryl]biphenyl (BSBCz) as the host material by considering their singlet and triplet energy levels. In this system, the DCNP’s triplets are effectively scavenged by BSBCz while the DCNP’s singlets are intact, resulting in the suppressed STA under electrical excitation. Therefore, OLEDs with a 1 wt.%-DCNP-doped BSBCz emitting layer demonstrated the greatly suppressed efficiency rolloff even at higher current densities. This finding favourably provides the advanced light-emitting performance for OLEDs and organic semiconductor laser diodes from the aspect of the suppressed efficiency rolloff.

Date: 2020
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DOI: 10.1038/s41467-020-18292-0

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