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科学通报  2015 

激子态和电荷转移态共存的聚合物发光器件中单重态与三重态之间的自旋混合过程

DOI: 10.1360/N972014-01281, PP. 3125-3132

Keywords: 有机发光器件,电荷转移态,系间窜越,磁效应

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Abstract:

在poly[{9,9-dioctyl-2,7-divinylenefluorenylene)-alto-co-(2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylene}](PFOPV)发光材料中同时存在激子态和电荷转移态的辐射退激过程.本文制备了基于PFOPV的发光器件,并以发光和电流的磁场效应为手段研究了这2种发光过程的微观差异.实验发现,在室温下,载流子注入平衡器件的磁电致发光表现为负效应,而非平衡器件的磁电致发光表现正效应;低温下,平衡器件的磁电致发光会随着注入电流的增加出现由负到正的转变,但磁电导却始终呈现为负值.磁效应与载流子注入情况、温度和注入电流的这些依赖关系可归结为两发光过程在器件中相互竞争的结果.分析表明两过程磁效应的差异是由超精细相互作用诱导的系间窜越和反系间窜越作用共同引起的.本研究工作证明了电荷转移态对提高荧光有机发光器件的发光效率具有重要的参考价值.

References

[1]  1 Tang C W, VanSlyke S A. Organic electroluminescent diodes. Appl Phys Lett, 1987, 51:913-915
[2]  2 Burroughes J, Bradley D, Brown A, et al. Light-emitting diodes based on conjugated polymers. Nature, 1990, 347:539-541
[3]  3 Reineke S, Thomschke M, Lüssem B, et al. White organic light-emitting diodes:Status and perspective. Rev Mod Phys, 2013, 85:1245
[4]  4 Kalinowski J. Excimers and exciplexes in organic electroluminescence. In:11th International Conference on Electrical and Related Properties of Organic Solids (ERPOS-11). Poland:Mater Sci Poland, 2009. 735-756
[5]  5 Chen P, Li M, Peng Q, et al. Direct evidence for the electron-hole pair mechanism by studying the organic magneto-electroluminescence based on charge-transfer states. Org Electron, 2012, 13:1774-1778
[6]  6 Feng J, Li F, Gao W, et al. White light emission from exciplex using tris-(8-hydroxyquinoline) aluminum as chromaticity-tuning layer. Appl Phys Lett, 2001, 78:3947-3949
[7]  7 Goushi K, Yoshida K, Sato K, et al. Organic light-emitting diodes employing efficient reverse intersystem crossing for triplet-to-singlet state conversion. Nature Photon, 2012, 6:253-258
[8]  8 Castellani M, Berner D. Competition between excitons and exciplexes:Experiments on multilayered organic light emitting diodes. J Appl Phys, 2007, 102:024509
[9]  9 Gebler D, Wang Y, Blatchford J, et al. Exciplex emission in bilayer polymer light-emitting devices. Appl Phys Lett, 1997, 70:1644-1646
[10]  10 Adachi C, Tsutsui T, Saito S. Blue light-emitting organic electroluminescent devices. Appl Phys Lett, 1990, 56:799-801
[11]  11 Li Z L, Meng H F, Horng S F, et al. Strong red emission in heterojunctions of conjugated polymer blends. Appl Phys Lett, 2004, 84:4944-4946
[12]  12 Goushi K, Adachi C. Efficient organic light-emitting diodes through up-conversion from triplet to singlet excited states of exciplexes. Appl Phys Lett, 2012, 101:023306
[13]  13 Uoyama H, Goushi K, Shizu K, et al. Highly efficient organic light-emitting diodes from delayed fluorescence. Nature, 2012, 492:234-238
[14]  14 Endo A, Ogasawara M, Takahashi A, et al. Thermally activated delayed fluorescence from sn4+-porphyrin complexes and their application to organic light emitting diodes-a novel mechanism for electroluminescence. Adv Mater, 2009, 21:4802-4806
[15]  15 Zhang Q, Li J, Shizu K, et al. Design of efficient thermally activated delayed fluorescence materials for pure blue organic light emitting diodes. J Am Chem Soc, 2012, 134:14706-14709
[16]  16 Kondakov D, Pawlik T, Hatwar T, et al. Triplet annihilation exceeding spin statistical limit in highly efficient fluorescent organic light-emitting diodes. J Appl Phys, 2009, 106:124510
[17]  17 Lei Y L, Song Q L, Chen P, et al. Large contribution of triplet excitons to electro-fluorescence in small molecular organic light-emitting diodes. Org Electron, 2011, 12:1512-1517
[18]  18 Lei Y L, Zhang Y, Liu R, et al. Driving current and temperature dependent magnetic-field modulated electroluminescence in Alq3-based organic light emitting diode. Org Electron, 2009, 10:889-894
[19]  19 Huang C H, Li F Y, Huang W. Introduction to Organic Electroluminescent Light-emitting Materials and Devices (in Chinese). Shanghai:Fudan University Press, 2005[黄春晖, 李富友, 黄维. 有机电致发光材料与器件导论. 上海:复旦大学出版社,
[20]  20 Iacopino D, Redmond G. Synthesis, optical properties and alignment of poly(9,9-dioctylfuorene) nanofibers. Nanotechnology, 2014, 25:435607
[21]  21 Hashim Z, Howes P, Green M. Luminescent quantum-dot-sized conjugated polymer nanoparticles-Nanoparticle formation in a miniemulsion system. J Mater Chem, 2011, 21:1797
[22]  22 Zhang Q M, Lei Y L, Xiong Z H, et al. Positive and negative components of magnetocoductance in hole transport limited organic light-emitting diodes. Appl Phys Lett, 2011, 98:243303
[23]  23 Chen P, Xiong Z, Peng Q, et al. Magneto-electroluminescence as a tool to discern the origin of delayed fluorescence:Reverse intersystem crossing or triplet-triplet annihilation? Adv Opt Mater, 2014, 2:142-148
[24]  24 Peng Q, Li A, Fan Y, et al. Studying the influence of triplet deactivation on the singlet-triplet inter-conversion in intra-molecular charge-transfer fluorescence-based OLEDs by magneto-electroluminescence. J Mater Chem C, 2014, 2:6264
[25]  25 Bai J W, Zhang Q M, Lei Y L, et al. The influence of polarization in LiF molecules on the magneticfield effects in OLEDs (in Chinese). Chin Sci Bull, 2013, 58:3045-3051[白江文, 张巧明, 雷衍连, 等. LiF分子的极化对有机发光二极管磁效应的影响. 科学通报, 2013, 58:3045-
[26]  26 Shao M, Yan L, Li M, et al. Triplet-charge annihilation versus triplet-triplet annihilation in organic semiconductors. J Mater Chem C, 2013, 1:1330
[27]  27 Zhang Y, Zhang Q M, Liu Y L, et al. Positive-negative inversion of magnetoconduce in Alq3-based organic light-emitting diode (in Chinese). Chin Sci Bull, 2011, 56:1425-1430[张勇, 张巧明, 刘亚莉, 等. Alq3有机发光二极管中的正负磁电导转变. 科学通报, 2011, 56:1425-

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