1887
banner image
No data available.
Please log in to see this content.
You have no subscription access to this content.
No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
oa
Graded-host phosphorescent light-emitting diodes with high efficiency and reduced roll-off
Rent:
Rent this article for
Access full text Article
/content/aip/journal/adva/2/1/10.1063/1.3701685
1.
1. S. R. Forrest, Nature 428(6986), 911 (2004).
http://dx.doi.org/10.1038/nature02498
2.
2. K. Leo, S. Reineke, F. Lindner, G. Schwartz, N. Seidler, K. Walzer, and B. Lussem, Nature 459(7244), 234 (2009).
http://dx.doi.org/10.1038/nature08003
3.
3. C. Adachi, M. A. Baldo, M. E. Thompson, and S. R. Forrest, J Appl Phys 90(10), 5048 (2001).
http://dx.doi.org/10.1063/1.1409582
4.
4. M. A. Baldo, C. Adachi, and S. R. Forrest, Phys Rev B 62(16), 10967 (2000).
http://dx.doi.org/10.1103/PhysRevB.62.10967
5.
5. J. Y. Lee, S. H. Kim, J. Jang, and K. S. Yook, Appl Phys Lett 92(2), 023513 (2008).
http://dx.doi.org/10.1063/1.2836270
6.
6. E. Polikarpov, J. S. Swensen, L. Cosimbescu, P. K. Koech, J. E. Rainbolt, and A. B. Padmaperuma, Appl Phys Lett 96(5), 053306 (2010).
http://dx.doi.org/10.1063/1.3298556
7.
7. A. B. Chwang, R. C. Kwong, and J. J. Brown, Appl Phys Lett 80(5), 725 (2002).
http://dx.doi.org/10.1063/1.1446992
8.
8. L. D. Wang, G. T. Lei, and Q. Yong, Jpn J Appl Phys 2 43(9A-B), L1226 (2004).
http://dx.doi.org/10.1143/JJAP.43.L1226
9.
9. N. Chopra, J. S. Swensen, E. Polikarpov, L. Cosimbescu, F. So, and A. B. Padmaperuma, Appl Phys Lett 97(3), 033304 (2010).
http://dx.doi.org/10.1063/1.3464969
10.
10. W. L. Li, Z. S. Su, and B. Chu, Thin Solid Films 519(16), 5634 (2011).
http://dx.doi.org/10.1016/j.tsf.2011.03.008
11.
11. M. T. Lee, M. T. Chu, C. H. Chen, and M. R. Tseng, Org Electron 10(6), 1158 (2009).
http://dx.doi.org/10.1016/j.orgel.2009.06.005
12.
12. H. Y. Chu, J. Lee, J. I. Lee, and J. Y. Lee, Appl Phys Lett 94(19), 193305 (2009).
http://dx.doi.org/10.1063/1.3136861
13.
13. H. Y. Chu, J. Lee, J. I. Lee, and J. Y. Lee, Org Electron 10(8), 1529 (2009).
http://dx.doi.org/10.1016/j.orgel.2009.06.005
14.
14. N. C. Erickson and R. J. Holmes, Appl Phys Lett 97(8), 083308 (2010).
http://dx.doi.org/10.1063/1.3481426
15.
15. H. Xu, C. M. Han, G. H. Xie, Z. S. Zhang, L. H. Xie, Y. Zhao, S. Y. Liu, and W. Huang, Adv Mater 23(21), 2491 (2011).
http://dx.doi.org/10.1002/adma.201100322
16.
16. J. Y. Lee, S. H. Kim, and J. Jang, Appl Phys Lett 91(8), 083511 (2007).
http://dx.doi.org/10.1063/1.2773941
17.
17. L. X. Xiao, Z. J. Chen, B. Qu, J. X. Luo, S. Kong, Q. H. Gong, and J. J. Kido, Adv Mater 23(8), 926 (2011).
http://dx.doi.org/10.1002/adma.201003128
18.
18. S. J. Su, Y. Takahashi, T. Chiba, T. Takeda, and J. Kido, Adv Funct Mater 19(8), 1260 (2009).
http://dx.doi.org/10.1002/adfm.200800809
19.
19. S. Reineke, K. Walzer, and K. Leo, Phys Rev B 75(12) (2007).
http://dx.doi.org/10.1103/PhysRevB.75.125328
20.
20. J. Y. Lee and K. S. Yook, Appl Phys Lett 92(19) (2008).
21.
21. Y. Divayana and X. W. Sun, Org Electron 10(2), 320 (2009).
http://dx.doi.org/10.1016/j.orgel.2008.12.004
22.
22. J. H. Seo, H. M. Kim, E. Y. Choi, D. H. Choi, J. H. Park, H. S. Yoo, H. J. Kang, K. H. Lee, S. S. Yoon, and Y. K. Kim, Jpn J Appl Phys 49(8), 08JG04 (2010).
http://dx.doi.org/10.1143/JJAP.49.08JG04
http://aip.metastore.ingenta.com/content/aip/journal/adva/2/1/10.1063/1.3701685
Loading
View: Figures

Figures

Image of FIG. 1.

Click to view

FIG. 1.

(a) Device structure with layer compositions, (b) illustration of graded hosts with uniformly varying host concentration, and (c) proposed energy diagram with HOMO-LUMO values available in the literature.

Image of FIG. 2.

Click to view

FIG. 2.

(a) Electroluminescence spectra for the devices with TCTA hole transport material host, TPBI electron transport material host and graded mixed hosts of TCTA and TPBI (G-host) and (b) current density-voltage-luminance (LIV) characteristics of the three devices.

Image of FIG. 3.

Click to view

FIG. 3.

(a) Luminance efficiency vs. current density and (b) power efficiency vs. luminance of the devices with TCTA hole transport material host, TPBI electron transport material host and the graded mixed hosts of TCTA and TPBI (G-host). Inset of (a) Normalized luminance efficiency vs. current density, inset of (b) Normalized power efficiency vs. luminance.

Image of FIG. 4.

Click to view

FIG. 4.

Comparison of power efficiency and external quantum efficiency (EQE) vs. current density between the D-host and G-host devices.

Loading

Article metrics loading...

/content/aip/journal/adva/2/1/10.1063/1.3701685
2012-03-29
2014-04-19

Abstract

We demonstrated graded-host phosphorescent organic light-emitting diodes with high efficiency and reduced efficiency roll-off. The emissive layer of the graded host device consists of both electron and hole transport type hosts, 1,3,5-tris(N-phenylbenzimidazole-2-yl)benzene (TPBI) and 4,4,4′′-tris(N-carbazolyl)triphenylamine, respectively, with graded composition, and the phosphorescent red emitter bis(2-phenylquinoline) (acetylacetonate) iridium(III), which was uniformly doped into the graded host matrix. The graded host device shows improved quantum efficiency and power efficiency with significantly reduced efficiency roll-off as compared to the unipolar-host and double layer heterojunction host devices.

Loading

Full text loading...

/deliver/fulltext/aip/journal/adva/2/1/1.3701685.html;jsessionid=25vcctlcbvafo.x-aip-live-02?itemId=/content/aip/journal/adva/2/1/10.1063/1.3701685&mimeType=html&fmt=ahah&containerItemId=content/aip/journal/adva
true
true
This is a required field
Please enter a valid email address
752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Graded-host phosphorescent light-emitting diodes with high efficiency and reduced roll-off
http://aip.metastore.ingenta.com/content/aip/journal/adva/2/1/10.1063/1.3701685
10.1063/1.3701685
SEARCH_EXPAND_ITEM