Direct observation of intersystem crossing in a thermally activated delayed fluorescence copper complex in the solid state

Larissa Bergmann; Gordon James Hedley; Thomas Baumann; Stefan Braese; Ifor David William Samuel

doi:10.1126/sciadv.1500889

Direct observation of intersystem crossing in a thermally activated delayed fluorescence copper complex in the solid state

Larissa Bergmann, Gordon James Hedley, Thomas Baumann, Stefan Braese, Ifor David William Samuel

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

Abstract

Intersystem crossing in thermally activated delayed fluorescence (TADF) materials is an important process that controls the rate at which singlet states convert to triplets; however, measuring this directly in TADF materials is difficult. TADF is a significant emerging technology that enables the harvesting of triplets as well as singlet excited states for emission in organic light emitting diodes. We have observed the picosecond time-resolved photoluminescence of a highly luminescent, neutral copper(I) complex in the solid state that shows TADF. The time constant of intersystem crossing is measured to be 27 picoseconds. Subsequent overall reverse intersystem crossing is slow, leading to population equilibration and TADF with an average lifetime of 11.5 microseconds. These first measurements of intersystem crossing in the solid state in this class of mononuclear copper(I) complexes give a better understanding of the excited-state processes and mechanisms that ensure efficient TADF.

Original language	English
Article number	e1500889
Number of pages	7
Journal	Science Advances
Volume	2
Issue number	1
DOIs	https://doi.org/10.1126/sciadv.1500889
Publication status	Published - 1 Jan 2016

Keywords

Thermally-activated delayed fluorescence
Organic light-emitting diode
Copper complex
Intersystem crossing
Time-resolved photoluminescence

Access to Document

10.1126/sciadv.1500889Licence: CC BY

bergmann_ScienceAdvances_e1500889_CC
Copyright © 2016, The Authors. This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Final published version, 552 KBLicence: CC BY

ERC Advanced Grant EXCITON: EU FP7 ERC Advanced Grant 2012 EXCITON
Samuel, I. D. W. (PI)
European Research Council
1/04/13 → 30/03/19
Project: Standard
The Influence of Excited State Physics: The influence of Excited State Physics in Conjugated Polymer Devices
Samuel, I. D. W. (PI)
EPSRC
1/10/12 → 30/09/15
Project: Standard

Ifor David William Samuel
- idwsst-andrews.acuk
Person: Academic

Data underpinning - Direct observation of intersystem crossing in a Thermally Activated Delayed Florescence copper complex in the solid state
Bergmann, L. (Creator), Hedley, G. J. (Creator), Baumann, T. (Creator), Braese, S. (Creator) & Samuel, I. D. W. (Creator), University of St Andrews, 2015
DOI: 10.17630/75927659-2F66-4174-96E2-C73E76CF1941
Dataset

File

Cite this

@article{836e417e9afd47b59bfb92b9406c0fae,

title = "Direct observation of intersystem crossing in a thermally activated delayed fluorescence copper complex in the solid state",

abstract = "Intersystem crossing in thermally activated delayed fluorescence (TADF) materials is an important process that controls the rate at which singlet states convert to triplets; however, measuring this directly in TADF materials is difficult. TADF is a significant emerging technology that enables the harvesting of triplets as well as singlet excited states for emission in organic light emitting diodes. We have observed the picosecond time-resolved photoluminescence of a highly luminescent, neutral copper(I) complex in the solid state that shows TADF. The time constant of intersystem crossing is measured to be 27 picoseconds. Subsequent overall reverse intersystem crossing is slow, leading to population equilibration and TADF with an average lifetime of 11.5 microseconds. These first measurements of intersystem crossing in the solid state in this class of mononuclear copper(I) complexes give a better understanding of the excited-state processes and mechanisms that ensure efficient TADF.",

keywords = "Thermally-activated delayed fluorescence, Organic light-emitting diode, Copper complex, Intersystem crossing, Time-resolved photoluminescence",

author = "Larissa Bergmann and Hedley, {Gordon James} and Thomas Baumann and Stefan Braese and Samuel, {Ifor David William}",

note = "The authors are grateful to CYNORA GmbH for financial support. This work was supported by the Engineering and Physical Sciences Research Council (grant number EP/J009016/1) and by the European Union Seventh Framework Programme under grant agreement 321305. ",

year = "2016",

month = jan,

day = "1",

doi = "10.1126/sciadv.1500889",

language = "English",

volume = "2",

journal = "Science Advances",

issn = "2375-2548",

publisher = "American Association for the Advancement of Science",

number = "1",

}

TY - JOUR

T1 - Direct observation of intersystem crossing in a thermally activated delayed fluorescence copper complex in the solid state

AU - Bergmann, Larissa

AU - Hedley, Gordon James

AU - Baumann, Thomas

AU - Braese, Stefan

AU - Samuel, Ifor David William

N1 - The authors are grateful to CYNORA GmbH for financial support. This work was supported by the Engineering and Physical Sciences Research Council (grant number EP/J009016/1) and by the European Union Seventh Framework Programme under grant agreement 321305.

PY - 2016/1/1

Y1 - 2016/1/1

N2 - Intersystem crossing in thermally activated delayed fluorescence (TADF) materials is an important process that controls the rate at which singlet states convert to triplets; however, measuring this directly in TADF materials is difficult. TADF is a significant emerging technology that enables the harvesting of triplets as well as singlet excited states for emission in organic light emitting diodes. We have observed the picosecond time-resolved photoluminescence of a highly luminescent, neutral copper(I) complex in the solid state that shows TADF. The time constant of intersystem crossing is measured to be 27 picoseconds. Subsequent overall reverse intersystem crossing is slow, leading to population equilibration and TADF with an average lifetime of 11.5 microseconds. These first measurements of intersystem crossing in the solid state in this class of mononuclear copper(I) complexes give a better understanding of the excited-state processes and mechanisms that ensure efficient TADF.

AB - Intersystem crossing in thermally activated delayed fluorescence (TADF) materials is an important process that controls the rate at which singlet states convert to triplets; however, measuring this directly in TADF materials is difficult. TADF is a significant emerging technology that enables the harvesting of triplets as well as singlet excited states for emission in organic light emitting diodes. We have observed the picosecond time-resolved photoluminescence of a highly luminescent, neutral copper(I) complex in the solid state that shows TADF. The time constant of intersystem crossing is measured to be 27 picoseconds. Subsequent overall reverse intersystem crossing is slow, leading to population equilibration and TADF with an average lifetime of 11.5 microseconds. These first measurements of intersystem crossing in the solid state in this class of mononuclear copper(I) complexes give a better understanding of the excited-state processes and mechanisms that ensure efficient TADF.

KW - Thermally-activated delayed fluorescence

KW - Organic light-emitting diode

KW - Copper complex

KW - Intersystem crossing

KW - Time-resolved photoluminescence

U2 - 10.1126/sciadv.1500889

DO - 10.1126/sciadv.1500889

M3 - Article

SN - 2375-2548

VL - 2

JO - Science Advances

JF - Science Advances

IS - 1

M1 - e1500889

ER -

Direct observation of intersystem crossing in a thermally activated delayed fluorescence copper complex in the solid state

Abstract

Keywords

Access to Document

Fingerprint

Projects

ERC Advanced Grant EXCITON: EU FP7 ERC Advanced Grant 2012 EXCITON

The Influence of Excited State Physics: The influence of Excited State Physics in Conjugated Polymer Devices

Profiles

Ifor David William Samuel

Datasets

Data underpinning - Direct observation of intersystem crossing in a Thermally Activated Delayed Florescence copper complex in the solid state

Cite this