Hyperphosphorescent OLEDs: harnessing the power of MR-TADF terminal emitters

Emma V.  Puttock; Janine Haug; Eli Zysman-Colman; Stefan Bräse

doi:10.1002/adom.202500514

Hyperphosphorescent OLEDs: harnessing the power of MR-TADF terminal emitters

Emma V. Puttock^*, Janine Haug, Eli Zysman-Colman, Stefan Bräse

^*Corresponding author for this work

Research output: Contribution to journal › Review article › peer-review

Abstract

Hyperphosphorescent organic light-emitting diodes (HP-OLEDs) represent an attractive solution to persistent efficiency roll-off and device stability issues, combining phosphorescent sensitizers with fluorescent terminal emitters to achieve efficient, narrowband emission. This review discusses advances in HP-OLEDs where the terminal emitter is a multiresonance thermally activated delayed fluorescence compound. Recent breakthroughs in device performance, including examples demonstrating both high maximum external quantum efficiencies (EQE_max) and excellent color purity, are highlighted. This review summarizes design strategies, challenges, and future directions for improving the efficiency, stability, and spectral performance of HP-OLEDs.

Original language	English
Article number	2500514
Number of pages	25
Journal	Advanced Optical Materials
Volume	Early View
Early online date	22 May 2025
DOIs	https://doi.org/10.1002/adom.202500514
Publication status	E-pub ahead of print - 22 May 2025

Keywords

Hyperphosphorescence (HP)
Organic light-emitting diodes (OLEDs)
Phosphor-sensitized fluorescence (PSF)
Multi-resonance thermally activated delayed fluorescence (MR-TADF)
Forster resonance energy transfer (FRET)
External quantum efficiency (EQE)
Device stability

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10.1002/adom.202500514Licence: CC BY

Puttock_2025_AOM_Hyperphosphorescent-OLEDs-MR-TADF-terminal-emitters_CC
© 2025 The Author(s). This is an open access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Final published version, 4.55 MBLicence: CC BY

1 Finished
1 Active

Allan Watson Programme Grant: Boron: Beyond the Reagent
Watson, A. (PI), Morris, R. (CoI), Smith, A. (CoI) & Zysman-Colman, E. (CoI)
UK Research and Innovation
1/05/23 → 30/04/28
Project: Standard
MR TADF: Multi-resonance TADF materials for highly efficient and stable OLEDs
Zysman-Colman, E. (PI)
EPSRC
1/07/22 → 30/06/25
Project: Standard

Cite this

@article{9e657a802e4040bd8c1bb4fd2b027672,

title = "Hyperphosphorescent OLEDs: harnessing the power of MR-TADF terminal emitters",

abstract = "Hyperphosphorescent organic light-emitting diodes (HP-OLEDs) represent an attractive solution to persistent efficiency roll-off and device stability issues, combining phosphorescent sensitizers with fluorescent terminal emitters to achieve efficient, narrowband emission. This review discusses advances in HP-OLEDs where the terminal emitter is a multiresonance thermally activated delayed fluorescence compound. Recent breakthroughs in device performance, including examples demonstrating both high maximum external quantum efficiencies (EQEmax) and excellent color purity, are highlighted. This review summarizes design strategies, challenges, and future directions for improving the efficiency, stability, and spectral performance of HP-OLEDs.",

keywords = "Hyperphosphorescence (HP), Organic light-emitting diodes (OLEDs), Phosphor-sensitized fluorescence (PSF), Multi-resonance thermally activated delayed fluorescence (MR-TADF), Forster resonance energy transfer (FRET), External quantum efficiency (EQE), Device stability",

author = "Puttock, {Emma V.} and Janine Haug and Eli Zysman-Colman and Stefan Br{\"a}se",

note = "Funding: E.V.P. was funded by the European Union from its Framework Programme for Research and Innovation Horizon Europe (2021–2027), under the Marie Sklodowska-Curie Grant Agreement No. 101108406. E.Z.-C. thanks the Engineering and Physical Sciences Research Council of the UK (Grant Nos. EP/W007517/1, EP/W015137/1, and EP/Z535291/1) for support, and the authors acknowledge support from JSPS Core-to-Core Program (Grant No. JPJSCCA20220004).",

year = "2025",

month = may,

day = "22",

doi = "10.1002/adom.202500514",

language = "English",

volume = "Early View",

journal = "Advanced Optical Materials",

issn = "2195-1071",

publisher = "John Wiley & Sons, Ltd",

}

TY - JOUR

T1 - Hyperphosphorescent OLEDs

T2 - harnessing the power of MR-TADF terminal emitters

AU - Puttock, Emma V.

AU - Haug, Janine

AU - Zysman-Colman, Eli

AU - Bräse, Stefan

N1 - Funding: E.V.P. was funded by the European Union from its Framework Programme for Research and Innovation Horizon Europe (2021–2027), under the Marie Sklodowska-Curie Grant Agreement No. 101108406. E.Z.-C. thanks the Engineering and Physical Sciences Research Council of the UK (Grant Nos. EP/W007517/1, EP/W015137/1, and EP/Z535291/1) for support, and the authors acknowledge support from JSPS Core-to-Core Program (Grant No. JPJSCCA20220004).

PY - 2025/5/22

Y1 - 2025/5/22

N2 - Hyperphosphorescent organic light-emitting diodes (HP-OLEDs) represent an attractive solution to persistent efficiency roll-off and device stability issues, combining phosphorescent sensitizers with fluorescent terminal emitters to achieve efficient, narrowband emission. This review discusses advances in HP-OLEDs where the terminal emitter is a multiresonance thermally activated delayed fluorescence compound. Recent breakthroughs in device performance, including examples demonstrating both high maximum external quantum efficiencies (EQEmax) and excellent color purity, are highlighted. This review summarizes design strategies, challenges, and future directions for improving the efficiency, stability, and spectral performance of HP-OLEDs.

AB - Hyperphosphorescent organic light-emitting diodes (HP-OLEDs) represent an attractive solution to persistent efficiency roll-off and device stability issues, combining phosphorescent sensitizers with fluorescent terminal emitters to achieve efficient, narrowband emission. This review discusses advances in HP-OLEDs where the terminal emitter is a multiresonance thermally activated delayed fluorescence compound. Recent breakthroughs in device performance, including examples demonstrating both high maximum external quantum efficiencies (EQEmax) and excellent color purity, are highlighted. This review summarizes design strategies, challenges, and future directions for improving the efficiency, stability, and spectral performance of HP-OLEDs.

KW - Hyperphosphorescence (HP)

KW - Organic light-emitting diodes (OLEDs)

KW - Phosphor-sensitized fluorescence (PSF)

KW - Multi-resonance thermally activated delayed fluorescence (MR-TADF)

KW - Forster resonance energy transfer (FRET)

KW - External quantum efficiency (EQE)

KW - Device stability

U2 - 10.1002/adom.202500514

DO - 10.1002/adom.202500514

M3 - Review article

SN - 2195-1071

VL - Early View

JO - Advanced Optical Materials

JF - Advanced Optical Materials

M1 - 2500514

ER -

Hyperphosphorescent OLEDs: harnessing the power of MR-TADF terminal emitters

Abstract

Keywords

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Projects

Allan Watson Programme Grant: Boron: Beyond the Reagent

MR TADF: Multi-resonance TADF materials for highly efficient and stable OLEDs

Cite this