新型（艹北）聚酰亚胺发光二极管的研究

【作者】 王建浦；

【导师】 刘旭；

【作者基本信息】 浙江大学 ， 光学工程， 2003， 硕士

【摘要】 作为未来平板显示最有力竞争者的聚合物发光二极管由于众多优异表现而引起越来越多研究者的兴趣。本文研究了染料小分子苝键合在聚酰亚胺主链上的新型苝聚酰亚胺PFB5与PFF5的光致发光性质，以及发光二极管的制备与特性分析，可调谐微腔聚合物电致发光二极管的设计和模拟结果，聚合物链内的能量转移现象，主要涉及以下几个方面内容： 1．对新型苝聚酰亚胺(PFB5)的物理特性、溶液和薄膜状态下的荧光特性进行了研究。利用PFB5作为发射层，掺杂不同含量的电子传输材料PBD，研制单层的聚合物发光二极管，以及研制ITO/PFB5/PBD/Al和ITO/PFB5/Alq/Al多层的聚合物发光二极管，研究器件的伏安特性、电压亮度特性和电致发光光谱。 2．对具有较强的电子传导能力的另一种新型苝聚酰亚胺(PFB5)的物理特性、溶液和薄膜状态下的荧光特性进行了研究。利用PFF5作为发射层，研制单层高效的聚合物发光二极管，研究器件的伏安特性、电压亮度特性和电致发光光谱。 3．对链内键合染料小分子聚合物LED的能量转移现象进行了研究。我们知道，在小分子LED中，主体到客体染料分子的能量转移可以实现不同的颜色，以及提高发光效率。在聚合物LED中，我们也发现了从在链内的主体到客体染料的能量转移。这对实现聚合物发光二极管的全色显示和提高发光效率有着重要的意义。 4．实现全色显示的一种有效方法就是利用微腔来控制发射波长。利用液晶材料的双折射特性，我们设计了一种新的波长可调谐微腔有机电致发光二极管器件。通过对液晶施加一定的交流电压，可以很容易地实现发光波长的连续调谐，通过模拟计算表明这种器件的可调谐范围可以达到60nm，半宽度为18.5nm。本文的创新点在于： 1．研究了含苝的聚酰亚胺的荧光特性和电致发光特性。 2．对聚酰亚胺链内的能量转移现象进行了研究。 3．对可调谐的微腔聚合物电致发光二极管进行了研究。更多还原

【Abstract】 There are increasing researchers show interest in polymer light-emitting diodes (PLED),and people believe that PLED will be the most powerful competitor for panel display in future. This paper is about a novel PLED with fluorene-based cardo perylene polyimide (PFB5) and a fluorine contained PFB5,PFF5 as the emitter. The research work in this paper is as follows.1. Study on the physical character,chemical character of PFB5,and the UV and photoluminescence (PL) spectra of PFB5 in chloroform solution and in film state. Using PFB5 or PFB5 doped with PBD as the emitter,we fabricate single layer polymer LED. Also multiplayer devices,ITO/PFB5/PBD/A1 and ITO/PFB5/Alq/Al have been fabricated. Finally,we got these devices’ I-V curve,V-brightness curve,and spectra.2. Another fluorine-contained polyimide,named PFF5,which has the ability to transfer electron,has been studied too. Similar to PFB5,this polymer has high thermal stability,and the TG is above 330. Excitation at 493nm,the emission peaks of PFF5 in chloroform solution is 540nm and 580nm. Using PFF5 as the emitter,an efficiency single layer LED has been fabricated.3. In the system of PFB5 and PFF5,fluorene units and perylene units were incorporated into polyimide chain. As we know,in the molecule light emitting diodes,to get color tunable and high efficiency,there are energy shift from host to dopant. In the PFB5 and PFF5 LED,we also find the energy shift from host to dopant intra-chain. And it will be a new way to realize high stability and efficiency polymer LED.4. An approach to realize all-color display is using micro-cavity effect for polymer LED. Using the bi-refraction effect of liquid crystal,we design a novel wavelength tunable micro-cavity polymer LED. Exert a voltage to liquid crystal;it will be realize the emission wavelength tunable. The simulation indicates that the tunable range can approach 60nm,and the FWHM is 18. 5 nra.The innovation of this paper can be expressed in 6 points:1. Study on the PL and EL character of fluorene-based cardo perylene polyimide,PFB5 and PFF5.2. Do research on the intra-chain energy shift of the polyimide.3. Do research on the tunable micro-cavity polyimide light-emitting diodes.更多还原