Development of Highly Efficient organic Electroluminescent Devices and Improvement of Their Stability

教授们。上海大学的张智林和蒋学银正在研究以N，N‘-二苯基-N，N’-二(3-甲基苯基)-L，1‘-联苯基4，4’-二胺(TPD)为空穴传输层，8-羟基喹啉铝(AlQ_3)为电子传输层，铟-锡氧化物(ITO)和镁-银(Mg-Ag)分别为正电极和负电极的有机电致发光器件。通过在有机薄膜电致发光器件的空穴传输层中掺杂Rubrene，器件的发光效率提高了50%以上(8918~13690 cd/m^&lt；n2&gt；)，器件的稳定性提高了10倍。将Rubrene引入空穴传输层(TPD)的EL器件，发光效率提高了70%，在初始亮度基础上的半衰期延长了10倍。张之琳和蒋雪银与长岛教授的研究小组--柴浦理工学院合作进行了有机EL…的研究更多的设备五年，包括这个项目的期限。张教授课题组在电致发光器件方面取得了丰硕的成果。张教授是电致发光现象和电致发光器件领域的领军人物。本课题得到国家自然科学基金资助。永原的研究小组，柴浦理工学院，正在研究一种有机电致发光器件，该器件使用了茂金属掺杂的聚(N-乙烯基咔唑)(PVCz)作为发光层。聚N-乙烯基咔唑具有较高的玻璃化转变温度。丁基苯基联苯氧烷(Bu-PBD)和8-羟基喹啉铝(AIQ)分别作为空穴阻隔层和电子传输层。采用铜酞菁(CuPc)作为空穴注入层。通过在聚偏氟乙烯中的掺杂得到了从紫蓝色到黄绿色的宽波长的电致发光电池，从载流子注入态的研究证明了电子可以直接注入到掺杂的紫外延产生的能级中，阐明了空穴阻挡层可以提高发光亮度和效率。电子传输层和空穴注入层。我们的实验结果表明，掺杂浓度和载流子注入平衡对获得高亮度和高效率有影响。用循环伏安法测量了有机材料和导电聚合物的能隙(最低未占用分子轨道(LUMO)能级和最高占用分子轨道(HOMO)能级之间的差)。较少

Profs. Zhang Zhi-lin and Jiang Xue-yin, Shanghai University, are studying for the organic electroluminescent devices constructed with N, N'-diphenyl-N, N'-bis (3-methylphenyl)-l, 1 '-biphenyl4, 4' diamine (TPD) as the hole transport layer, 8-hydroxyquinoline aluminium (Alq3) as the electron transport layer and indium-tin oxide (ITO) and Mg-Ag as positive and negative electrodes respectively. The luminescence efficiency of the devices was increasedmore than 50 % (8918 to 13690 cd/m^<n2>) and the stability of the devices was improved tenfold by the doping Rubrene into the hole transport layer of an organic thin film electroluminescent devices. The luminous efficinecy increased by 70% and the half decay time on the basis of initial luminance became longer ten times for the EL devices introduced rubrene into the hole transport layer (TPD).Profs. Zhang Zbi-lin and Jiang Xue-yin have cooperated research with Prof. Nagatomo's research group, Shibaura Institute of Technology, on the organic EL … More devices for five years including the term of this project. Prof. Zhang research group has given goods results on the EL devices. Prof. Zhang is the leading man in the field of electroluminescent phenomena and EL devices. This project was supported by the National Natural Science Foundation of China.Prof. Nagatomo's research group, Shibaura Institute of Technology, are studying for the organic electroluminescent devices used perylene-doped poly (N-vinyl carbazole)(PVCz) as the light emitting layer. Poly (N-vinyl carbazole) has the higher glass transition temperature. Butylphenyl biphenyl oxidiaylos (Bu-PBD) and 8-hydroxyuinoline aluminium (AIQ) were used as a hole-blocking layer and an electron transport layer, respectively. Copper phthalocyanine (CuPc) was used as a hole injection layer. The EL cells with a wide range of wavelength from purplish-blue to yellow-green colors have been obtained by perylene doping into PVCz, From the study of carrier injection states, it proved that the electron can be directly injected into the energy levels generated by doped perylene, It was clarified that the luminance and efficiency can be improved by a hole blocking layer. an electron transport layer and a hole injection layer. Our experimental results indicates that the dopant concentration and carrier injection balance have an influence on obtaining high luminance and efficiency.The energy gap (the difference between LUMO (Lowest Unoccupied Molecular Orbital) level and HOMO (Highest Occupied Molecular Orbital) level) of the organic materials and the conducting polymers was measured by the cyclic voltammetry method. Less