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To gain an insight into the effect of electric field on the electro-luminescence of organic light emission diode, the ultrafast pump-probe spectroscopy is used to investigate the transient phenomena of the excitons induced by the electric field. Under the excitation density of 230 μJ/cm2, the decay of the singlet excitons shows a fast and a slow component. The amplitude factor and the relaxation time of fast component are field-dependent. Compared with the zero biascase, the relaxation time of the fast component becomes faster at a bias of 6.4×105 V/cm, its amplitude factor is increased from 22% to 72%, about 50% initial excitons are dissociated by the electric field. The slow component is field-independent, its relaxation time-constant is about 890 ps. The longitudinal acoustic phonons with sound velocity of 17 /ps generated by excitation pulse are observed.
[1] ［1］Mezyk J, Meinardi F, Cocchi M 2008 Appl. Phys. Lett. 93 093301
[2] ［2］Kalinowski J 2005 Organic Light Emitting Diodes: Principles, Characteristics, and Processes (New York: Marcel Dekker) p135
[3] ［3］Stampor W, Mezyk J 2007 Chem. Phys. 337 151
[4] ［4］Kalinowski J, Mezyk J, Meinardi F, Tubino R, Cocchi M, Virgili D 2005 J. Appl. Phys. 98 063532-1
[5] ［5］Holzer W, Penzkofer A, Tsuboi T 2005 Chem. Phys. 308 93
[6] ［6］Jiang H, Xu X H, Sun X, Fu R L, Chu J H 1999 Acta Phys. Sin. 48 2327 (in Chinese) ［姜浩、徐晓华、孙鑫、傅柔励、褚君浩 1999 48 2327］
[7] ［7］Arkhipov V I, Bssler H, Deussen M, Gbel E O, Kersting R, Kurz H, Lemmer U, Mahrt R F 1995 Phys. Rev. B 52 4932
[8] ［8］Yang H, Zhang T Q, Wang S F, Gong Q H 2000 Acta Phys. Sin. 49 1292 (in Chinese) ［杨宏、张铁桥、王树峰、龚旗煌 2000 49 1292］
[9] ［9］Gadermaier C, Grasse F, Perissinotto S, Graf M, Galbrecht F, Scherf U, List E J W, Lanzani G 2008 Phys. Rev. Lett. 100 057401
[10] ］Bssler H 1997 Primary Photoexcitations in Conjugated Polymers: Molecular Exciton Versus Semiconductor Band Model (Singapore: World Scientific) p51
[11] ］Maniloff E S, Klimov V I, McBranch D W 1997 Phys. Rev. B 56 1876
[12] ］Zaushitsyn Y, Gulbinas V, Zigmantas D, Zhang F L, Ingans O, Sundstrm V, Zartsev A 2004 Phys. Rev. B 70 075202
[13] ］Shkunov M N, Huang J D, Vardeny Z V, Yoshino K 1999 Synth. Metals 102 1118
[14] ］Li A Z, Chen Z F, Wang H, Zhang Y W, Zhang W, Yu H C, Huang J W, Ji L N 2009 Acta Phys. Sin. 58 1321 (in Chinese) ［黎爱珍、陈志峰、王惠、张燕伟、张伟、余汉诚、黄锦汪、计亮年 2009 58 1321］
[15] ］Yin S H, Liu J Y, Lou N Q 2006 J. At. Mol. Phys. 23 49 (in Chinese) ［尹淑慧、刘建勇、楼南泉 2006 原子与分子 23 49］
[16] ］Samuel I D W, Crystal B, Rumbles G, Burn P L, Holmes A B, Friend R F 1993 Chem. Phys. Lett. 213 472
[17] ］Yan M, Rothberg L J, Papadimitrankopoulos F, Galvin M E, Miller T M 1993 Phys. Rev. Lett. 73 2827
[18] ］Heeger A J 1997 Primary Photoexcitations in Conjugated Polymers: Molecular Exciton Versus Semiconductor Band Model (Singapore: World Scientific) p20
[19] ］McBranch D W, Sinclair M B 1997 Primary Photoexcitations in Conjugated Polymers: Molecular Exciton Versus Semiconductor Band Model (Singapore: World Scientific) p587
[20] ］Kepler R G, Valencia V S, Jacobs S J, McNamara J J 1996 Synth. Metals 78 227
[21] ］Zhao E H, Fu R T, Sun X, Fu R L, Zhu J H 1998 Acta Phys. Sin. 47 2031 (in Chinese) ［赵二海、傅荣堂、孙鑫、傅柔励、褚君浩 1998 47 2031］
[22] ］Thomsen C, Strait J, Vardeny Z, Maris H J, Tauc J 1984 Phys. Rev. Lett. 53 989
[23] ］Kanner G S, Vardeny Z V, Hess B C 1990 Phys. Rev. B 42 5403
[24] ］Devos A, Robillard J F, Cte R 2006 Phys. Rev. B 74 064114
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[1] ［1］Mezyk J, Meinardi F, Cocchi M 2008 Appl. Phys. Lett. 93 093301
[2] ［2］Kalinowski J 2005 Organic Light Emitting Diodes: Principles, Characteristics, and Processes (New York: Marcel Dekker) p135
[3] ［3］Stampor W, Mezyk J 2007 Chem. Phys. 337 151
[4] ［4］Kalinowski J, Mezyk J, Meinardi F, Tubino R, Cocchi M, Virgili D 2005 J. Appl. Phys. 98 063532-1
[5] ［5］Holzer W, Penzkofer A, Tsuboi T 2005 Chem. Phys. 308 93
[6] ［6］Jiang H, Xu X H, Sun X, Fu R L, Chu J H 1999 Acta Phys. Sin. 48 2327 (in Chinese) ［姜浩、徐晓华、孙鑫、傅柔励、褚君浩 1999 48 2327］
[7] ［7］Arkhipov V I, Bssler H, Deussen M, Gbel E O, Kersting R, Kurz H, Lemmer U, Mahrt R F 1995 Phys. Rev. B 52 4932
[8] ［8］Yang H, Zhang T Q, Wang S F, Gong Q H 2000 Acta Phys. Sin. 49 1292 (in Chinese) ［杨宏、张铁桥、王树峰、龚旗煌 2000 49 1292］
[9] ［9］Gadermaier C, Grasse F, Perissinotto S, Graf M, Galbrecht F, Scherf U, List E J W, Lanzani G 2008 Phys. Rev. Lett. 100 057401
[10] ］Bssler H 1997 Primary Photoexcitations in Conjugated Polymers: Molecular Exciton Versus Semiconductor Band Model (Singapore: World Scientific) p51
[11] ］Maniloff E S, Klimov V I, McBranch D W 1997 Phys. Rev. B 56 1876
[12] ］Zaushitsyn Y, Gulbinas V, Zigmantas D, Zhang F L, Ingans O, Sundstrm V, Zartsev A 2004 Phys. Rev. B 70 075202
[13] ］Shkunov M N, Huang J D, Vardeny Z V, Yoshino K 1999 Synth. Metals 102 1118
[14] ］Li A Z, Chen Z F, Wang H, Zhang Y W, Zhang W, Yu H C, Huang J W, Ji L N 2009 Acta Phys. Sin. 58 1321 (in Chinese) ［黎爱珍、陈志峰、王惠、张燕伟、张伟、余汉诚、黄锦汪、计亮年 2009 58 1321］
[15] ］Yin S H, Liu J Y, Lou N Q 2006 J. At. Mol. Phys. 23 49 (in Chinese) ［尹淑慧、刘建勇、楼南泉 2006 原子与分子 23 49］
[16] ］Samuel I D W, Crystal B, Rumbles G, Burn P L, Holmes A B, Friend R F 1993 Chem. Phys. Lett. 213 472
[17] ］Yan M, Rothberg L J, Papadimitrankopoulos F, Galvin M E, Miller T M 1993 Phys. Rev. Lett. 73 2827
[18] ］Heeger A J 1997 Primary Photoexcitations in Conjugated Polymers: Molecular Exciton Versus Semiconductor Band Model (Singapore: World Scientific) p20
[19] ］McBranch D W, Sinclair M B 1997 Primary Photoexcitations in Conjugated Polymers: Molecular Exciton Versus Semiconductor Band Model (Singapore: World Scientific) p587
[20] ］Kepler R G, Valencia V S, Jacobs S J, McNamara J J 1996 Synth. Metals 78 227
[21] ］Zhao E H, Fu R T, Sun X, Fu R L, Zhu J H 1998 Acta Phys. Sin. 47 2031 (in Chinese) ［赵二海、傅荣堂、孙鑫、傅柔励、褚君浩 1998 47 2031］
[22] ］Thomsen C, Strait J, Vardeny Z, Maris H J, Tauc J 1984 Phys. Rev. Lett. 53 989
[23] ］Kanner G S, Vardeny Z V, Hess B C 1990 Phys. Rev. B 42 5403
[24] ］Devos A, Robillard J F, Cte R 2006 Phys. Rev. B 74 064114
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