Efficient and stable organic light-emitting devices employing phosphorescent molecular aggregates

Linyu Cao, Kody Klimes, Yunlong Ji, Tyler Fleetham, Jian Li

Research output: Contribution to journalArticlepeer-review

60 Scopus citations


Stable and efficient organic light-emitting diodes (OLEDs) operating at high brightness are desirable for future high-resolution displays and lighting products. Here, we report a tetradentate Pd(ii) complex called Pd3O8-P, which has attractive optoelectronics properties. At room temperature, aggregates of Pd3O8-P exhibited a close-to-unity photoluminescent quantum yield and a short transient lifetime of 0.62 μs. A host-free Pd3O8-P yellow-orange OLED emitted light with a peak at 588 nm, a half-bandwidth of 84 nm and CIE coordinates of (0.52, 0.47), and achieved a peak external quantum efficiency (EQE) of 34.8%. The device had reduced efficiency roll-off, retaining high EQEs of 33.5% at 1,000 cd m−2 and 29.5% at 10,000 cd m−2. The estimated operational half-lifetime was 9.59 million hours at 1,000 cd m−2. The fact that the tetradentate metal complex has a triplet in the blue-emitting region may also assist the development of efficient and long-lived blue OLEDs in the future.

Original languageEnglish (US)
Pages (from-to)230-237
Number of pages8
JournalNature Photonics
Issue number3
StatePublished - Mar 2021

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics


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