Symmetric “Double Spiro” Wide Energy Gap Hosts for Blue Phosphorescent OLED Devices

Jie Ma, Muazzam Idris, Tian Y. Li, Daniel S.M. Ravinson, Tyler Fleetham, Jongchan Kim, Peter I. Djurovich, Stephen R. Forrest, Mark E. Thompson

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Wide energy gap materials dispiro[fluorene-9,9′-anthracene-10′,9″-fluorene] (SAS) and dispiro[xanthene-9,9′-anthracene-10′,9″-xanthene] (XAX) containing double spiro–carbons, are introduced as hosts for blue phosphorescent organic light-emitting diodes (PHOLEDs). Both SAS and XAX are free of heteroatomic exocyclic bonds, which are implicated in limiting the stability of blue PHOLEDs. The materials are synthesized in gram-scale quantities through short and efficient paths. They have large energy gaps (≥5.0 eV) between the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) and correspondingly have high triplet energies in solid state (ET ≈ 3.0 eV). Analysis of devices using SAS and XAX as host materials with the blue phosphorescent dopant fac-tris(N,N-di-p-tolyl-pyrizinoimidazol-2-yl)iridium(III) (Ir(tpz)3), shows that charges are transported and trapped by the dopant, which subsequently forms excitons directly on the phosphor. As a result, luminescence quenching pathways are suppressed which leads to blue phosphorescent devices with high (≈18%) external quantum efficiency. Thus, SAS and XAX serve as promising host materials, with high triplet energies suitable for blue PHOLEDs.

Original languageEnglish
Article number2101530
JournalAdvanced Optical Materials
Volume10
Issue number2
DOIs
Publication statusPublished - 2022 Jan 18

Bibliographical note

Publisher Copyright:
© 2021 Wiley-VCH GmbH

All Science Journal Classification (ASJC) codes

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

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