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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