Judicious heteroatom doping produces high-performance deep blue/near-UV multiresonant thermally activated delayed fluorescence OLEDs

Subeesh Madayanad Suresh; Le Zhang; Tomas Matulaitis; David Hall; Changfeng Si; Gaetano Ricci; Alexandra M. Z. Slawin; Stuart Warriner; David Beljonne; Yoann Olivier; Ifor D. W. Samuel; Eli Zysman-Colman

doi:10.1002/adma.202300997

Judicious heteroatom doping produces high-performance deep blue/near-UV multiresonant thermally activated delayed fluorescence OLEDs

Subeesh Madayanad Suresh, Le Zhang, Tomas Matulaitis, David Hall, Changfeng Si, Gaetano Ricci, Alexandra M. Z. Slawin, Stuart Warriner, David Beljonne, Yoann Olivier, Ifor D. W. Samuel^*, Eli Zysman-Colman^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

Two multiresonant thermally activated delayed fluorescence (MR-TADF) emitters are presented and it is shown how further borylation of a deep-blue MR-TADF emitter, DIDOBNA-N, both blueshifts and narrows the emission producing a new near-UV MR-TADF emitter, MesB-DIDOBNA-N, are shown. DIDOBNA-N emits bright blue light (Φ_PL = 444 nm, FWHM = 64 nm, Φ_PL = 81%, τ_d = 23 ms, 1.5 wt% in TSPO1). The deep-blue organic light-emitting diode (OLED) based on this twisted MR-TADF compound shows a very high maximum external quantum efficiency (EQE_max) of 15.3% for a device with CIE_y of 0.073. The fused planar MR-TADF emitter, MesB-DIDOBNA-N shows efficient and narrowband near-UV emission (λ_PL = 402 nm, FWHM = 19 nm, Φ_PL = 74.7%, τ_d = 133 ms, 1.5 wt% in TSPO1). The best OLED with MesB-DIDOBNA-N, doped in a co-host, shows the highest efficiency reported for a near-UV OLED at 16.2%. With a CIE_y coordinate of 0.049, this device also shows the bluest EL reported for a MR-TADF OLED to date.

Original language	English
Article number	2300997
Journal	Advanced Materials
Volume	35
Issue number	33
Early online date	6 Jul 2023
DOIs	https://doi.org/10.1002/adma.202300997
Publication status	Published - 17 Aug 2023

Keywords

Boron
Deep-blue emitters
Multiresonant thermally activated delayed fluorescence
Near-UV emitters
Organic light-emitting diodes (OLEDs)

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Copyright © 2023 The Authors. Advanced Materials published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
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Madayanad Suresh, S., Zhang, L., Matulaitis, T., Hall, D., Si, C., Ricci, G., Slawin, A. M. Z., Warriner, S., Beljonne, D., Olivier, Y., Samuel, I. D. W., & Zysman-Colman, E. (2023). Judicious heteroatom doping produces high-performance deep blue/near-UV multiresonant thermally activated delayed fluorescence OLEDs. Advanced Materials, 35(33), Article 2300997. https://doi.org/10.1002/adma.202300997

@article{7f0013b407e94f619ab6162cf7e86ebc,

title = "Judicious heteroatom doping produces high-performance deep blue/near-UV multiresonant thermally activated delayed fluorescence OLEDs",

abstract = "Two multiresonant thermally activated delayed fluorescence (MR-TADF) emitters are presented and it is shown how further borylation of a deep-blue MR-TADF emitter, DIDOBNA-N, both blueshifts and narrows the emission producing a new near-UV MR-TADF emitter, MesB-DIDOBNA-N, are shown. DIDOBNA-N emits bright blue light (ΦPL = 444 nm, FWHM = 64 nm, ΦPL = 81\%, τd = 23 ms, 1.5 wt\% in TSPO1). The deep-blue organic light-emitting diode (OLED) based on this twisted MR-TADF compound shows a very high maximum external quantum efficiency (EQEmax) of 15.3\% for a device with CIEy of 0.073. The fused planar MR-TADF emitter, MesB-DIDOBNA-N shows efficient and narrowband near-UV emission (λPL = 402 nm, FWHM = 19 nm, ΦPL = 74.7\%, τd = 133 ms, 1.5 wt\% in TSPO1). The best OLED with MesB-DIDOBNA-N, doped in a co-host, shows the highest efficiency reported for a near-UV OLED at 16.2\%. With a CIEy coordinate of 0.049, this device also shows the bluest EL reported for a MR-TADF OLED to date.",

keywords = "Boron, Deep-blue emitters, Multiresonant thermally activated delayed fluorescence, Near-UV emitters, Organic light-emitting diodes (OLEDs)",

author = "\{Madayanad Suresh\}, Subeesh and Le Zhang and Tomas Matulaitis and David Hall and Changfeng Si and Gaetano Ricci and Slawin, \{Alexandra M. Z.\} and Stuart Warriner and David Beljonne and Yoann Olivier and Samuel, \{Ifor D. W.\} and Eli Zysman-Colman",

note = "Funding: This project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sk{\l}odowska Curie grant agreement No 838885 (NarrowbandSSL). S.M.S. acknowledges support from the Marie Sk{\l}odowska-Curie Individual Fellowship (grant agreement No 838885 NarrowbandSSL). The authors would like to thank the Leverhulme Trust (RPG-2016-047) for financial support. E.Z.-C. and I.D.W.S. acknowledge support from EPSRC (EP/L017008, EP/P010482/1). Computational resources have been provided by the Consortium des {\'E}quipements de Calcul Intensif (C{\'E}CI), funded by the Fonds de la Recherche Scientifiques de Belgique (F. R. S.-FNRS) under Grant No. 2.5020.11, as well as the Tier-1 supercomputer of the F{\'e}d{\'e}ration Wallonie-Bruxelles, infrastructure funded by the Walloon Region under the grant agreement n1117545. Y.O. acknowledges funding by the Fonds de la Recherche Scientifique-FNRS under Grant n°F.4534.21 (MIS-IMAGINE). D.B. is a FNRS Research Director. G.R. acknowledges a grant from the “Fonds pour la formation {\`a} la Recherche dans l'Industrie et dans l'Agriculture” (FRIA) of the FRS-FNRS.",

year = "2023",

month = aug,

day = "17",

doi = "10.1002/adma.202300997",

language = "English",

volume = "35",

journal = "Advanced Materials",

issn = "0935-9648",

publisher = "Wiley-Blackwell",

number = "33",

}

Madayanad Suresh, S, Zhang, L, Matulaitis, T, Hall, D, Si, C, Ricci, G, Slawin, AMZ, Warriner, S, Beljonne, D, Olivier, Y, Samuel, IDW & Zysman-Colman, E 2023, 'Judicious heteroatom doping produces high-performance deep blue/near-UV multiresonant thermally activated delayed fluorescence OLEDs', Advanced Materials, vol. 35, no. 33, 2300997. https://doi.org/10.1002/adma.202300997

TY - JOUR

T1 - Judicious heteroatom doping produces high-performance deep blue/near-UV multiresonant thermally activated delayed fluorescence OLEDs

AU - Madayanad Suresh, Subeesh

AU - Zhang, Le

AU - Matulaitis, Tomas

AU - Hall, David

AU - Si, Changfeng

AU - Ricci, Gaetano

AU - Slawin, Alexandra M. Z.

AU - Warriner, Stuart

AU - Beljonne, David

AU - Olivier, Yoann

AU - Samuel, Ifor D. W.

AU - Zysman-Colman, Eli

N1 - Funding: This project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska Curie grant agreement No 838885 (NarrowbandSSL). S.M.S. acknowledges support from the Marie Skłodowska-Curie Individual Fellowship (grant agreement No 838885 NarrowbandSSL). The authors would like to thank the Leverhulme Trust (RPG-2016-047) for financial support. E.Z.-C. and I.D.W.S. acknowledge support from EPSRC (EP/L017008, EP/P010482/1). Computational resources have been provided by the Consortium des Équipements de Calcul Intensif (CÉCI), funded by the Fonds de la Recherche Scientifiques de Belgique (F. R. S.-FNRS) under Grant No. 2.5020.11, as well as the Tier-1 supercomputer of the Fédération Wallonie-Bruxelles, infrastructure funded by the Walloon Region under the grant agreement n1117545. Y.O. acknowledges funding by the Fonds de la Recherche Scientifique-FNRS under Grant n°F.4534.21 (MIS-IMAGINE). D.B. is a FNRS Research Director. G.R. acknowledges a grant from the “Fonds pour la formation à la Recherche dans l'Industrie et dans l'Agriculture” (FRIA) of the FRS-FNRS.

PY - 2023/8/17

Y1 - 2023/8/17

N2 - Two multiresonant thermally activated delayed fluorescence (MR-TADF) emitters are presented and it is shown how further borylation of a deep-blue MR-TADF emitter, DIDOBNA-N, both blueshifts and narrows the emission producing a new near-UV MR-TADF emitter, MesB-DIDOBNA-N, are shown. DIDOBNA-N emits bright blue light (ΦPL = 444 nm, FWHM = 64 nm, ΦPL = 81%, τd = 23 ms, 1.5 wt% in TSPO1). The deep-blue organic light-emitting diode (OLED) based on this twisted MR-TADF compound shows a very high maximum external quantum efficiency (EQEmax) of 15.3% for a device with CIEy of 0.073. The fused planar MR-TADF emitter, MesB-DIDOBNA-N shows efficient and narrowband near-UV emission (λPL = 402 nm, FWHM = 19 nm, ΦPL = 74.7%, τd = 133 ms, 1.5 wt% in TSPO1). The best OLED with MesB-DIDOBNA-N, doped in a co-host, shows the highest efficiency reported for a near-UV OLED at 16.2%. With a CIEy coordinate of 0.049, this device also shows the bluest EL reported for a MR-TADF OLED to date.

AB - Two multiresonant thermally activated delayed fluorescence (MR-TADF) emitters are presented and it is shown how further borylation of a deep-blue MR-TADF emitter, DIDOBNA-N, both blueshifts and narrows the emission producing a new near-UV MR-TADF emitter, MesB-DIDOBNA-N, are shown. DIDOBNA-N emits bright blue light (ΦPL = 444 nm, FWHM = 64 nm, ΦPL = 81%, τd = 23 ms, 1.5 wt% in TSPO1). The deep-blue organic light-emitting diode (OLED) based on this twisted MR-TADF compound shows a very high maximum external quantum efficiency (EQEmax) of 15.3% for a device with CIEy of 0.073. The fused planar MR-TADF emitter, MesB-DIDOBNA-N shows efficient and narrowband near-UV emission (λPL = 402 nm, FWHM = 19 nm, ΦPL = 74.7%, τd = 133 ms, 1.5 wt% in TSPO1). The best OLED with MesB-DIDOBNA-N, doped in a co-host, shows the highest efficiency reported for a near-UV OLED at 16.2%. With a CIEy coordinate of 0.049, this device also shows the bluest EL reported for a MR-TADF OLED to date.

KW - Boron

KW - Deep-blue emitters

KW - Multiresonant thermally activated delayed fluorescence

KW - Near-UV emitters

KW - Organic light-emitting diodes (OLEDs)

UR - https://www.scopus.com/pages/publications/85164128890

U2 - 10.1002/adma.202300997

DO - 10.1002/adma.202300997

M3 - Article

SN - 0935-9648

VL - 35

JO - Advanced Materials

JF - Advanced Materials

IS - 33

M1 - 2300997

ER -

Judicious heteroatom doping produces high-performance deep blue/near-UV multiresonant thermally activated delayed fluorescence OLEDs

Abstract

Keywords

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H2020 MSCA IF 2018 (Subeesh Suresh): H2020 MSCA IF 2018 (Subeesh Suresh )

TADF Emitters for OLEDs - Ifor Samuel: TADF Emitters for OLEDs

TADF Emitters for OLEDs - Eli Zysman: TADF Emitters for OLEDs