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最近几年,磷光器件是有机电致发光研究领域和产业化的一大热点。在实验中作者发现PVK∶PBD∶Rubrene共掺体系的发光中存在较强的PVK发光,能量传递不充分。由于一些具有重金属离子的有机物,存在强的自旋-轨道耦合作用,引入到共掺体系可以充分利用单线态和三线态的发光,从而获得高于一般有机材料器件所达到的内量子效率。为获得单色性较好的Rubrene发光,作者将磷光敏化剂Ir(ppy)3引入到PVK∶PBD∶Rubrene共掺溶液中,得到了纯正Rubrene发光,Forester能量传递也更加充分。当进一步提高Rubrene掺杂浓度以后,单色性Rubrene发光更加明显,并讨论了Ir(ppy)3所起的作用和器件的发光机理。磷光材料与有机小分子材料共掺的方法,可以有效提高器件的发光亮度及效率。
In recent years, phosphorescent devices are a hot topic in the field of organic electroluminescence and industrialization. In the experiment, the author found that PVK: PBD: Rubrene co-doped system in the strong PVK luminescence, energy transfer is not sufficient. Due to the strong spin-orbit coupling effect of some organic compounds with heavy metal ions, the introduction into the co-doped system can make full use of the singlet and triplet luminescence to achieve higher internal quantum efficiency than that of the general organic material devices. In order to obtain the better monochromatic Rubrene luminescence, the author introduced the phosphorescent Ir (ppy) 3 into the PVK: PBD: Rubrene co-doped solution, resulting in the pure Rubrene luminescence and the Forester energy transfer more fully. When Rubrene doping concentration is further increased, monochromatic Rubrene luminescence is more obvious, and the role of Ir (ppy) 3 and the luminescence mechanism of the device are discussed. Phosphorescent materials and organic small molecule co-doped material, which can effectively improve the brightness and efficiency of the device.