Solid cyclooctatetraene-based triplet quencher demonstrating excellent suppression of singlet–triplet annihilation in optical and electrical excitation

Van T.N. Mai, Viqar Ahmad, Masashi Mamada, Toshiya Fukunaga, Atul Shukla, Jan Sobus, Gowri Krishnan, Evan G. Moore, Gunther G. Andersson, Chihaya Adachi, Ebinazar B. Namdas, Shih Chun Lo

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    3 Citations (Scopus)
    3 Downloads (Pure)

    Abstract

    Triplet excitons have been identified as the major obstacle to the realisation of organic laser diodes, as accumulation of triplet excitons leads to significant losses under continuous wave (CW) operation and/or electrical excitation. Here, we report the design and synthesis of a solid-state organic triplet quencher, as well as in-depth studies of its dispersion into a solution processable bis-stilbene-based laser dye. By blending the laser dye with 20 wt% of the quencher, negligible effects on the ASE thresholds, but a complete suppression of singlet–triplet annihilation (STA) and a 20-fold increase in excited-state photostability of the laser dye under CW excitation, were achieved. We used small-area OLEDs (0.2 mm2) to demonstrate efficient STA suppression by the quencher in the nanosecond range, supported by simulations to provide insights into the observed STA quenching under electrical excitation. The results demonstrate excellent triplet quenching ability under both optical and electrical excitations in the nanosecond range, coupled with excellent solution processability.

    Original languageEnglish
    Article number5623
    Number of pages9
    JournalNature Communications
    Volume11
    DOIs
    Publication statusPublished - 6 Nov 2020

    Keywords

    • Electronic and spintronic devices
    • Electronic devices
    • Electronic materials
    • Semiconductor lasers
    • Triplet excitons
    • organic laser diodes

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