近红外有机电致发光材料的合成与表征

发布时间：2018-04-01 19:23

  本文选题：近红外　切入点：有机电致发光二极管　出处：《郑州大学》2015年硕士论文

【摘要】：近年来,近红外有机电致发光二极管(OLED)引起了人们越来越大的兴趣,在近红外OLED器件中给体-受体-给体(D-A-D)型发色团是一类最重要的NIR材料。因此,本文选用富电子的咔唑、吩噻嗪、三苯胺等衍生物作为电子给体,缺电子的苯并噻二唑和苯并硒二唑衍生物作为电子受体,通过SUZUKI偶联反应合成了一系列D-A-D型NIR发光材料并对其进行表征。最后,我们将目标产物旋涂在ITO上作为活性发光层制备了一系列电致发光器件并测试了其发光性能。在分子设计中,本文首先在给体中引入柔性链对目标产物的溶解性进行调控;其次通过改变给体和受体对目标产物的带隙进行调控,最终使得吸收和发射波长红移至近红外光区。采用1H-NMR、IR、EA等分析方法对NIR发光材料的结构进行分析;通过TG、DSC等对其热稳定性进行分析,结果表明,这五个目标产物的分解温度均在350℃以上,都具有良好的热稳定性;通过UV-vis对其溶液的吸收性能进行分析,它们的最大吸收波长在505-575 nm范围内,计算得它们的能带隙在2.09-1.80 e V范围内,说明这五个目标产物都具有较小的能带隙;通过FL对其THF溶液的荧光发射性能进行分析,它们的最大发射波长在668-756 nm范围内;通过EL对其电致发光性能进行分析,发现它们的OLED器件的发射波长在675-802 nm范围内,最终移至近红外光区。结果表明,在分子结构中引入噻吩基团或者将S原子换成Se原子都可以使得吸收波长和发射波长红移,并且减少能带隙。本文最后又以三苯胺(TPA)为核、苯并三氮唑(BTz)为支链通过SUZUKI偶联反应合成了一种超支化共轭聚合物HPTPA-BTz及其模型化合物TPA-BTz,并通过1H-NMR、IR、凝胶渗透色谱(GPC)等对其结构和分子量进行表征。所得聚合物的Mn为0.46×104,Mw为1.26×104。测定了HPTPA-BTz和TPA-BTz在THF溶剂中的UV-vis、FL及其荧光寿命,它们在THF溶剂中的荧光发射峰均为524nm,HPTPA-BTz和TPA-BTz的荧光寿命分别为3.08ns、4.70ns。最后探讨了该聚合物的电致发光性能,其OLED器件的发射波长为523nm。
[Abstract]:In recent years, the near infrared organic light-emitting diode (Ole) has attracted more and more attention. In the near infrared OLED devices, donor-receptor-donor D-A-D) chromophore is the most important kind of NIR material. A series of NIR luminescent materials of D-A-D type were synthesized and characterized by SUZUKI coupling reaction, using phenothiazine, trianiline and other derivatives as electron donors and benzoxadiazole and benzoselenediazole derivatives as electron receptors. A series of electroluminescent devices were prepared by spin-coating the target product on ITO as active luminescent layer and their luminescence properties were tested. In the molecular design, flexible chains were introduced into the donor to regulate the solubility of the target product. Secondly, by changing the donor and receptor to regulate the band gap of the target product, the absorption and emission wavelength is red shifted to the near infrared region. The structure of NIR luminescent material is analyzed by 1H-NMR-IREA and other methods. The results show that the decomposition temperature of the five target products is above 350 鈩，

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