光学学报, 2006, 26 (4): 585, 网络出版: 2006-05-17   

有机材料激子发光的温度特性

Temperature-Dependent Luminescence Originating from the Recombination of Excitons in Organic Light-Emitting Materials
作者单位
摘要
基于实验和理论模拟研究了12~320 K温度范围内八羟基喹啉铝[tris-(8-hydroxyquinoline) aluminum,Alq]和一种高效红光染料甲基2叔丁基6(1,1,7,7四甲基久咯呢定基9烯基)4H1吡喃[4-(dicyanomethylene)-2-t-butyl-6(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran,DCJTB]的光致发光(photoluminescence,PL)随温度的变化,提出三种不同电荷分离程度的激子参与的Alq的稳态光致发光过程,通过拟合参量得到了三种激子的能量差值和辐射复合几率之比,观察并解释了DCJTB发光光谱从200 K以下到室温的升温过程中发生的蓝移。认为变温光致发光有可能用于评估材料的发光和导电性能,比较并讨论了有机和无机发光材料激子发光的温度特性,认为低温下小分子发光材料倾向于分子态,随温度升高逐渐向半导体态转变,Alq在150~190K之间开始发生这种转变,而DCJTB则从300~320 K开始。
Abstract
Based on experimental measurement and theoretical simulation, the temperature dependence of the photoluminescence (PL) of amorphous thin films of tris-(8-hydroxyquinoline) aluminum (Alq) and 4-(dicyanomethylene)-2-t-butyl-6(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran (DCJTB) has been studied. It is proposed that three types of excitons with different charge separations are involved in the steady state PL process, which, with increasing energy, are accordingly called intra-molecule localized, intra-molecule delocalized, and inter-molecule delocalized, while the corresponding radiative decay rates are relatively low, high, and negligible, respectively. The blue shift of the DCJTB PL spectra with increasing temperature has been observed and explained. It is suggested that the temperature-dependent PL could be possibly used to evaluate the radiative and conductive characteristics of organic emitters and to distinguish whether a given material would be of molecular or semiconductor properties.
参考文献

[1] . E. Burrows, Z. Shen, V. Bulovic et al.. Relationship between electroluminescence and current transport in organic heterojunction light-emitting devices[J]. J. Appl. Phys., 1996, 79(10): 7991-8006.

[2] . J. Curry, W. P. Gillin. Radiative recombination mechanisms in aluminum tris(8-hydroxyquinoline):Evidence for triplet exciton recombination[J]. J. Appl. Phys., 2000, 88(2): 781-785.

[3] . K. Saha, Y. K. Su, F. S. Juang. Temperature- and field-dependent quantum efficiency in tris-(8-hydroxy) quinoline aluminum light-emitting diodes[J]. J. Appl. Phys., 2001, 89(12): 8175-8178.

[4] . Kwong, Peter Djurovich et al.. Endothermic energy transfer: A mechanism for generating very efficient high-energy phosphorescent emission in organic materials[J]. Appl. Phys. Lett., 2001, 79(13): 2082-2084.

[5] E. J. W. List, C. Creely, G. Leising et al.. Excitation energy migration in highly emissive semiconducting polymers[J]. Chem. Phys. Lett., 2000, 325(1~3): 132~138

[6] . . High-temperature operation of an electroluminescent device fabricated using a novel triphenylamine derivative[J]. Appl. Phys. Lett., 1996, 69(7): 878-880.

[7] . D. Jung, D. H. Hwang, T. Zyung et al.. Temperature dependent photoluminescence and electroluminescence properties of polythiophene with hydrogen bonding side chain[J]. Synthetic Metals, 1998, 98: 107-111.

[8] . . Temperature-dependent luminescent properties of Eu-Tb complexes synthesized in situ in gel glass[J]. Appl. Phys. Lett., 2005, 86(7): 071907-1.

[9] Pankove J I. Optical Processes in Semiconductors[M]. New York: Dover, 1975

[10] Fang Junxin, Lu Dong. Solid State Physics[M]. Shanghai : Shanghai Science and Technology Publishers, 1980. 436 (in Chinese)
方俊鑫,陆栋. 固体物理[M]. 上海: 上海科学技术出版社, 1980. 436

[11] . Colle, C. Garditz. Phosphorescence of aluminum tris(quinoline-8-olate)[J]. Appl. Phys. Lett., 2004, 84(16): 3160-3162.

[12] . Colle, W. Brütting. Thermal, structural and photophysical properties of the organic semiconductor Alq3[J]. Phys. Stat. Sol. (A), 2004, 201(6): 1095-1115.

[13] . . Characterization of the triplet state of tris(8-hydroxyquinoline)aluminium(Ⅲ) in benzene solution[J]. J. Am. Chem. Soc., 2003, 125(50): 15310-15311.

[14] Pope M, Swenberg C E. Electron Processes in Organic Crystals[M]. Oxford: Clarendon, 1982. 73

[15] . . Temperature dependence of photoluminescence intensity from AlGaInP/GaInP-quantum well structures[J]. J. Appl. Phys., 1997, 82(3): 1336-1344.

[16] A. Bolognesi, C. Botta, L. Cecchinato. Optical properties and electroluminescence of poly(3-alkylmethoxy-thiophene) single- and double-layer structures[J]. Synthetic Metals, 2000, 111~112: 187~189

[17] . Kohler, D. Ados Santos, D. Beljonne et al.. Charge separation in localized and delocalized electronic states in polymeric semiconductors[J]. Nature, 1998, 392(6679): 903-906.

[18] Berleb S, Muckl A G, et al.. Temperature dependent device characteristics of organic light-emitting devices[J]. Synth. Met., 2000, 111~112: 341~344

[19] . W. Tang, S. A. VanSlykex, C. H. Chen et al.. Electroluminescence of doped organic thin films[J]. J. Appl. Phys., 1989, 65(9): 3610-3616.

[20] Ignacio Martini, Bin Ma, Tatiane Da Ros et al.. Ultrafast competition between energy and charge transfer in a functionalized electron donor/fullerene derivative[J]. Chem. Phys. Lett., 2000, 327(5~6): 253~262

[21] Zhang Xiqing, Mei Zengxia, Duan Ning et al.. Exciton optical properties of CdSe/CdZnSe superlattices[J]. Acta Optica Sinca, 2002, 22(1): 114~117 (in Chinese)
张希清,梅增霞,段宁 等. CdSe/CdZnSe超晶格的激子光学性质的研究[J]. 光学学报, 2002, 22(1): 114~117

[22] Ma Guohong, Guo Lijun, Yang Yi et al.. Investigations of excited state dynamics of a PPV derivative using ultrafast Kerr spectroscopy[J]. Acta Optica Sinca, 2002, 22(8): 916~920 (in Chinese)
马国宝,郭立俊,杨毅 等. PPV衍生物的激发态动力学特征研究[J]. 光学学报, 2002, 22(8): 916~920

[23] Xia Haiping, Song Hongwei, Zhang Jianli et al.. Preparation of Na2O·K2O·SiO2·Al2O3 glass containing Eu3+ ions and its temperature-dependence of fluorescence spectra and structure[J]. Acta Optica Sinca, 2002, 22(12): 1488~1492 (in Chinese)
夏海平,宋宏伟,章践立 等. 含Eu3+离子的Na2O·K2O·SiO2·Al2O3系统玻璃的制备及其变温发射光谱与结构特性[J]. 光学学报, 2002, 22(12): 1488~1492

钟高余, 林剑, 王美良, 夏亿劼, 尹琨, 黄维. 有机材料激子发光的温度特性[J]. 光学学报, 2006, 26(4): 585. 钟高余, 林剑, 王美良, 夏亿劼, 尹琨, 黄维. Temperature-Dependent Luminescence Originating from the Recombination of Excitons in Organic Light-Emitting Materials[J]. Acta Optica Sinica, 2006, 26(4): 585.

本文已被 1 篇论文引用
被引统计数据来源于中国光学期刊网
引用该论文: TXT   |   EndNote

相关论文

加载中...

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!