High performance non-doped green organic light emitting diode via delayed fluorescence

Bahadur Sk; Vasudevan Thangaraji; Nisha Yadav; Gyana Prakash Nanda; Sannibha Das; Parthasarathy Gandeepan; Eli Zysman-Colman; Pachaiyappan Rajamalli

doi:10.1039/D1TC03849D

High performance non-doped green organic light emitting diode via delayed fluorescence

Bahadur Sk, Vasudevan Thangaraji, Nisha Yadav, Gyana Prakash Nanda, Sannibha Das, Parthasarathy Gandeepan, Eli Zysman-Colman^*, Pachaiyappan Rajamalli^*

^*Corresponding author for this work

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

Abstract

Non-doped, delayed fluorescence organic light-emitting diodes (OLEDs) provide a route to high performance devices and simplified device fabrication. Here, two ambipolar anthracene derivatives containing a hole-transporting di-p-tolylamine and a carbazole and an electron-transporting phosphine oxide moiety are rationally designed and synthesized. The thermal and optoelectronic properties were investigated and the neat films of these compounds show high photoluminescence quantum yields of 84–87%. Non-doped OLEDs with these luminogens exhibit green emission at ∼545 nm and an EQE_max of over 7.2% due to the delayed fluorescence resulting from triplet–triplet annihilation (TTA). The devices show a high luminance of over 104 400 cd m⁻². Power efficiency and current efficiency maxima are up to 23.0 lm W⁻¹ and 28.3 cd A⁻¹, respectively. Moreover, the devices show very low efficiency roll-off and retain 90% of the maximum efficiency even at 20 000 cd m⁻². When combined with a thermally activated delayed fluorescent (TADF) assistant dopant, the green-emitting OLEDs show a high EQE_max of 17.8%.

Original language	English
Pages (from-to)	15583-15590
Number of pages	8
Journal	Journal of Materials Chemistry C
Volume	2021
Issue number	43
Early online date	14 Oct 2021
DOIs	https://doi.org/10.1039/D1TC03849D
Publication status	Published - 21 Nov 2021

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Copyright © 2021 The Author(s). 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/10.1039/D1TC03849D
Accepted author manuscript, 1.76 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

CCDC 1580567: Experimental Crystal Structure Determination
Sk, B. (Contributor), Thangaraji, V. (Contributor), Yadav, N. (Contributor), Nanda, G. P. (Contributor), Das, S. (Contributor), Gandeepan, P. (Contributor), Zysman-Colman, E. (Contributor) & Rajamalli, P. (Contributor), The Cambridge Structural Database, 17 Oct 2017
DOI: 10.5517/ccdc.csd.cc1q1q1j
Dataset

Cite this

@article{8b8faf61ab4e4487801f51737e0d22cd,

title = "High performance non-doped green organic light emitting diode via delayed fluorescence",

abstract = "Non-doped, delayed fluorescence organic light-emitting diodes (OLEDs) provide a route to high performance devices and simplified device fabrication. Here, two ambipolar anthracene derivatives containing a hole-transporting di-p-tolylamine and a carbazole and an electron-transporting phosphine oxide moiety are rationally designed and synthesized. The thermal and optoelectronic properties were investigated and the neat films of these compounds show high photoluminescence quantum yields of 84–87%. Non-doped OLEDs with these luminogens exhibit green emission at ∼545 nm and an EQEmax of over 7.2% due to the delayed fluorescence resulting from triplet–triplet annihilation (TTA). The devices show a high luminance of over 104 400 cd m−2. Power efficiency and current efficiency maxima are up to 23.0 lm W−1 and 28.3 cd A−1, respectively. Moreover, the devices show very low efficiency roll-off and retain 90% of the maximum efficiency even at 20 000 cd m−2. When combined with a thermally activated delayed fluorescent (TADF) assistant dopant, the green-emitting OLEDs show a high EQEmax of 17.8%. ",

author = "Bahadur Sk and Vasudevan Thangaraji and Nisha Yadav and Nanda, {Gyana Prakash} and Sannibha Das and Parthasarathy Gandeepan and Eli Zysman-Colman and Pachaiyappan Rajamalli",

note = "Funding: P. G. thanks the Science & Engineering Research Board (SERB), India, for the Start-up Research Grant (SRG) (Grant No: SRG/2020/000161). E.Z-C. thanks the Engineering and Physical Sciences Research Council (EPSRC) EP/P010482/1 and Royal Society Leverhulme Trust Senior Research fellow (SRF\R1\20108 for support. P. R. thanks the Indian Institute of Science (IISc) for generous financial support and the Science & Engineering Research Board (SERB), India, for the SERB-Power Grant (SPG) (Grant No: SPG/2020/000107). B.S. thank IISc for the C. V. Raman Fellowship under the Institute of Eminence (IoE).",

year = "2021",

month = nov,

day = "21",

doi = "10.1039/D1TC03849D",

language = "English",

volume = "2021",

pages = "15583--15590",

journal = "Journal of Materials Chemistry C",

issn = "2050-7526",

publisher = "ROYAL SOC CHEMISTRY",

number = "43",

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T1 - High performance non-doped green organic light emitting diode via delayed fluorescence

AU - Sk, Bahadur

AU - Thangaraji, Vasudevan

AU - Yadav, Nisha

AU - Nanda, Gyana Prakash

AU - Das, Sannibha

AU - Gandeepan, Parthasarathy

AU - Zysman-Colman, Eli

AU - Rajamalli, Pachaiyappan

N1 - Funding: P. G. thanks the Science & Engineering Research Board (SERB), India, for the Start-up Research Grant (SRG) (Grant No: SRG/2020/000161). E.Z-C. thanks the Engineering and Physical Sciences Research Council (EPSRC) EP/P010482/1 and Royal Society Leverhulme Trust Senior Research fellow (SRF\R1\20108 for support. P. R. thanks the Indian Institute of Science (IISc) for generous financial support and the Science & Engineering Research Board (SERB), India, for the SERB-Power Grant (SPG) (Grant No: SPG/2020/000107). B.S. thank IISc for the C. V. Raman Fellowship under the Institute of Eminence (IoE).

PY - 2021/11/21

Y1 - 2021/11/21

N2 - Non-doped, delayed fluorescence organic light-emitting diodes (OLEDs) provide a route to high performance devices and simplified device fabrication. Here, two ambipolar anthracene derivatives containing a hole-transporting di-p-tolylamine and a carbazole and an electron-transporting phosphine oxide moiety are rationally designed and synthesized. The thermal and optoelectronic properties were investigated and the neat films of these compounds show high photoluminescence quantum yields of 84–87%. Non-doped OLEDs with these luminogens exhibit green emission at ∼545 nm and an EQEmax of over 7.2% due to the delayed fluorescence resulting from triplet–triplet annihilation (TTA). The devices show a high luminance of over 104 400 cd m−2. Power efficiency and current efficiency maxima are up to 23.0 lm W−1 and 28.3 cd A−1, respectively. Moreover, the devices show very low efficiency roll-off and retain 90% of the maximum efficiency even at 20 000 cd m−2. When combined with a thermally activated delayed fluorescent (TADF) assistant dopant, the green-emitting OLEDs show a high EQEmax of 17.8%.

AB - Non-doped, delayed fluorescence organic light-emitting diodes (OLEDs) provide a route to high performance devices and simplified device fabrication. Here, two ambipolar anthracene derivatives containing a hole-transporting di-p-tolylamine and a carbazole and an electron-transporting phosphine oxide moiety are rationally designed and synthesized. The thermal and optoelectronic properties were investigated and the neat films of these compounds show high photoluminescence quantum yields of 84–87%. Non-doped OLEDs with these luminogens exhibit green emission at ∼545 nm and an EQEmax of over 7.2% due to the delayed fluorescence resulting from triplet–triplet annihilation (TTA). The devices show a high luminance of over 104 400 cd m−2. Power efficiency and current efficiency maxima are up to 23.0 lm W−1 and 28.3 cd A−1, respectively. Moreover, the devices show very low efficiency roll-off and retain 90% of the maximum efficiency even at 20 000 cd m−2. When combined with a thermally activated delayed fluorescent (TADF) assistant dopant, the green-emitting OLEDs show a high EQEmax of 17.8%.

U2 - 10.1039/D1TC03849D

DO - 10.1039/D1TC03849D

M3 - Article

SN - 2050-7526

VL - 2021

SP - 15583

EP - 15590

JO - Journal of Materials Chemistry C

JF - Journal of Materials Chemistry C

IS - 43

ER -

High performance non-doped green organic light emitting diode via delayed fluorescence

Abstract

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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

Datasets

CCDC 1580567: Experimental Crystal Structure Determination

Cite this