Using Magneto-Electroluminescence As a Fingerprint to Identify the Carrier-to-Photon Conversion Process in Dye-Doped OLEDs

Long-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 ma...

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Bibliographic Details
Published in:Journal of physical chemistry. C 2011-10, Vol.115 (41), p.20295-20300
Main Authors: Ding, B. F, Yao, Y, Wu, C. Q, Hou, X. Y, Choy, W. C. H
Format: Article
Language:English
Subjects:
C: Electron Transport, Optical and Electronic Devices, Hard Matter
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Summary:Long-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 (
ISSN:1932-7447
1932-7455
DOI:10.1021/jp2045838