Spiro-based thermally activated delayed fluorescence emitters with reduced nonradiative decay for high-quantum-efficiency, low-roll-off, organic light-emitting diodes

Nidhi Sharma; Michal Maciejczyk; David Hall; Wenbo Li; Vincent Liégeois; David Beljonne; Yoann Olivier; Neil Robertson; Ifor D. W. Samuel; Eli Zysman-Colman

doi:10.1021/acsami.1c12234

Spiro-based thermally activated delayed fluorescence emitters with reduced nonradiative decay for high-quantum-efficiency, low-roll-off, organic light-emitting diodes

Nidhi Sharma, Michal Maciejczyk, David Hall, Wenbo Li, Vincent Liégeois, David Beljonne, Yoann Olivier, Neil Robertson, Ifor D. W. Samuel, Eli Zysman-Colman

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

Abstract

Herein, we report the use of spiro-configured fluorene-xanthene scaffolds as a novel, promising, and effective strategy in thermally activated delayed fluorescence (TADF) emitter design to attain high photoluminescence quantum yields (Φ_PL), short delayed luminescence lifetime, high external quantum efficiency (EQE), and minimum efficiency roll-off characteristics in organic light-emitting diodes (OLEDs). The optoelectronic and electroluminescence properties of SFX (spiro-(fluorene-9,9′-xanthene))-based emitters (SFX-PO-DPA, SFX-PO-DPA-Me, and SFX-PO-DPA-OMe) were investigated both theoretically and experimentally. All three emitters exhibited sky blue to green emission enabled by a Herzberg–Teller mechanism in the excited state. They possess short excited-state delayed lifetimes (<10 μs), high photoluminescence quantum yields (Φ_PL ∼ 70%), and small singlet–triplet splitting energies (ΔE_ST < 0.10 eV) in the doped films in an mCP host matrix. The OLEDs showed some of the highest EQEs using spiro-containing emitters where maximum external quantum efficiencies (EQE_max) of 11 and 16% were obtained for devices using SFX-PO-DPA and SFX-PO-DPA-OMe, respectively. Further, a record EQE_max of 23% for a spiro-based emitter coupled with a low efficiency roll-off (19% at 100 cd m–2) was attained with SFX-PO-DPA-Me.

Original language	English
Number of pages	13
Journal	ACS Applied Materials & Interfaces
Volume	Articles ASAP
Early online date	13 Sept 2021
DOIs	https://doi.org/10.1021/acsami.1c12234
Publication status	E-pub ahead of print - 13 Sept 2021

Keywords

Spiro
Fluorene-xanthen
Herzberg-Teller
TADF
Luminescence
OLEDs

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10.1021/acsami.1c12234

Sharma_2021_AMI_Spiro-based-thermally_AAM
Copyright © 2021 American Chemical Society. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1021/acsami.1c12234
Accepted author manuscript, 2.73 MB
Sharma_2021_AMI_Spiro-based-thermally_AAM-SIAccepted author manuscript, 5.2 MB

TADF Emitters for OLEDs - Eli Zysman: TADF Emitters for OLEDs
Zysman-Colman, E. (PI)
EPSRC
1/03/17 → 31/03/21
Project: Standard
Blue-Emitting TADF Materials: Blue-Emitting TADF Materials for OLEDs Based on a Lewis Acid-Containing Acceptor
Zysman-Colman, E. (PI)
The Leverhulme Trust
1/08/16 → 30/04/22
Project: Standard
Equipment Account: Characterisation and Manipulation of Advanced Functional Materials and their Interfaces at the Nanoscale
Samuel, I. D. W. (PI)
EPSRC
1/10/13 → 30/09/23
Project: Standard

Spiro-based Thermally Activated Delayed Fluorescence Emitters with Reduced Non-radiative Decay for High Quantum Efficiency, Low Roll-off, Organic Light-Emitting Diodes (dataset)
Sharma, N. (Creator), Maciejczyk, M. (Creator), Hall, D. (Creator), Li, W. (Creator), Liégeois, V. (Creator), Beljonne, D. (Creator), Olivier, Y. (Creator), Robertson, N. (Creator), Samuel, I. D. W. (Creator) & Zysman-Colman, E. (Creator), University of St Andrews, 20 Sept 2021
DOI: 10.17630/d4641a3f-7f80-452e-b5c4-01d77608d44b
Dataset

File

Cite this

Sharma, N., Maciejczyk, M., Hall, D., Li, W., Liégeois, V., Beljonne, D., Olivier, Y., Robertson, N., Samuel, I. D. W., & Zysman-Colman, E. (2021). Spiro-based thermally activated delayed fluorescence emitters with reduced nonradiative decay for high-quantum-efficiency, low-roll-off, organic light-emitting diodes. ACS Applied Materials & Interfaces, Articles ASAP. Advance online publication. https://doi.org/10.1021/acsami.1c12234

@article{c1e09984f18841a29c8160fed1cd5956,

title = "Spiro-based thermally activated delayed fluorescence emitters with reduced nonradiative decay for high-quantum-efficiency, low-roll-off, organic light-emitting diodes",

abstract = "Herein, we report the use of spiro-configured fluorene-xanthene scaffolds as a novel, promising, and effective strategy in thermally activated delayed fluorescence (TADF) emitter design to attain high photoluminescence quantum yields (ΦPL), short delayed luminescence lifetime, high external quantum efficiency (EQE), and minimum efficiency roll-off characteristics in organic light-emitting diodes (OLEDs). The optoelectronic and electroluminescence properties of SFX (spiro-(fluorene-9,9′-xanthene))-based emitters (SFX-PO-DPA, SFX-PO-DPA-Me, and SFX-PO-DPA-OMe) were investigated both theoretically and experimentally. All three emitters exhibited sky blue to green emission enabled by a Herzberg–Teller mechanism in the excited state. They possess short excited-state delayed lifetimes (<10 μs), high photoluminescence quantum yields (ΦPL ∼ 70%), and small singlet–triplet splitting energies (ΔEST < 0.10 eV) in the doped films in an mCP host matrix. The OLEDs showed some of the highest EQEs using spiro-containing emitters where maximum external quantum efficiencies (EQEmax) of 11 and 16% were obtained for devices using SFX-PO-DPA and SFX-PO-DPA-OMe, respectively. Further, a record EQEmax of 23% for a spiro-based emitter coupled with a low efficiency roll-off (19% at 100 cd m–2) was attained with SFX-PO-DPA-Me.",

keywords = "Spiro, Fluorene-xanthen, Herzberg-Teller, TADF, Luminescence, OLEDs",

author = "Nidhi Sharma and Michal Maciejczyk and David Hall and Wenbo Li and Vincent Li{\'e}geois and David Beljonne and Yoann Olivier and Neil Robertson and Samuel, {Ifor D. W.} and Eli Zysman-Colman",

note = "E.Z.-C. thanks the Leverhulme Trust (No. RPG-2016-047) and the University of St Andrews for support. The authors are grateful to the EPSRC for financial support (grants EP/ P007805/1, EP/P010482/1, EP/L017008/1, EP/J01771X, and EP/J00916). M.M. thanks the Innovation Programme H2020-MSCA-IF-2014-659237 for financial support. W.L. thanks the China Scholarship Council (grant number 201708060003). V.L. thanks the F.R.S.-FNRS for his Research Associate position. 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, GEQ U.G006.15, 1610468, and RW/GEQ. (2016). D.B. is an FNRS Research Director.",

year = "2021",

month = sep,

day = "13",

doi = "10.1021/acsami.1c12234",

language = "English",

volume = "Articles ASAP",

journal = "ACS Applied Materials & Interfaces",

issn = "1944-8244",

publisher = "American Chemical Society (ACS)",

}

Sharma, N, Maciejczyk, M, Hall, D, Li, W, Liégeois, V, Beljonne, D, Olivier, Y, Robertson, N, Samuel, IDW & Zysman-Colman, E 2021, 'Spiro-based thermally activated delayed fluorescence emitters with reduced nonradiative decay for high-quantum-efficiency, low-roll-off, organic light-emitting diodes', ACS Applied Materials & Interfaces, vol. Articles ASAP. https://doi.org/10.1021/acsami.1c12234

TY - JOUR

T1 - Spiro-based thermally activated delayed fluorescence emitters with reduced nonradiative decay for high-quantum-efficiency, low-roll-off, organic light-emitting diodes

AU - Sharma, Nidhi

AU - Maciejczyk, Michal

AU - Hall, David

AU - Li, Wenbo

AU - Liégeois, Vincent

AU - Beljonne, David

AU - Olivier, Yoann

AU - Robertson, Neil

AU - Samuel, Ifor D. W.

AU - Zysman-Colman, Eli

N1 - E.Z.-C. thanks the Leverhulme Trust (No. RPG-2016-047) and the University of St Andrews for support. The authors are grateful to the EPSRC for financial support (grants EP/ P007805/1, EP/P010482/1, EP/L017008/1, EP/J01771X, and EP/J00916). M.M. thanks the Innovation Programme H2020-MSCA-IF-2014-659237 for financial support. W.L. thanks the China Scholarship Council (grant number 201708060003). V.L. thanks the F.R.S.-FNRS for his Research Associate position. Computational resources have been provided by the Consortium des É quipements de Calcul Intensif (CÉ CI), funded by the Fonds de la Recherche Scientifiques de Belgique (F.R.S.FNRS) under Grant No. 2.5020.11, GEQ U.G006.15, 1610468, and RW/GEQ. (2016). D.B. is an FNRS Research Director.

PY - 2021/9/13

Y1 - 2021/9/13

N2 - Herein, we report the use of spiro-configured fluorene-xanthene scaffolds as a novel, promising, and effective strategy in thermally activated delayed fluorescence (TADF) emitter design to attain high photoluminescence quantum yields (ΦPL), short delayed luminescence lifetime, high external quantum efficiency (EQE), and minimum efficiency roll-off characteristics in organic light-emitting diodes (OLEDs). The optoelectronic and electroluminescence properties of SFX (spiro-(fluorene-9,9′-xanthene))-based emitters (SFX-PO-DPA, SFX-PO-DPA-Me, and SFX-PO-DPA-OMe) were investigated both theoretically and experimentally. All three emitters exhibited sky blue to green emission enabled by a Herzberg–Teller mechanism in the excited state. They possess short excited-state delayed lifetimes (<10 μs), high photoluminescence quantum yields (ΦPL ∼ 70%), and small singlet–triplet splitting energies (ΔEST < 0.10 eV) in the doped films in an mCP host matrix. The OLEDs showed some of the highest EQEs using spiro-containing emitters where maximum external quantum efficiencies (EQEmax) of 11 and 16% were obtained for devices using SFX-PO-DPA and SFX-PO-DPA-OMe, respectively. Further, a record EQEmax of 23% for a spiro-based emitter coupled with a low efficiency roll-off (19% at 100 cd m–2) was attained with SFX-PO-DPA-Me.

AB - Herein, we report the use of spiro-configured fluorene-xanthene scaffolds as a novel, promising, and effective strategy in thermally activated delayed fluorescence (TADF) emitter design to attain high photoluminescence quantum yields (ΦPL), short delayed luminescence lifetime, high external quantum efficiency (EQE), and minimum efficiency roll-off characteristics in organic light-emitting diodes (OLEDs). The optoelectronic and electroluminescence properties of SFX (spiro-(fluorene-9,9′-xanthene))-based emitters (SFX-PO-DPA, SFX-PO-DPA-Me, and SFX-PO-DPA-OMe) were investigated both theoretically and experimentally. All three emitters exhibited sky blue to green emission enabled by a Herzberg–Teller mechanism in the excited state. They possess short excited-state delayed lifetimes (<10 μs), high photoluminescence quantum yields (ΦPL ∼ 70%), and small singlet–triplet splitting energies (ΔEST < 0.10 eV) in the doped films in an mCP host matrix. The OLEDs showed some of the highest EQEs using spiro-containing emitters where maximum external quantum efficiencies (EQEmax) of 11 and 16% were obtained for devices using SFX-PO-DPA and SFX-PO-DPA-OMe, respectively. Further, a record EQEmax of 23% for a spiro-based emitter coupled with a low efficiency roll-off (19% at 100 cd m–2) was attained with SFX-PO-DPA-Me.

KW - Spiro

KW - Fluorene-xanthen

KW - Herzberg-Teller

KW - TADF

KW - Luminescence

KW - OLEDs

U2 - 10.1021/acsami.1c12234

DO - 10.1021/acsami.1c12234

M3 - Article

SN - 1944-8244

VL - Articles ASAP

JO - ACS Applied Materials & Interfaces

JF - ACS Applied Materials & Interfaces

ER -

Spiro-based thermally activated delayed fluorescence emitters with reduced nonradiative decay for high-quantum-efficiency, low-roll-off, organic light-emitting diodes

Abstract

Keywords

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Projects

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

Blue-Emitting TADF Materials: Blue-Emitting TADF Materials for OLEDs Based on a Lewis Acid-Containing Acceptor

Equipment Account: Characterisation and Manipulation of Advanced Functional Materials and their Interfaces at the Nanoscale

Datasets

Spiro-based Thermally Activated Delayed Fluorescence Emitters with Reduced Non-radiative Decay for High Quantum Efficiency, Low Roll-off, Organic Light-Emitting Diodes (dataset)

Cite this