Linear Coinage Metal Complexes for Highly Efficient Solution and Vapour-deposited OLEDs

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Abstract

Alexander Romanov
East Anglia
Linear Coinage Metal Complexes for Highly Efficient Solution and Vapour -deposited OLEDs Alexander S. Romanov School of Chemistry, University of East Anglia, Norwich, NR4 7TJ, UK. E-mail : a.romanov@uea.ac.uk
Two -coordinate coinage metal complexes with linear geometry L –Metal –X (L = carbene and X = anionic ligand) have recently emerged as a new class of strongly photoemissive materials – Carbene Metal Amides (CMA). 1-5 Their effectiveness is based on a combination of the ligands with a complementary donor and acceptor properties. A wide range of mononuclear copper, silver and gold complexes will be presented where the molecular design allowed us to control key luminescence parameters such as excited state lifetime , photoluminescence quantum yields (PLQY) a nd others . Close to unity PLQY values and short excited state lifetimes at room temperature ( <1 μs) have been realized . Varied temper ature experiments support thermally activated process with very low activation energy barriers (20 –150 meV) and luminescence via delayed fluorescence (TADF) mechanism . Comparison and key differences of the various CMA materials will be discussed to showcase the role of the metal bridge and organic ligands , steric and electronic factors or result of their interplay . Highly -efficient host -guest and host -free organic light -emitting diodes (OLED) have been fabricated via so lution or evaporated techniques while maintain ing high performance at pra ctical brightness levels of 100 and 1000 cd m-2. Given the flexibility of the linear geometry , CMA materials can exist in a range of structural forms unlocking mechano chromic and stimuli -responsive properties and paving the way towards various photonic applications . References: (1) Di, D.; Romanov, A. S.; et al . Science . 2017 , 356 , 159 –163; (2) Conaghan, et al., Adv. Mater . 2018 , 30 , 1802285; (3) Romanov, A. S. et al., Adv. Optical Mater. 2018 , 6, 1801347. (4) Romanov, A. S. et al ., Chem. Mater ., 2019 , 31(10) , 3613 –3623.
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  • Venue

    Theatre C, Purdie

  • Date

    December 10, 2019

  • Time

    From: 14h15 To: 15h15

  • Sponsor

    University of St Andrews
    The oldest university in Scotland, with international renown for both research and education of undergraduates and postgraduates.

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