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基于扩展的一维SSH紧束缚模型结合非绝热的分子动力学方法，理论研究了共轭聚合物分子（PPV）在光脉冲作用下受激吸收和受激辐射的量子动力学过程. 首先，设定分子初始处于基态，讨论了受激吸收过程中不同的电子受激跃迁模式与光激发脉冲的关系. 通过对终态的分析，发现分子受激后只能产生电子-空穴的束缚态，包括：激子、双激子和高能激子. 计算了各种激发态的产率，特别是，给出了各种激发态产率与光激发能量的定量关系. 此外，基于实验，分别讨论了光激发强度对高能激子和双激子产率的影响，并与实验结果进行了比较. 最后，设定分子初始分别处于激子和双激子态，研究了分子内定域能级之间的受激辐射过程，并简单讨论了激子和双激子受激辐射与光激发能量及强度的关系.By applying a femtosecond electric pump pulse to a poly(p-phenylene vinylene) (PPV) molecule, we theoretically investigate the dynamical processes for its stimulated absorption and emission. The simulations are performed within the framework of an extended version of one-dimensional Su-Schrieffer-Heeger tight-binding model combined with a nonadiabatic evolution method. Firstly, we set the molecule initially lying in the ground state, by which we give the relation between different stimulated transition modes and the photoexciting pulse. Analysis of the final states shows that we can only obtain some electron-hole binding states by an external photoexcitation for the molecule, which includes exciton, biexciton, and high-energy exciton. We have calculated their yields and find that they are determined by the photoexciting energy. In addition, based on the experimental observations, we separately investigate the effect of the photoexciting intensity on the yields of biexciton and high-energy exciton. The calculated results are consistent with the corresponding experimental speculations. Finally, by setting the molecule lying in an exciton or a biexciton, we focus on the stimulated emission process between their generated intragap states. Effects of the photoexciting energy and intensity on them are separately analyzed. These results might be of great importance for further improving the optical applications of polymers, especially for optimizing the polymer photovoltaic and laser properties.
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Keywords:
- polymer /
- stimulated absorption /
- stimulated emission /
- exciton
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[1] Heeger A J, Kivelson S, Schreiffer J R 1988 Rev. Mod. Phys. 60 781
[2] Friend R H, Gymer R W, Holmes A B, Burroughes J H, Marks R N, Taliani C, Bradley D D C, Dos Santos D A, Brédas J L, Lögdlund M, Salaneck W R 1999 Nature 397 121
[3] Feng Z H, Hou Y B, Shi Q M, Liu X J, Teng F 2010 Chin. Phys. B 19 098601
[4] Tobjörk D, Kaihovirta N J, Mäkelä T, Pettersson F S, Österbacka R 2008 Org. Electron 9 931
[5] Hide F, DiazGarcia M A, Schwartz B J, Andersson M R, Pei Q B, Heeger A J 1996 Science 273 1833
[6] Samuel I D W, Turnbull G A 2007 Chem. Rev. 107 1272
[7] Wang L X, Zhang D C, Liu D S, Han S H, Xie S J 2003 Acta Phys. Sin. 52 2547(in Chinese) [王鹿霞, 张大成, 刘德胜, 韩圣浩, 解士杰 2003 物理学报 52 2547]
[8] Hendry E, Schins J M, Candeias L P, Siebbeles L D A, Bonn M 2004 Phys. Rev. Lett. 92 196601
[9] Virgili T, Marinotto D, Manzoni C, Cerullo G, Lanzani G 2005 Phys. Rev. Lett. 94 117402
[10] Sun X, Fu R L, Yonemitsu K, Nasu K 2000 Phys. Rev. Lett. 84 2830
[11] Paucka T, Henniga R, Pernera M, Lemmera U, Siegnera U, Mahrta R F, Scherfb U, Mllenb K, Bässlera H, Göbela E O 1995 Chem. Phys. Lett. 244 171
[12] Ruini A, Caldas M J, Bussi G, Molinari E 2002 Phys. Rev. Lett. 88 206403
[13] Gao K, Liu X J, Liu D S, Xie S J 2008 Phys. Lett. A 372 2490
[14] Wohlgenannt M, Tandon K, Mazumdar S, Ramasesha S, Vardeny Z V 2001 Nature 409 494
[15] Jailaubekov A E, Willard A P, Tritsch J R, Chan W L, Sai N, Gearba R, Kaake L G, Williams K J, Leung K, Rossky P J, Zhu X Y 2013 Nature Mater. 12 66
[16] Grancini1 G, Maiuri M, Fazzi D, Petrozza A, Egelhaaf H-J, Brida D, Cerullo G, Lanzani G 2013 Nature Mater. 12 29
[17] Bakulin A A, Rao A, Pavelyev V G, van Loosdrecht Paul H M, Pshenichnikov M S, Niedzialek D, Cornil J, Beljonne D, Friend R H 2012 Science 335 1340
[18] Gao K, Xie S J, Yin S, Liu D S 2011 Org. Electron. 12 1010
[19] Sun Z, Li Y, Gao K, Liu D S, An Z, Xie S J 2010 Org. Electron. 11 279
[20] Sun Z, An Z, Li Y, Liu W, Liu D S, Xie S J 2009 Acta Phys. Sin. 58 4150(in Chinese) [孙震, 安忠, 李元, 刘文, 刘德胜, 解士杰 2009 物理学报 58 4150]
[21] An Z, Wu C Q, Sun X 2004 Phys. Rev. Lett. 93 216407
[22] Gao K, Liu X J, Liu D S, Xie S J 2007 Phys. Rev. B 75 205412
[23] Chandross M, Mazumdar S, Jeglinski S, Wei X, Vardeny Z V, Kwock E W, Miller T M 1994 Phys. Rev. B 50 14702
[24] Su W P, Schrieffer J R, Heeger A J 1979 Phys. Rev. Lett. 42 1698
[25] Johansson A A, Stafström S 2004 Phys. Rev. B 69 235205
[26] Mizes H A, Conwell E M 1994 Phys. Rev. B 50 11243
[27] Liu D S, Zhao J Q, Wei J H, Xie S J, Mei L M 1999 Acta Phys. Sin. 48 1327(in Chinese) [刘德胜, 赵俊卿, 魏建华, 解士杰, 梅良模 1999 物理学报 48 1327]
[28] Colaneri N F, Bradley D D C, Friend R H, Burn P L, Holmes A B, Spangler C W 1990 Phys. Rev. B 42 11670
[29] Kraabel B, Klimov V I, Kohlman R, Xu S, Wang H L, McBranch D W 2000 Phys. Rev. B 61 8501
[30] Kranzelbinder G, Nisoli M, Stagira S, Silvestri S D, Lanzani G, Mllen K, Scherf U, Graupner W, Leising G 1997 Appl. Phys. Lett. 71 2725
[31] Klimov V I, McBranch D W, Barashkov N, Ferraris J 1998 Phys. Rev. B 58 7654
[32] Schindler F, Lupton J M, Mller J, Feldmann J, Scherf U 2006 Nature Mater 5 141
[33] Pramanik A, Kang H S 2011 J. Chem. Phys. 134 094702
[34] Mazumdar S, Guo F, Meissner K, Fluegel B, Peyghambarian N, Kuwata-Gonokami M, Sato Y, Ema K, Shimano R, Tokihiro T, Ezaki H, Hanamura E 1996 J. Chem. Phys. 104 9292
[35] Wang X D, Chen K, Sun X 2001 Synth. Met. 119 221
[36] Pasquinelli M A, Yaron D 2003 J. Chem. Phys. 118 8082
[37] Li S, Tong G P, George T F 2009 J. Phys. Chem. B 113 15231
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