INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
Prev
Next
|
|
|
Efficient top-emitting white organic light emitting device with an extremely stable chromaticity and viewing-angle |
Shao Ming (邵茗), Guo Xu (郭旭), Chen Shu-Fen (陈淑芬), Fan Qu-Li (范曲立), Huang Wei (黄维) |
Key Laboratory Cultivation Base for Organic Electronics and Information Displays and Institute of Advanced Materials, Nanjing University of Posts and Telecommunications, Nanjing 210046, China |
|
|
Abstract In this paper, we report on the fabrication of a top-emitting electrophosphorescent p-i-n white organic light-emitting diode on the basis of a low-reflectivity Sm/Ag semi-transparent cathode together with a thickness-optimized ZnS out-coupling layer. With a 24-nm out-coupling layer, the reflectivity of the cathode is reduced to 8% at 492 nm and the mean reflectivity is 24% in the visible area. By introducing an efficient electron blocking layer tris(1-phenylpyrazolato,N,C2')iridium(III) (Ir(ppz)3) to confine the exciton recombination area, the current efficiency and the colour stability of the device are effectively improved. A white emission with the Ir(ppz)3 layer exhibits a maximum current efficiency of 9.8 cd/A at 8 V, and the Commission Internationale de L'Eclairage (CIE) chromaticity coordinates are almost constant during a large voltage change of 6 V-11 V. There is almost no viewing angular dependence in the spectrum when the viewing angle is no more than 45°, with a CIEx,y coordinate variation of only (±0.0025, ±0.0008). Even at a large viewing angle (75°), the CIEx,y coordinate change is as small as (±0.0087, ±0.0013).
|
Received: 13 February 2012
Revised: 16 April 2012
Accepted manuscript online:
|
PACS:
|
85.60.Jb
|
(Light-emitting devices)
|
|
78.60.Fi
|
(Electroluminescence)
|
|
81.05.Fb
|
(Organic semiconductors)
|
|
Fund: Project supported by the Science Fund of the Ministry of Science and Technology, China (Grant No. 2009CB930600), the National Natural Science Foundation of China (Grants Nos. 60907047, 61274065, and 60977024), the Key Project of the Chinese Ministry of Education (Grants Nos. 104246 and 707032), the Research Fund for the Doctoral Program of Higher Education Institutions, China (Grant Nos. 20093223120003 and 20093223110003), the Natural Science Foundation of Jiangsu Province and the Higher Education Institutions of Jiangsu Province, China (Grants Nos. BK2009423, SJ209003, 10KJB510013, and 11KJD510003), the Fok Ying-Tong Education Foundation, China (Grant No. 111051), the "Qing Lan" Program of Jiangsu Province and the "Pandeng" Project of Nanjing University of Posts and Telecommunications, China (Grant Nos. NY210015, NY211069, and NY210040). |
Corresponding Authors:
Chen Shu-Fen, Huang Wei
E-mail: iamsfchen@njupt.edu.cn; wei-huang@njupt.edu.cn
|
Cite this article:
Shao Ming (邵茗), Guo Xu (郭旭), Chen Shu-Fen (陈淑芬), Fan Qu-Li (范曲立), Huang Wei (黄维) Efficient top-emitting white organic light emitting device with an extremely stable chromaticity and viewing-angle 2012 Chin. Phys. B 21 108507
|
[1] |
Jiao Z Q, Wu X M, Hua Y L, Dong M S, Su Y J, Shen L Y and Yin S G 2011 Chin. Phys. B 20 107803
|
[2] |
Yang Y, Chen S F, Xie J, Chen C Y, Shao M, Guo X and Huang W 2011 Acta Phys. Sin. 60 047809 (in Chinese)
|
[3] |
Cao G H, Qin D S, Guan M, Cao J S, Zeng Y P and Li J M 2008 Chin. Phys. B 17 1911
|
[4] |
Chen S F, Shao M, Guo X, Qian Y, Shi N E, Xie L H, Yang Y and Huang W 2012 Acta Phys. Sin. 61 087801 (in Chinese)
|
[5] |
Ko Y W, Chung C H, Lee J H, Kim Y H, Sohn C Y, Kim B C, Hwang C S, Song Y H, Lim J, Ahn Y J, Kang G W, Lee N and Lee C 2003 Thin Solid Films 426 246
|
[6] |
Attar H A A, Monkman A P, Tavasli M, Bettington S and Bryce M R 2005 Appl. Phys. Lett. 86 121101
|
[7] |
Zhang L J, Hua Y L, Wu X M, Wang Y and Yin S G 2008 Chin. Phys. B 17 3097
|
[8] |
Jiang X Y, Zhang Z L, Zhang B X, Zhu W Q and Xu S H 2002 Synth. Met. 129 9
|
[9] |
Chuen C H, Tao Y T, Wu F I and Shu C F 2004 Appl. Phys. Lett. 85 4609
|
[10] |
Shao Y and Yang Y 2005 Appl. Phys. Lett. 86 73510
|
[11] |
Wang Y Z, Sun R G, Meghdadi F, Leising G and Epstein A J 1999 Appl. Phys. Lett. 74 3613
|
[12] |
Wu Y S, Hwang S W, Chen H H, Lee M T, Shen W J and Chen C H 2005 Thin Solid Films 488 265
|
[13] |
Sun Y, Giebink N C, Kanno H, Ma B, Thompson M E and Forrest S R 2006 Nature 440 908
|
[14] |
Gong X, Wang S, Moses D, Bazan G C and Heeger A J 2005 Adv. Mater. 17 2053
|
[15] |
Chen S F, Deng L L, Xie J, Peng L, Xie L H, Fan Q L and Huang W 2010 Adv. Mater. 22 5227
|
[16] |
Jeon S O, Yook K S, Joo C W, Son H S and Lee J Y 2010 Thin Solid Films 518 3716
|
[17] |
Chen S F, Xie W F, Meng Y L, Chen P, Zhao Y and Liu S Y 2008 J. Appl. Phys. 103 054506
|
[18] |
Kanno H S, Sun Y R and Forrest S R 2005 Appl. Phys. Lett. 86 263502
|
[19] |
Chen S M and Kwok H S 2011 Org. Electron. 12 677
|
[20] |
Ma J, Piao X C, Liu J, Zhang L T, Zhang T Y, Liu M, Li T, Xie W F and Cui H N 2011 Org. Electron. 13 1187
|
[21] |
Ji W Y, Zhang L T, Zhang T Y, Xie W F and Zhang H Z 2010 Org. Electron. 11 202
|
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
|
|
|