CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
Prev
Next
|
|
|
Dependence of charge trapping of fluorescent and phosphorescent dopants in organic light-emitting diodes on the dye species and current density |
Wei Bin(魏斌)†, Liao Ying-Jie (廖英杰), Liu Ji-Zhong (刘纪忠), Lu Lin(路林), Cao Jin(曹进), Wang Jun (王军), and Zhang Jian-Hua (张建华) |
Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University, Shanghai 200072, China |
|
|
Abstract This paper utilizes multilayer organic light-emitting diodes with a thin layer of dye molecules to study the mechanism of charge trapping under different electric regimes. It demonstrates that the carrier trapping was independent of the current density in devices using fluorescent material as the emitting molecule while this process was exactly opposite when phosphorescent material was used. The triplet--triplet annihilation and dissociation of excitons into free charge carriers was considered to contribute to the decrease in phosphorescent emission under high electric fields. Moreover, the fluorescent dye molecule with a lower energy gap and ionized potential than the host emitter was observed to facilitate the carrier trapping mechanism, and it would produce photon emission.
|
Received: 14 June 2009
Revised: 15 July 2009
Accepted manuscript online:
|
PACS:
|
85.60.Jb
|
(Light-emitting devices)
|
|
73.50.Gr
|
(Charge carriers: generation, recombination, lifetime, trapping, mean free paths)
|
|
78.60.Fi
|
(Electroluminescence)
|
|
73.61.Ph
|
(Polymers; organic compounds)
|
|
71.35.-y
|
(Excitons and related phenomena)
|
|
71.20.Rv
|
(Polymers and organic compounds)
|
|
Fund: Project supported by the Key
Project of Shanghai Education Committee (Grant No.~08ZZ42), and
Science and Technology Commission of Shanghai Municipal (Grant
Nos.~08PJ14053, 08DZ1140702 and 08520511200). |
Cite this article:
Wei Bin(魏斌), Liao Ying-Jie (廖英杰), Liu Ji-Zhong (刘纪忠), Lu Lin(路林), Cao Jin(曹进), Wang Jun (王军), and Zhang Jian-Hua (张建华) Dependence of charge trapping of fluorescent and phosphorescent dopants in organic light-emitting diodes on the dye species and current density 2010 Chin. Phys. B 19 037105
|
[1] |
Tang C W, Vanslyke S A and Chen C H 1989 J. Appl. Phys. 65 3610
|
[2] |
Uchida M, Adachi C, Koyama T and Taniguchi Y 1999 J. Appl.Phys. 86 1680
|
[3] |
Sakamoto G, Adachi C, Koyama T, Taniguchi Y, Merritt C D, Murata Hand Kafai Z H 1999 Appl. Phys. Lett. 75 766
|
[4] |
Sano T, Fujii H, Nishio Y, Hamada Y, Takahashi H and Shibata K 1997Synth. Met. 91 27
|
[5] |
Nie H, Zhang B and Tang X Z 2007 Chin. Phys. 16 730
|
[6] |
Burrows P E, Bulovic V, Forrest S R, Sapochak L S, Mccarty D M andThompson M E 1994 Appl. Phys. Lett. 65 2922
|
[7] |
Adachi C, Tsutsui T and Saito S 1990 Appl. Phys. Lett. 57 531
|
[8] |
Zhang L J, Hua Y L, Wu X M, Wang Y and Yin S G 2008 Chin.Phys. B 17 3097
|
[9] |
Wakimoto T, Yonemoto Y, Funaki J, Tsuchida M, Murayama R, Nakada H,Matsumoto H, Yamamura S and Nomura M 1997 Synth. Met. 91 15
|
[10] |
Baldo M A, O'Brien D F, Thompson M E and Forrest S R 1999 Phys. Rev. B 60 14422
|
[11] |
Berggren M, Dodabalapur A, Slusher R E and Bao Z 1997 Nature 389 466
|
[12] |
Pschenitzka F and Sturm J C 2001 Appl. Phys. Lett. 79 4354
|
[13] |
Littman J and Martic P 1992 J. Appl. Phys. 72 3610
|
[14] |
Garbuzov D Z, Forrest S R, Tsekoun A G, Burrows P E,Bulovi? V and Thompson M E 1996 J. Appl. Phys. 80 4644
|
[15] |
Suzuki H and Hoshino A 1996 J. Appl. Phys. 79 8816
|
[16] |
Lamansky S, Kwong R C, Nugent M, Djurovich P I and Thompson M E2001 Org. Electron. 2 53
|
[17] |
Lamansky S, Djurovich P I, Abdel-Razzaq F, Garon S, Murphy D andThompson M E 2002 J. Appl. Phys. 92 1570
|
[18] |
Wu C H, Liu P Y, Hou L T and Li Y W 2008 Acta Phys. Sin. 57 7317 (in Chinese)
|
[19] |
Adachi C, Kwong R C, Djurovich P, Adamovich V, Baldo M C A, ThompsonM E and Forrest S R 2001 Appl. Phys. Lett. 79 2082
|
[20] |
Baldo M A, Thompson M E and Forrest S R 2000 Nature 403 750
|
[21] |
Kalinowski J, Stampor W, Szmytkowski J, Virgili D, Cocchi M, FattoriV and Sabatini C 2006 Phys. Rev. B 74 085316
|
No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
Altmetric
|
blogs
Facebook pages
Wikipedia page
Google+ users
|
Online attention
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
View more on Altmetrics
|
|
|