Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Emission Characteristics of Blue Fluorescence Tandem OLED with Materials of CGL

CGL의 재료에 따른 청색 형광 Tandem OLED의 발광 특성

  • Kwak, Tea-Ho (Department of Advanced Materials Science & Engineering, Daejin University) ;
  • Ju, Sung-Hoo (Department of Advanced Materials Science & Engineering, Daejin University)
  • 곽태호 (대진대학교 신소재공학과) ;
  • 주성후 (대진대학교 신소재공학과)
  • Received : 2014.08.01
  • Accepted : 2014.08.19
  • Published : 2014.08.30
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Abstract

We investigated emission characteristics of tandem organic light emitting devices (OLEDs) with p-type materials as charge generation layer. The tandem OLEDs were fabricated by using $MoO_x$, $WO_x$, C60 and HATCN as p-type material or not using p-type material for charge generation. When HATCN was used as p-type material, it showed high current density at low applied voltage, but increase of efficiency was small because of charge unbalance in emitting layer. In case of tandem OLED not using p-type material, applied voltage increased remarkably because of difficulty of hole injection. In case of $MoO_x$, $WO_x$ or C60 as p-type material, current emission efficiency increased greatly. In particular, current emission efficiency of tandem OLED using $MoO_x$ as p-type material increased up to 3 times than current emission efficiency of single OLED. The Commission Internationale de l'Eclairage (CIE) 1931 color coordinates were changed by overlapping of 504 nm emission wavelength. As a result, emission efficiency of tandem OLED improved compared with single OLED, but driving voltage also increased by increase of organic layer thickness.

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References

  1. C.W. Tang, S.A. Vanslyke, Appl. Phys. Lett., 51 (1987) 913. https://doi.org/10.1063/1.98799
  2. J. Clark, G. Lanzani, Nature, 4 (2010) 438.
  3. T. Tsutsui, M. Terai, Appl. Phys. Lett., 84 (2004) 440. https://doi.org/10.1063/1.1640470
  4. T. Tsutsui, M. Terai, Appl. Phys. Lett., 90 (2007) 083502. https://doi.org/10.1063/1.2709519
  5. Fawen Guo, Dongge Ma, Appl. Phys. Lett., 87 (2005) 173510. https://doi.org/10.1063/1.2120898
  6. Ping Chen, Wenfa Xie, Jiang Li, Tao Guan, Yu Duan, Yi Zhao, Shiyong Liu, Chunsheng Ma, Liying Zhang, Bin Li, Appl. Phys. Lett., 91 (2007) 023505. https://doi.org/10.1063/1.2757096
  7. Hongmei Zhang, Yanfeng Dai, Dongge Ma, Hongmei Zhang, Appl. Phys. Lett., 91 (2007) 123504. https://doi.org/10.1063/1.2787877
  8. Chieh-Wei Chen, Yin-Jui Lu, Chung-Chih Wu, Elbert Hsing-En Wu, Chih-WeiChu, YangYang, Appl. Phys. Lett., 87 (2005) 241121. https://doi.org/10.1063/1.2141718
  9. H. Kanno, R.J. Holmes, Y. Sun, S.K. Cohen, S.R. Forrest, Adv. Mater., 18 (2006) 339. https://doi.org/10.1002/adma.200501915
  10. Mei-Yee Chan, Shiu-Lun Lai, Kit-Ming Lau, Man-Keung Fung, Chun-Sing Lee, Shuit-Tong Lee, Adv. Funct. Mater., 17 (2007) 2509. https://doi.org/10.1002/adfm.200600642
  11. T. Chib, Y. Pu, R. Miyazaki, K. Nakayam, H. Sasabe, J. Kido, Organic Electronics, 12 (2011) 710 https://doi.org/10.1016/j.orgel.2011.01.022
  12. J. H. Burroughes, D. D. Bradley, A. R. Brown, R. N. Marks, K. Mackay, R. H. Friend, P. L.Burns, and A.B. Holmes, Nature, 347 (1990) 539 https://doi.org/10.1038/347539a0
  13. T. H. Kwak, S. H. Ju, J. Kor. Inst. Surf. Eng., 47 (2014) 104 https://doi.org/10.5695/JKISE.2014.47.3.104
  14. M. Liu, P. Chen, Q. Xue, F. Jianga, G. Xie, J. Hou, Y. Zhao, L. Zhang, B. Li, Microelectronics Journal, 39 (2008) 1622 https://doi.org/10.1016/j.mejo.2008.02.018
  15. C. H. Chang, Z. J. Wu, Y. H. Liang, Y. S. Chang, C. H. Chiu, C. W. Tai, H. H. Chang, Thin Solid Films, 548 (2013) 389 https://doi.org/10.1016/j.tsf.2013.08.084

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