St Andrews Research Repository

St Andrews University Home
View Item 
  •   St Andrews Research Repository
  • University of St Andrews Research
  • University of St Andrews Research
  • University of St Andrews Research
  • View Item
  •   St Andrews Research Repository
  • University of St Andrews Research
  • University of St Andrews Research
  • University of St Andrews Research
  • View Item
  •   St Andrews Research Repository
  • University of St Andrews Research
  • University of St Andrews Research
  • University of St Andrews Research
  • View Item
  • Login
JavaScript is disabled for your browser. Some features of this site may not work without it.

Deep-blue thermally activated delayed fluorescence (TADF) emitters for light-emitting electrochemical cells (LEECs)

Thumbnail
View/Open
BTL_draft_ver_11.pdf (1.679Mb)
Date
21/02/2017
Author
Wong, Michael Y.
La-Placa, Maria-Grazia
Pertegás, Antonio
Bolink, Henk J.
Zysman-Colman, Eli
Funder
EPSRC
EPSRC
Grant ID
EP/M02105X/1
EP/P010482/1
Keywords
QD Chemistry
DAS
Metadata
Show full item record
Altmetrics Handle Statistics
Altmetrics DOI Statistics
Abstract
Two deep blue thermally activated delayed fluorescence (TADF) emitters ( imCzDPS and imDPADPS ) that contain charged imidazolium groups tethered to the central luminophore were designed and synthesized as small molecule organic emitters for light-emitting electrochemical cell (LEEC) electroluminescent devices. The emission profile in doped thin films (5 wt% in PMMA) is very blue and narrow (λPL: 414 nm and 409 nm; full width at half maximum (FHWM): 62 nm and 46 nm for imCzDPS and imDPADPS , respectively) with good photoluminescence quantum efficiencies (ФPL: 44% and 49% for imCzDPS and imDPADPS , respectively). In neat films, emission maxima occur at 440 nm and 428 nm for imCzDPS and imDPADPS , respectively with comparable ΦPL values of 44 and 61%, respectively. Both emitters exhibit biexponential emission decay kinetics (nanosecond prompt and microsecond delayed fluorescence) in both MeCN solution and thin film, characteristic of TADF behaviour. While imDPADPS did not show any emission in the LEEC device, that of imCzDPS gave an electroluminescence (EL) maximum at 470 nm and CIE coordinates of (0.208, 0.250), which makes this device amongst the bluest reported to date. However, the maximum device luminance achieved was 2.5 cd m-2 and this poor brightness was attributed to the electrochemical instability of the emitter in LEEC architecture, as evidenced by the additional peak around 550 nm observed in the EL spectrum.
Citation
Wong , M Y , La-Placa , M-G , Pertegás , A , Bolink , H J & Zysman-Colman , E 2017 , ' Deep-blue thermally activated delayed fluorescence (TADF) emitters for light-emitting electrochemical cells (LEECs) ' , Journal of Materials Chemistry C , vol. 5 , no. 7 , pp. 1699-1705 . https://doi.org/10.1039/C6TC04821H
Publication
Journal of Materials Chemistry C
Status
Peer reviewed
DOI
https://doi.org/10.1039/C6TC04821H
ISSN
2050-7526
Type
Journal article
Rights
© 2017 the Authors. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version 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/C6TC04821H
Description
The authors acknowledge the University of St Andrews for financial support. The authors also acknowledge financial support from the European Union H2020 project INFORM (grant 675867), the Spanish Ministry of Economy and Competitiveness (MINECO) via the Unidad de Excelencia María de Maeztu MDM-2015-0538, MAT2014-55200 and the Generalitat Valenciana (Prometeo/2016/135). MLP acknowledges support from a Grisolia grant (GRISOLIA/2015/A/146).
Collections
  • University of St Andrews Research
URL
http://www.rsc.org/suppdata/c6/tc/c6tc04821h/c6tc04821h1.pdf
URI
http://hdl.handle.net/10023/12495

Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.

Advanced Search

Browse

All of RepositoryCommunities & CollectionsBy Issue DateNamesTitlesSubjectsClassificationTypeFunderThis CollectionBy Issue DateNamesTitlesSubjectsClassificationTypeFunder

My Account

Login

Open Access

To find out how you can benefit from open access to research, see our library web pages and Open Access blog. For open access help contact: openaccess@st-andrews.ac.uk.

Accessibility

Read our Accessibility statement.

How to submit research papers

The full text of research papers can be submitted to the repository via Pure, the University's research information system. For help see our guide: How to deposit in Pure.

Electronic thesis deposit

Help with deposit.

Repository help

For repository help contact: Digital-Repository@st-andrews.ac.uk.

Give Feedback

Cookie policy

This site may use cookies. Please see Terms and Conditions.

Usage statistics

COUNTER-compliant statistics on downloads from the repository are available from the IRUS-UK Service. Contact us for information.

© University of St Andrews Library

University of St Andrews is a charity registered in Scotland, No SC013532.

  • Facebook
  • Twitter