|1:25 – 1:50pm
||Red Emission from Nature Inspired Bay-Annulated Indigo Derivatives
Ms Nicholle Wallwork 1,2
University of Queensland
Atul Shukla,1,3 Xin Li,1,2 Jan Sobus,1,3 Van T. N. Mai,1,2 Sarah K. M. McGregor,1,2 Kay Chen,2 Romain J. Lepage,2 Elizabeth H. Krenske,2 Evan G. Moore,2 M. Mamada,4 C. Adachi,4,* Ebinazar B. Namdas,1,3* Shih-Chun Lo1,2*1. Centre for Organic Photonics & Electronics, The University of Queensland, Brisbane, Queensland, 4072, Australia
2. School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland, 4072, Queensland, Australia
3. School of Mathematics and Physics, The University of Queensland, Queensland, Brisbane, Queensland, 4072, Australia
4. Centre for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan
Organic semiconductor materials offer high mechanical flexibility and high wavelength-tunability, which have great potential as a complementary technology to current inorganic lasers, particularly for spectroscopy, sensing, optical data communication, display, and security tag applications.1 Recent research efforts on organic semiconductor lasers have demonstrated notable organic semiconductor materials possessing both high optical gain and low amplified spontaneous emission (ASE) thresholds in blue and green colours.2 However, the same progress has not been made on red laser dyes mainly due to their low photoluminescence quantum yields (PLQYs) recognised as the “energy bandgap law” for low-energy emission.
To overcome this, in this presentation our development of a new family of solution-processable organic semiconductor laser dyes with deep-red emission, high thermal stability and high PLQYs (≈100%) will be shown. Our strategies in achieving low film ASE thresholds (9.6 μJ/cm2 at 650 nm), low laser thresholds (6 μJ/cm2) and high stability under optical pumping (retained 90% of the initial output even after ≈9,600 pump pulses of continuous pumping at 20 Hz) will be further discussed.3 Finally, our preliminary work on TADF-Assistant Fluorescent OLEDs (TAF-OLEDs)4 based on the new red laser dyes will be demonstrated to show high promise as a new family of organic semiconductor materials.
References: 1. A. J. C. Kuehne, M. C. Gather., Chem. Rev. 2016, 116, 12823. 2. T. N. V. Mai, A. Shukla, M. Mamada, S. Maedera, P. E. Shaw, J. Sobus, I. Allison, C. Adachi, E. B. Namdas, S.-C. Lo, ACS Photonics 2018, 5, 4447; Y. Oyama, M. Mamada, A. Shukla, E. G. Moore, S.-C. Lo, E. B. Namdas, C. Adachi, ACS Mater. Lett. 2020, 21, 161. 3. A. Shukla, N. R. Wallwork, X. Li, J. Sobas, V. T. N. Mai, S. K. M. McGregor, K. Chen, R. J. Lepage, E. H. Krenske, E. G. Moore, E. B. Namdas, S.-C. Lo, Adv. Opt. Mater. 2020, 8, 1901350. 4. H. Nakanotani, T. Higuchi, T. Furukawa, K. Masui, K. Morimoto, M. Numata, H. Tanaka, Y. Sagara, T. Yasuda, C. Adachi, Nature Commun. 2014, 5, 4016.
Acknowledgement: We thank Australian Research Council (DP160100700 and DP180103047), and Department of Industry, Innovation and Science (AISRF53765), and Japan Society for the Promotion of Science (JSPS Core-to-Core 18050011-000441) for financial support.