Journal of Surface Science and Engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Emission Characteristics of Blue Fluorescence Tandem OLED Using MoOx

MoOx를 사용한 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 : 2014.06.16
  • Accepted : 2014.06.24
  • Published : 2014.06.30
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Abstract

To improve emission efficiency of organic light emitting devices (OLEDs), we fabricated the tandem OLED of ITO / 2-TNATA / NPB / SH-1: 3 vol.% BD-2 / Bphen / Liq / Al / $MoO_x$ (X nm) / 2-TNATA / NPB / SH-1: 3 vol.% BD-2 / Bphen / Liq / Al structure. And emission properties of single OLED and tandem OLED with $MoO_x$ thickness as charge generation layer (CGL) were measured. The current emission efficiency and quantum efficiency of tandem OLED with $MoO_x$ of 3 nm thickness were improved compare with single OLED from 7.46 cd/A and 5.39% to 22.57 cd/A and 11.76%, respectively. In case of thicker or thinner than $MoO_x$ of 3~5 nm, the current emission efficiency and quantum efficiency were decreased, because balance of electron and hole in emission layer was not matching. The driving voltage was increased from 8 V of single OLED to 15 V of tandem OLED by thickness increase of OLED. As a result, it was possible to improve the emission efficiency of OLEDs by optimized $MoO_x$ thickness.

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References

  1. S. W. Liu, Y. Divayana, X. W. Sun, Y. Wang, K. S. Leck, H. V. Demir, Optics Express 19 (2011) 4513. https://doi.org/10.1364/OE.19.004513
  2. N. C. Erickson, R. J. Holmes, Appl. Phys. Lett. 97 (2010) 083308. https://doi.org/10.1063/1.3481426
  3. J. Clark and G. Lanzani, Nat. Photonics 4 (2010) 438 https://doi.org/10.1038/nphoton.2010.160
  4. Q. Wang, J. Ding, Z. Zhang, D. Ma, Y. Cheng, L. Wang, F. Wang, J. Appl. Phys 105 (2009) 076101. https://doi.org/10.1063/1.3106051
  5. H. D. Chun, H. S. Na, J. W. Yang, S. H. Ju, I. Kor. Inst. Surf. Eng., 46 (2013) 93. https://doi.org/10.5695/JKISE.2013.46.2.093
  6. L. S. Liao, W. K. Slusarek, T. K. Hatwar, M. L. Ricks, D. L. Comfort, Adv. Mater., 20 (2008) 324. https://doi.org/10.1002/adma.200700454
  7. H. Kanno, N. C. Giebink, Y. Sun, S. R. Forrest, Appl. Phys. Lett., 89 (2006) 023503. https://doi.org/10.1063/1.2219725
  8. T. Chiba, Y. J. Pu, R. Miyazaki, K. Nakayama, H. Sasabe, J. Kido, Org. Electronics. 12 (2011) 710. https://doi.org/10.1016/j.orgel.2011.01.022
  9. X. Qi, N. Li, S. R. Forrest, J. Appl. Phys., 107 (2010) 014514. https://doi.org/10.1063/1.3275050
  10. L. Duan, T. Tsuboi, Y. Qiu, Y. Li, G. Zhang, Optics Express 20 (2012) 14564. https://doi.org/10.1364/OE.20.014564
  11. P. S. Vincentt, W. A. Barlow, R. A. Hann, G. G. Roberts, Thin Solid Film, 94 (1982) 171. https://doi.org/10.1016/0040-6090(82)90509-0
  12. R. H. Partridge, Polymer, 24 (1983) 748. https://doi.org/10.1016/0032-3861(83)90014-9
  13. C. W. Tang, S. A. VanSlyke, Appl. Phys. Lett., 51 (1987) 913. https://doi.org/10.1063/1.98799
  14. 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
  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
  16. 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
  17. 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

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