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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/3343
Title: The use of a polarity matching and high-energy exciton generating host in fabricating efficient purplish-blue OLEDs from a sky-blue emitter
Authors: Jou J.-H.
Chen Y.-L.
Tseng J.-R.
Wu R.-Z.
Shyue J.-J.
Justin Thomas, K. R.
Kapoor N.
Chen C.-T.
Lin Y.-P.
Wang P.-H.
Hung H.-W.
Li J.-Y.
Chen S.-P.
Published in: Journal of Materials Chemistry
Abstract: We reveal in this communication a new finding regarding the use of a sky-blue emitter to generate purplish-blue emission from organic light emitting diodes (OLEDs) with a polarity matching and high-energy exciton generating host. The resulting device exhibits CIE xy coordinates of (0.155, 0.063) and a 3.5% external quantum efficiency, with a 1.2 lm W -1 power efficiency at 100 cd m -2 as a sky-blue emitter, 1-((9,9-diethyl-9H- fluoren-2-yl)ethynyl)pyrene with CIE xy of (0.190, 0.241) is doped into a host of 4,4′-bis(9-carbazolyl)-biphenyl, for example. The resulting purplish-blue emission enables a greater than 100% color saturation. The extraordinarily marked blue-shift may result from a low doping concentration to prevent bathochromic shift due to emitter segregation, a polarity matching host to further disperse the emitter, and an efficient host and guest energy level pairing that enables excitons to be generated on the host to trigger short wavelength emission. Furthermore, the host is capable of generating excitons with higher energy to facilitate the triggering of emission with a shorter wavelength. The high efficiency may be attributed to the low doping concentration preventing efficiency roll-off caused by concentration-quenching, the excitons generated on the host facilitating the occurrence of the effective host-to-guest energy transfer, and the employed host possessing an effective host-to-guest energy transfer effect. Notably, the new approach also works for other light-blue emitters in yielding a highly desirable deep-blue light, provided their molecular structure is free of steric hindrance. © 2012 The Royal Society of Chemistry.
Citation: Journal of Materials Chemistry (2012), 22(31): 15500-15506
URI: https://doi.org/10.1039/c2jm32216a
http://repository.iitr.ac.in/handle/123456789/3343
Issue Date: 2012
ISSN: 9599428
Author Scopus IDs: 35083609400
56484852800
55315412300
54787140100
6603332427
57203389297
36705999100
7501966025
27170760100
35201981200
55315591300
35085196100
7410259366
Author Affiliations: Jou, J.-H., Department of Materials Science and Engineering, National Tsing Hua University, Hsin-Chu 300, Taiwan
Chen, Y.-L., Department of Materials Science and Engineering, National Tsing Hua University, Hsin-Chu 300, Taiwan
Tseng, J.-R., Department of Materials Science and Engineering, National Tsing Hua University, Hsin-Chu 300, Taiwan
Wu, R.-Z., Department of Materials Science and Engineering, National Tsing Hua University, Hsin-Chu 300, Taiwan
Shyue, J.-J., Research Center for Applied Sciences, Academia Sinica, Taipei 11529, Taiwan
Justin Thomas, K.R., Organic Materials Laboratory, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee-247 667, India
Kapoor, N., Organic Materials Laboratory, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee-247 667, India
Chen, C.-T., Department of Chemistry, National Tsing Hua University, Hsin-Chu 300, Taiwan
Lin, Y.-P., Green Energy and Environment Research Laboratories, Industrial Technology Research Institute, Chutung, Hsinchu 31040, Taiwan
Wang, P.-H., Green Energy and Environment Research Laboratories, Industrial Technology Research Institute, Chutung, Hsinchu 31040, Taiwan
Hung, H.-W., Green Energy and Environment Research Laboratories, Industrial Technology Research Institute, Chutung, Hsinchu 31040, Taiwan
Li, J.-Y., Green Energy and Environment Research Laboratories, Industrial Technology Research Institute, Chutung, Hsinchu 31040, Taiwan
Chen, S.-P., Green Energy and Environment Research Laboratories, Industrial Technology Research Institute, Chutung, Hsinchu 31040, Taiwan
Corresponding Author: Jou, J.-H.; Department of Materials Science and Engineering, National Tsing Hua University, Hsin-Chu 300, Taiwan
Appears in Collections:Journal Publications [CY]

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