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Alq3 photoluminescences (PL) enhanced by self-assembled silver films are investigated experimentally and theoretically. The experimental results show that both the apparent enhancement factor (AEF) and the emission enhancement factor (EEF) of Alq3 PL increase with the increase of density of average 70 nm diameter silver nanoparticles on the substrate. The maxima of AEF and EEF are about 3.2 and 13, respectively. Based on the optical antenna theory, the theoretical maxima of both quantum efficiency enhancement factor and EEF of Alq3 PL are about 1.4 and 15, respectively. By comparing of the experimental results with the theoretical results, we can conclude that the near-field enhancement of silver nanoparticles makes a major contribution to Alq3 PL emission enhancement, and the emission enhancement is dependent on the Alq3-silver nanoparticle distance and the area coverage ratio of silver nanoparticles to substrate.
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Keywords:
- photoluminescence /
- near-field enhancement /
- quantum efficiency /
- optical antenna
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[18] Yang K Y, Choi K C, Ahn C W 2009 Opt. Express 17 11495
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[22] Tagaya M, Ogawa M 2008 Phys. Chem. Chem. Phys. 10 6849
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[25] [26] [27] Emmanuel F, Samuel G 2008 J. Phys. D: Appl. Phys. 41 013001
[28] Tanabe K 2008 J. Phys. Chem. C 112 15721
[29] [30] Wilson L R, Richards B S 2009 Appl. Opt. 48 212
[31] [32] Johnson P B, Christy R W 1972 Phys. Rev. B 6 4370
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[1] Reilly T H, van de Lagemaat I J, Tenent R C, Morfa A J, Rowlen K L 2008 Appl. Phys. Lett. 92 243304
[2] Aslan K, Malyn S N, Zhang Y, Geddes C D 2008 J. Appl. Phys. 103 084307
[3] [4] Hutter E, Fendler J H 2004 Adv. Mater. 16 1685
[5] [6] [7] Tong J B, Huang Q, Zhang X D, Zhang C S, Zhao Y 2012 Acta Phys. Sin. 61 047801 (in Chinese) [佟建波, 黄茜, 张晓丹, 张存善, 赵颖 2012 61 047801]
[8] Ren Y D, Hao S J, Qiu Z Y 2013 Acta Phys. Sin. 62 147302 (in Chinese) [任艳东, 郝淑娟, 邱忠阳 2013 62 147302]
[9] [10] Qiu D J, Fan W Z, Weng S, Wu H Z, Wang J 2011 Acta Phys. Sin. 60 087301 (in Chinese) [邱东江, 范文志, 翁圣, 吴惠桢, 王俊 2011 60 087301]
[11] [12] [13] Park H J, Vak D, Noh Y Y, Lim B, Kim D Y 2007 Appl. Phys. Lett. 90 161107
[14] Cho K H, Ahn S I, Lee S M, Choi C S, Choi K C 2010 Appl. Phys. Lett. 97 193306
[15] [16] [17] Yang K Y, Choi K C, Ahn C W 2009 Appl. Phys. Lett. 94 173301
[18] Yang K Y, Choi K C, Ahn C W 2009 Opt. Express 17 11495
[19] [20] [21] Fujiki A, Uemura T, Zettsu N, Akai-Kasaya M, Saito A, Kuwahara Y 2010 Appl. Phys. Lett. 96 043307
[22] Tagaya M, Ogawa M 2008 Phys. Chem. Chem. Phys. 10 6849
[23] [24] Dong Y F, Li Q S 2002 Acta Phys. Sin. 51 1645 (in Chinese) [董艳锋, 李清山 2002 51 1645]
[25] [26] [27] Emmanuel F, Samuel G 2008 J. Phys. D: Appl. Phys. 41 013001
[28] Tanabe K 2008 J. Phys. Chem. C 112 15721
[29] [30] Wilson L R, Richards B S 2009 Appl. Opt. 48 212
[31] [32] Johnson P B, Christy R W 1972 Phys. Rev. B 6 4370
[33] [34] [35] Bharadwaj P, Beams R, Novotny L 2011 Chem. Sci. 2 136
[36] [37] Mattoussi H, Murata H, Merritt C D, Iizumi Y, Kido J, Kafafi Z H 1999 J. Appl. Phys. 86 2642
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