卟啉掺杂MEH-PPV的发光性能  

Luminescent Properties of Porphyrin Doped Poly [2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylenevinylene]

作　　者：吴俊[1] 钟国伦[1] 孙建中[2] 王金浩[3] 夏海平[3] 

机构地区：[1]浙江大学宁波理工学院生物与化学工程分院,浙江宁波315100 [2]浙江大学材料与化学工程学院,浙江杭州310027 [3]宁波大学光电子功能材料研究所,浙江宁波315211

出　　处：《发光学报》2008年第2期259-263,共5页Chinese Journal of Luminescence

基　　金：宁波市自然科学基金(2006A610068);浙江大学宁波理工学院人才引进基金资助项目

摘　　要：研究了在聚(2-甲氧基,5-(2′乙基-己氧基)-对苯乙炔)(MEH-PPV)中掺杂不同质量分数的四对甲基苯基卟啉(TTP)薄膜材料的光致发光和电致发光性能,结果表明,在这个复合体系中存在着从MEH-PPV到TTP的Frster能量转移,从而导致了强的TTP的饱和红光发射。另一方面,在电致发光中TTP的发射除了来自于从MEH-PPV的能量转移外,还来自于自身对载流子的捕获,TTP掺杂的MEH-PPV组成的薄膜复合材料的光致发光和电致发光过程遵循不同的机理。Organic light-emitting diodes （OLEDs） based on conjugated polymers have been attracting much attention because of their cheap and easy fabrication with solution-based processing techniques. Full color displays based on organic materials have very attractive prospects and one of the most exciting ones is the use of ink-jet printing to allow direct patterning of conjugated polymer LED pixels. However, achieving ＂pure-red＂ emission has proved relatively challenging. In this work the optical properties of varying 5,10,15,20-tetra-ptolyl-21H, 23H-porphine （TIP） doped poly [ 2-methoxy-5- （ 2＇-ethylhexyloxy ） -1,4-phenylenevinylene ] （MEH-PPV） were studied. The UV-Vis absorption of Q-band of TTP overlapped the photoluminescent spectra of MEH-PPV. This is a priority for occurrence of Forster-type energy transfer. The photoluminescent spectra of varying TTP doped MEH-PPV showed that the emission of TTP increased as the increasing of the doping level at the excitation wavelength of 500 nm, at which TIP didn＇ t absorb energy, indicating the existence of Forster energy transfer from MEH-PPV to TTP. However, the continuous addition of TTP resulted in the enhanced emission of MEH-PPV at the doping level above 4 percent, due to the self-quenching caused by crystallization of TTP. The devices with varying TTP doped MEH-PPV as light-emitting layers were also fabricated and the structure of the devices was ITO/PEDOT ： PSS/TTP doped MEH-PPV/Al [ PEDOT ： PSS = poly （ 2,3-dihydrothieno[3,4-b]-1 ,4-dioxin）/ poly（styrenesulfonate） ]. The layers of PEDOT/PSS （20 nm） and doped polymers （80 nm） were spun onto ITO substrates and aluminum cathode （100 nm） was deposited under vacuum pressure of about 1 ×10^-3 Pa. The electroluminescent properties of the devices were investigated and TTP dominated red emission was observed. The electroluminescent emission from TIP increased as the increasing of doping level in light-emitting layer. On the other hand, the emission of MEH-PPV reduced gradually un

关 键 词：有机电致发光 卟啉 能量转移 

分 类 号：O482.31[理学—固体物理] TN383.1[理学—物理]