Towards efficient near-infrared fluorescent organic light-emitting diodes

Alessandro Minotto; Ibrahim Bulut; Alexandros G. Rapidis; Giuseppe Carnicella; Maddalena Patrini; Eugenio Lunedei; Harry L. Anderson; Franco Cacialli

doi:10.1038/s41377-020-00456-8

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Towards efficient near-infrared fluorescent organic light-emitting diodes

Articles

- Towards efficient near-infrared fluorescent organic light-emitting diodes
- Light: Science & Applications Vol. 10, Issue 2, Pages: 166-175(2021)
- Affiliations：
  
  1.Department of Physics and Astronomy and London Centre for Nanotechnology, University College London, London WC1E 6BT, UK
  2.Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, UK
  3.Dipartimento di Fisica, Università degli Studi di Pavia, Via A. Bassi, 6, Pavia 27100, Italy
  4.CNR-ISMN, Istituto per lo Studio dei Materiali Nanostrutturati, Consiglio Nazionale delle Ricerche, Via P. Gobetti 101, Bologna 40129, Italy
- Author bio：
  
  Harry L. Anderson (harry.anderson@chem.ox.ac.uk)
  Franco Cacialli (f.cacialli@ucl.ac.uk)
- Funds：
- DOI：10.1038/s41377-020-00456-8
  CLC：
- Published：2021，
  
  Published Online：21 January 2021，
  
  Received：15 April 2020，
  
  Revised：07 December 2020，
  
  Accepted：15 December 2020
- Accepted：
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Minotto, A. et al. Towards efficient near-infrared fluorescent organic light-emitting diodes. Light: Science & Applications, 10, 166-175 (2021).
DOI：

Minotto, A. et al. Towards efficient near-infrared fluorescent organic light-emitting diodes. Light: Science & Applications, 10, 166-175 (2021). DOI： 10.1038/s41377-020-00456-8.

摘要

Abstract

The energy gap law (

-law) and aggregation quenching are the main limitations to overcome in the design of near-infrared (NIR) organic emitters. Here

we achieve unprecedented results by synergistically addressing both of these limitations. First

we propose porphyrin oligomers with increasing length to attenuate the effects of the

-law by suppressing the non-radiative rate growth

and to increase the radiative rate via enhancement of the oscillator strength. Second

we design side chains to suppress aggregation quenching. We find that the logarithmic rate of variation in the non-radiative rate vs.

is suppressed by an order of magnitude with respect to previous studies

and we complement this breakthrough by demonstrating organic light-emitting diodes with an average external quantum efficiency of ~1.1%

which is very promising for a heavy-metal-free 850 nm emitter. We also present a novel quantitative model of the internal quantum efficiency for active layers supporting triplet-to-singlet conversion. These results provide a general strategy for designing high-luminance NIR emitters.

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Keywords

references

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