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Article: Using magneto-electroluminescence as a fingerprint to identify the carrier-to-photon conversion process in dye-doped OLEDs

TitleUsing magneto-electroluminescence as a fingerprint to identify the carrier-to-photon conversion process in dye-doped OLEDs
Authors
Issue Date2011
PublisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/journals/jpccck/
Citation
Journal of Physical Chemistry C, 2011, v. 115 n. 41, p. 20295-20300 How to Cite?
AbstractLong-range Förster energy transfer (FET) and short-range charge trapping (CT) are two competing basic mechanisms in the carrier-to-photon process of dye-doped organic diode, but little is known about which of FET and CT governs the electroluminescence process for a given dye. Here we report that magneto-electroluminescence (MEL) response can serve to identify the fundamental issue. (1) In relative high magnetic field (>20 mT), dramatic decrease in MEL response implies that CT dominates carrier-to-photon process for a common fluorescent dye of 4-(dicyano-methylene)-2-methyl-6-(p-dimethylaminostyryl)-4H- pyran (DCM1), whereas saturating of MEL response indicates that FET is dominant for another common fluorescent dye of Coumarin 540 (C540). (2) In low field (<15 mT), overlapping between MEL responses of DCM1-doped and control OLED shows that prior to being trapped by DCM1 molecule, electron and hole have formed electrostatically bound e-h polaron pair in adjacent Alq 3 molecules. Both of the observations are finally confirmed by intermolecular correlated quantum calculation. © 2011 American Chemical Society.
Persistent Identifierhttp://hdl.handle.net/10722/155679
ISSN
2015 Impact Factor: 4.509
2015 SCImago Journal Rankings: 1.995
ISI Accession Number ID
Funding AgencyGrant Number
Research Grants Council of the HK Special Administrative Region, China712108
712010E
UGC of HKU21476020
10401466
National Science Foundation of China
Shanghai Science and Technology Commission08JC1402300
MST of China2009CB929200
HKU
Funding Information:

We acknowledge the financial support of grants (HKU#712108, HKU#712010E) from the Research Grants Council of the HK Special Administrative Region, China, UGC of HKU (21476020, 10401466) and the National Science Foundation of China and Shanghai Science and Technology Commission (grant no. 08JC1402300), and the MST of China (grant no. 2009CB929200). B.-F.D. acknowledges the support of Engineering Postdoctoral Fellowship, HKU. We thank Yi-Ping Sun for her proofreading.

References

 

DC FieldValueLanguage
dc.contributor.authorDing, BFen_US
dc.contributor.authorYao, Yen_US
dc.contributor.authorWu, CQen_US
dc.contributor.authorHou, XYen_US
dc.contributor.authorChoy, WCHen_US
dc.date.accessioned2012-08-08T08:34:48Z-
dc.date.available2012-08-08T08:34:48Z-
dc.date.issued2011en_US
dc.identifier.citationJournal of Physical Chemistry C, 2011, v. 115 n. 41, p. 20295-20300en_US
dc.identifier.issn1932-7447en_US
dc.identifier.urihttp://hdl.handle.net/10722/155679-
dc.description.abstractLong-range Förster energy transfer (FET) and short-range charge trapping (CT) are two competing basic mechanisms in the carrier-to-photon process of dye-doped organic diode, but little is known about which of FET and CT governs the electroluminescence process for a given dye. Here we report that magneto-electroluminescence (MEL) response can serve to identify the fundamental issue. (1) In relative high magnetic field (>20 mT), dramatic decrease in MEL response implies that CT dominates carrier-to-photon process for a common fluorescent dye of 4-(dicyano-methylene)-2-methyl-6-(p-dimethylaminostyryl)-4H- pyran (DCM1), whereas saturating of MEL response indicates that FET is dominant for another common fluorescent dye of Coumarin 540 (C540). (2) In low field (<15 mT), overlapping between MEL responses of DCM1-doped and control OLED shows that prior to being trapped by DCM1 molecule, electron and hole have formed electrostatically bound e-h polaron pair in adjacent Alq 3 molecules. Both of the observations are finally confirmed by intermolecular correlated quantum calculation. © 2011 American Chemical Society.en_US
dc.languageengen_US
dc.publisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/journals/jpccck/en_US
dc.relation.ispartofJournal of Physical Chemistry Cen_US
dc.titleUsing magneto-electroluminescence as a fingerprint to identify the carrier-to-photon conversion process in dye-doped OLEDsen_US
dc.typeArticleen_US
dc.identifier.emailChoy, WCH:chchoy@eee.hku.hken_US
dc.identifier.authorityChoy, WCH=rp00218en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1021/jp2045838en_US
dc.identifier.scopuseid_2-s2.0-80054771155en_US
dc.identifier.hkuros208045-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-80054771155&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume115en_US
dc.identifier.issue41en_US
dc.identifier.spage20295en_US
dc.identifier.epage20300en_US
dc.identifier.isiWOS:000295700800032-
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridDing, BF=16309026400en_US
dc.identifier.scopusauthoridYao, Y=8918961600en_US
dc.identifier.scopusauthoridWu, CQ=8601010500en_US
dc.identifier.scopusauthoridHou, XY=13405684400en_US
dc.identifier.scopusauthoridChoy, WCH=7006202371en_US

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