Exciton efficiency beyond the spin statistical limit in organic light emitting diodes based on anthracene derivatives

Nidhi Sharma; Michael Yin Wong; David Hall; Eduard Spuling; Francisco Tenopala-Carmona; Alberto Privitera; Graeme Copley; David B. Cordes; Alexandra M.Z. Slawin; Caroline Murawski; Malte C. Gather; David Beljonne; Yoann Olivier; Ifor D.W. Samuel; Eli Zysman-Colman

doi:10.1039/c9tc06356k

Exciton efficiency beyond the spin statistical limit in organic light emitting diodes based on anthracene derivatives

Nidhi Sharma, Michael Yin Wong, David Hall, Eduard Spuling, Francisco Tenopala-Carmona, Alberto Privitera, Graeme Copley, David B. Cordes, Alexandra M.Z. Slawin, Caroline Murawski, Malte C. Gather, David Beljonne, Yoann Olivier, Ifor D.W. Samuel, Eli Zysman-Colman

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Abstract

We report two donor-acceptor (D-A) materials based on a cyanoanthracene acceptor paired with diphenylamine (DPAAnCN) and carbazole (CzAnCN) donor moieties. These compounds show hybrid locally excited (LE) charge-transfer (CT) excited states (HLCT), which we demonstrated through a combined photophysical and computational study. Vacuum-deposited organic light emitting diodes (OLEDs) using these HLCT emitters exhibit maximum external quantum efficiencies (EQE_max) close to 6%, with impressive exciton utilization efficiency (Φ_s) of >50%, far exceeding the spin statistic limit of 25%. We rule out triplet-triplet annihilation and thermally activated delayed fluorescence as triplet harvesting mechanisms along with horizontal orientation of emitters to enhance light outcoupling and, instead, propose a "hot exciton" channel involving the nearly isoenergetic T₂ and S₁ states.

Original language	English
Pages (from-to)	3773-3783
Number of pages	11
Journal	Journal of Materials Chemistry C
Volume	8
Issue number	11
DOIs	https://doi.org/10.1039/c9tc06356k
Publication status	Published - 21 Mar 2020

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2020_OlivierY_articleAccepted author manuscript, 1.47 MB

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Sharma, N., Wong, M. Y., Hall, D., Spuling, E., Tenopala-Carmona, F., Privitera, A., Copley, G., Cordes, D. B., Slawin, A. M. Z., Murawski, C., Gather, M. C., Beljonne, D., Olivier, Y., Samuel, I. D. W., & Zysman-Colman, E. (2020). Exciton efficiency beyond the spin statistical limit in organic light emitting diodes based on anthracene derivatives. Journal of Materials Chemistry C, 8(11), 3773-3783. https://doi.org/10.1039/c9tc06356k

@article{dd0562d1e7da4bd38ec28b830ab5a1ba,

title = "Exciton efficiency beyond the spin statistical limit in organic light emitting diodes based on anthracene derivatives",

abstract = "We report two donor-acceptor (D-A) materials based on a cyanoanthracene acceptor paired with diphenylamine (DPAAnCN) and carbazole (CzAnCN) donor moieties. These compounds show hybrid locally excited (LE) charge-transfer (CT) excited states (HLCT), which we demonstrated through a combined photophysical and computational study. Vacuum-deposited organic light emitting diodes (OLEDs) using these HLCT emitters exhibit maximum external quantum efficiencies (EQEmax) close to 6%, with impressive exciton utilization efficiency (Φs) of >50%, far exceeding the spin statistic limit of 25%. We rule out triplet-triplet annihilation and thermally activated delayed fluorescence as triplet harvesting mechanisms along with horizontal orientation of emitters to enhance light outcoupling and, instead, propose a {"}hot exciton{"} channel involving the nearly isoenergetic T2 and S1 states.",

author = "Nidhi Sharma and Wong, {Michael Yin} and David Hall and Eduard Spuling and Francisco Tenopala-Carmona and Alberto Privitera and Graeme Copley and Cordes, {David B.} and Slawin, {Alexandra M.Z.} and Caroline Murawski and Gather, {Malte C.} and David Beljonne and Yoann Olivier and Samuel, {Ifor D.W.} and Eli Zysman-Colman",

year = "2020",

month = mar,

day = "21",

doi = "10.1039/c9tc06356k",

language = "English",

volume = "8",

pages = "3773--3783",

journal = "Journal of Materials Chemistry C",

issn = "2050-7534",

publisher = "Royal Society of Chemistry",

number = "11",

}

Sharma, N, Wong, MY, Hall, D, Spuling, E, Tenopala-Carmona, F, Privitera, A, Copley, G, Cordes, DB, Slawin, AMZ, Murawski, C, Gather, MC, Beljonne, D, Olivier, Y, Samuel, IDW & Zysman-Colman, E 2020, 'Exciton efficiency beyond the spin statistical limit in organic light emitting diodes based on anthracene derivatives', Journal of Materials Chemistry C, vol. 8, no. 11, pp. 3773-3783. https://doi.org/10.1039/c9tc06356k

TY - JOUR

T1 - Exciton efficiency beyond the spin statistical limit in organic light emitting diodes based on anthracene derivatives

AU - Sharma, Nidhi

AU - Wong, Michael Yin

AU - Hall, David

AU - Spuling, Eduard

AU - Tenopala-Carmona, Francisco

AU - Privitera, Alberto

AU - Copley, Graeme

AU - Cordes, David B.

AU - Slawin, Alexandra M.Z.

AU - Murawski, Caroline

AU - Gather, Malte C.

AU - Beljonne, David

AU - Olivier, Yoann

AU - Samuel, Ifor D.W.

AU - Zysman-Colman, Eli

PY - 2020/3/21

Y1 - 2020/3/21

N2 - We report two donor-acceptor (D-A) materials based on a cyanoanthracene acceptor paired with diphenylamine (DPAAnCN) and carbazole (CzAnCN) donor moieties. These compounds show hybrid locally excited (LE) charge-transfer (CT) excited states (HLCT), which we demonstrated through a combined photophysical and computational study. Vacuum-deposited organic light emitting diodes (OLEDs) using these HLCT emitters exhibit maximum external quantum efficiencies (EQEmax) close to 6%, with impressive exciton utilization efficiency (Φs) of >50%, far exceeding the spin statistic limit of 25%. We rule out triplet-triplet annihilation and thermally activated delayed fluorescence as triplet harvesting mechanisms along with horizontal orientation of emitters to enhance light outcoupling and, instead, propose a "hot exciton" channel involving the nearly isoenergetic T2 and S1 states.

AB - We report two donor-acceptor (D-A) materials based on a cyanoanthracene acceptor paired with diphenylamine (DPAAnCN) and carbazole (CzAnCN) donor moieties. These compounds show hybrid locally excited (LE) charge-transfer (CT) excited states (HLCT), which we demonstrated through a combined photophysical and computational study. Vacuum-deposited organic light emitting diodes (OLEDs) using these HLCT emitters exhibit maximum external quantum efficiencies (EQEmax) close to 6%, with impressive exciton utilization efficiency (Φs) of >50%, far exceeding the spin statistic limit of 25%. We rule out triplet-triplet annihilation and thermally activated delayed fluorescence as triplet harvesting mechanisms along with horizontal orientation of emitters to enhance light outcoupling and, instead, propose a "hot exciton" channel involving the nearly isoenergetic T2 and S1 states.

UR - http://www.scopus.com/inward/record.url?scp=85082297917&partnerID=8YFLogxK

U2 - 10.1039/c9tc06356k

DO - 10.1039/c9tc06356k

M3 - Article

AN - SCOPUS:85082297917

SN - 2050-7534

VL - 8

SP - 3773

EP - 3783

JO - Journal of Materials Chemistry C

JF - Journal of Materials Chemistry C

IS - 11

ER -

Exciton efficiency beyond the spin statistical limit in organic light emitting diodes based on anthracene derivatives

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CCDC 1960942: Experimental Crystal Structure Determination

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Exciton efficiency beyond the spin statistical limit in organic light emitting diodes based on anthracene derivatives

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CCDC 1960941: Experimental Crystal Structure Determination

CCDC 1960942: Experimental Crystal Structure Determination

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