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Lim DH, Lee SJ, Koo JR, et al. Improved efficiency of red phosphorescent organic light-emitting diodes with combination of heterojunction and mixed host structure. J Nanosci Nanotechnol. 2014;14(8):5998-6001doi: 10.1166/jnn.2014.8442.
Lim, D. H., Lee, S. J., Koo, J. R., Kim, B. Y., Shin, H. S., Lee, K. H., Lee, S. Y., Kim, W. Y., Yoon, S. S., & Kim, Y. K. (2014). Improved efficiency of red phosphorescent organic light-emitting diodes with combination of heterojunction and mixed host structure. Journal of nanoscience and nanotechnology, 14(8), 5998-6001. https://doi.org/10.1166/jnn.2014.8442
Lim, Dong Hwan, et al. "Improved efficiency of red phosphorescent organic light-emitting diodes with combination of heterojunction and mixed host structure." Journal of nanoscience and nanotechnology vol. 14,8 (2014): 5998-6001. doi: https://doi.org/10.1166/jnn.2014.8442
Lim DH, Lee SJ, Koo JR, Kim BY, Shin HS, Lee KH, Lee SY, Kim WY, Yoon SS, Kim YK. Improved efficiency of red phosphorescent organic light-emitting diodes with combination of heterojunction and mixed host structure. J Nanosci Nanotechnol. 2014 Aug;14(8):5998-6001. doi: 10.1166/jnn.2014.8442. PMID: 25936044.
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J Nanosci Nanotechnol. 2014 Aug;14(8):5998-6001. doi: 10.1166/jnn.2014.8442.

Improved efficiency of red phosphorescent organic light-emitting diodes with combination of heterojunction and mixed host structure.

Journal of nanoscience and nanotechnology

Dong Hwan Lim, Seok Jae Lee, Ja Ryong Koo, Bo Young Kim, Hyun Su Shin, Kum Hee Lee, Sang Youn Lee, Woo Young Kim, Seung Soo Yoon, Young Kwan Kim

PMID: 25936044 DOI: 10.1166/jnn.2014.8442

Abstract

We report an improvement of efficiency in red phosphorescent organic light-emitting diodes (PHOLEDs) based on a combination of heterojunction (HJ) structure and mixed host (MH) system using a phosphorescent red emitter: bis(2-phenylquinolinato)-acetylacetonate iridium III [Ir(pq)2(acac)] doped in 4,4,N,N'-dicarbazolebiphenyl (CBP) of hole transport type host material and 1,3,5-tris(N-phenylbenzimidazole-2-yl)benzene (TPBi) of electron transport type host material. This combination device resulted in an effective electron and hole balance and distribution of the recombination zone. Therefore, highly efficient red PHOLEDs with maximum luminous efficiency and external quantum efficiency of 21.93 cd/A and 14.09% were achieved. Moreover, the combination device showed a power efficiency of 9.51 lm/W, which is higher than 7.61 lm/W in the control device at a luminance of 1000 cd/m2.

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