[1] [1] Uddin A, Lee C B, Wong J. J. Lumin., 2011, 131: 1037.

[2] [2] Lee C B, Uddin A, Andersson T G. Solid State Commun., 2007, 142: 206.

[3] [3] Uddin A, Lee C B. Physica Status Solidi (C), 2011, 8: 80.

[4] [4] Gómez J A, Nüesch F, Zuppiroli L, et al. Synth. Met., 2010, 160: 317.

[5] [5] Wen S W, Lee M T, Chen C H. J. Display Technol., 2005, 1: 90.

[6] [6] Lee Y G, Lee H N, Kang S K, et al. Appl. Phys. Lett., 2006, 89: 183515.

[7] [7] Fong H H, Lun K C, So S K. Chem. Phys. Lett., 2002, 353: 407.

[8] [8] Tse S C, So S K, Yeung M Y, et al. Chem. Phys. Lett., 2006, 422: 354.

[9] [9] Ho M H, Wu Y S, Wen S W, et al. Appl. Phys. Lett., 2006, 89: 252903.

[10] [10] Ishihara S, Hase H, Okachi T, et al. Thin Solid Films, 2014, 554: 213.

[11] [11] Wu I W, Wang P S, Useng W H, et al., Org. Electron., 2012, 13: 13.

[12] [12] Zhang X W, Xu J W, Xu H R, et al. J. Phys. D: Appl. Phys., 2013, 46: 055102.

[13] [13] Ho M H, Hsieh M T, Lin K H, et al. Appl. Phys. Lett., 2009, 94: 023306.

[14] [14] Li T, Li X, Li W, et al. Thin Solid Films, 2009, 517: 4629.

[15] [15] Kim S H, Choi K H, Lee H M, et al., J. Appl. Phys., 2000, 87: 882.

[16] [16] Chen C C, Huang B C, Lin M S, et al. Org. Electron., 2010, 11: 1901.