Low-Threshold Distributed-Feedback Lasers Based on Pyrene-Cored Starburst Molecules with 1,3,6,8-Attached Oligo(9,9-Dialkylfluorene) Arms

Authors

  • Ruidong Xia,

    Corresponding author
    1. Experimental Solid State Physics Group Department of Physics and Centre for Plastic Electronics Imperial College London Prince Consort Road, London, SW7 2AZ (United Kingdom)
    • Experimental Solid State Physics Group Department of Physics and Centre for Plastic Electronics Imperial College London Prince Consort Road, London, SW7 2AZ (United Kingdom).
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  • Wen-Yong Lai,

    1. Jiangsu Key Laboratory for Organic Electronics and Information Displays (KLOEID) Institute of Advanced Materials (IAM) Nanjing University of Posts and Telecommunications (NUPT) 9 Wenyuan Road, Nanjing 210046 (P. R. China)
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  • Peter A. Levermore,

    1. Experimental Solid State Physics Group Department of Physics and Centre for Plastic Electronics Imperial College London Prince Consort Road, London, SW7 2AZ (United Kingdom)
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  • Wei Huang,

    Corresponding author
    1. Jiangsu Key Laboratory for Organic Electronics and Information Displays (KLOEID) Institute of Advanced Materials (IAM) Nanjing University of Posts and Telecommunications (NUPT) 9 Wenyuan Road, Nanjing 210046 (P. R. China)
    • Jiangsu Key Laboratory for Organic Electronics and Information Displays (KLOEID) Institute of Advanced Materials (IAM) Nanjing University of Posts and Telecommunications (NUPT) 9 Wenyuan Road, Nanjing 210046 (P. R. China).
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  • Donal D. C. Bradley

    Corresponding author
    1. Experimental Solid State Physics Group Department of Physics and Centre for Plastic Electronics Imperial College London Prince Consort Road, London, SW7 2AZ (United Kingdom)
    • Experimental Solid State Physics Group Department of Physics and Centre for Plastic Electronics Imperial College London Prince Consort Road, London, SW7 2AZ (United Kingdom).
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Abstract

Here, a detailed characterization of the optical gain properties of sky-blue-light-emitting pyrene-cored 9,9-dialkylfluorene starbursts is reported; it is shown that these materials possess encouragingly low laser thresholds and relatively high thermal and environmental stability. The materials exhibit high solid-state photoluminescence (PL) quantum efficiencies (>90%) and near-single-exponential PL decay transients with excited state lifetimes of ∼1.4 ns. The thin-film slab waveguide amplified spontaneous emission (ASE)-measured net gain reaches 75–78 cm−1. The ASE threshold energy is found to remain unaffected by heating at temperatures up to 130 °C, 40 to 50 °C above Tg. The ASE remained observable for annealing temperatures up to 170 or 200 °C. 1D distributed feedback lasers with 75% fill factor and 320 nm period show optical pumping thresholds down to 38–65 Wcm−2, laser slope efficiencies up to 3.9%, and wavelength tuning ranges of ∼40 nm around 471–512 nm. In addition, these lasers have relatively long operational lifetimes, with N1/2 ≥ 1.1 × 105 pulses for unencapsulated devices operated at ten times threshold in air.

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