Blue organic light-emitting diodes with 2-methyl-9,10- bis(naphthalen-2-yl)anthracene as hole transport and emitting layer and the impedance spectroscopy analysis

다국어 초록 (Multilingual Abstract)

2-methyl-9,10-bis(naphthalen-2-yl)anthracene (MADN) based fluorescent blue organic light-emitting diodes (OLEDs) are demonstrated. With MADN as emitting layer, experiments indicate that thick MADN (40e60 nm) is preferable for constructing efficient blue OLED. With MADN as hole-transport and emitting layer and tris(8-hydroxy-quinolinato)aluminium (Alq3) as electron-transport layer, the OLED electroluminescent characteristics show a mixture emission of MADN and Alq3 with Commission Internationale d'Eclairage (CIE) color coordinates of (0.25, 0.34), indicating feasible hole transporting in MADN. Using 4,7-diphenyl-1,10-phenanthroline (BPhen) replacing Alq3 as electron-transport layer, the OLED shows deep blue emission with a maximum luminous efficiency of 4.8 cd/A and CIE color coordinates of (0.16, 0.09). The hole transport characteristics of MADN are further clarified by constructing hole-only device and performing impedance spectroscopy analysis. The results indicate that MADN shows superior hole-transport ability which is almost comparable to typical hole-transport material of N,N0-bis(naphthalen-1-yl)-N,N0-bis(phenyl)-benzidine (NPB), suggesting a promising application for constructing efficient blue OLED with integrated hole-transport layer and emitting layer.

참고문헌 (Reference)

1 Y. L. Chang, 104 : 173303-, 2014

2 S. Ishihara, 12 : 1364-, 2011

3 Y. G. Lee, 89 : 183515-, 2006

4 S. W. Wen, 1 : 90-, 2005

5 M. T. Lee, 85 : 3301-, 2004

6 X. Y. Jiang, 38 : 4153-, 2005

7 S. Tao, 397 : 1-, 2004

8 M. H. Ho, 94 : 023306-, 2009

9 C. H. Tsai, 87 : 243505-, 2005

10 M. T. Hsieh, 95 : 033501-, 2009

11 M. T. Hsieh, 96 : 133310-, 2010

12 H. H. Fong, 353 : 407-, 2002

13 S. C. Tse, 422 : 354-, 2006

14 M. H. Ho, 89 : 252903-, 2006

15 S. Ishihara, 554 : 213-, 2014

16 M. A. Khan, 103 : 014509-, 2008

17 I. W. Wu, 13 : 13-, 2012

18 X. W. Zhang, 46 : 055102-, 2013

19 A. Dodabalapur, 80 : 6954-, 1996

20 Y. Li, 14 : 1317-, 2002

21 S. Tokito, 86 : 2407-, 1999

22 M. T. Lee, 710-, 2004

23 S. Berleb, 89 : 286601-, 2002

24 C.H. Chen, "Organic Electroluminescent Materials & Devices" Wunan Press 2005