Ir(PPY)3对Rubrene荧光材料的敏化性研究  

Phosphorescent Effect of Ir(ppy)_3 on the Luminescent Characteristic of Rubrene

作　　者：许洪华[1,2] 徐征[1] 张福俊[1] 赵谡玲[1] 袁广才[1] 陈跃宁[2] 

机构地区：[1]北京交通大学光电子技术研究所,北京交通大学发光与光信息技术教育部重点实验室,北京100044 [2]辽宁大学物理系,辽宁沈阳110036

出　　处：《光谱学与光谱分析》2008年第7期1608-1611,共4页Spectroscopy and Spectral Analysis

基　　金：“863”计划项目(2006AA03Z0412);国家自然科学基金项目(10774013,60576016);北京市自然科学基金项目(2073030);教育部博士点基金项目(20070004024);博士点新教师基金项目(2007004031);北京市科技新星计划项目(2007A024);教育部留学回国科研启动基金;校基金项目(2005SM057)资助

摘　　要：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。Many organic matters including heavy metal ions can validly utilize the singlet and triplet for luminescence owiog to the spin-orbit coupling. As a result, the internal quantum efficiency can easily achieve a value higher than traditional organic light emitting diodes in theory. There is a strong luminescence of PVK in PVK ： PBD ： Rubrene system. PL spectra excited by 345 nm of PVK ： PBD ： Rubrene thin film has a 410 nm PVK luminescent peak and a 560 nm Rubrene peak. EL still has a PVK luminescent peak, which should be kept from happening. Excitons can not adequately transferred from the matrix solution to Rubrene. The doping with Ir（ppy）3 improves the PVK ： PBD ： Rubrene system performance. PL spectra excited by 345 nm of PVK ： PBD ： Ir（ppy）3 ： Rubrene with low concentration of Rubrene has a 510 nm Ir（ppy）3 peak and a new 548 nm one. However, the Ir（ppy）3 peak is smaller and the Rubrene one is bigger in EL spectra. Notably a strong and single luminescence of Rubrene is obtained in EL and PL spectra excited by 345 nm of PVK ： PBD ： Ir（ppy）3 ： Rubrene with high concentration of Rubrene. Meanwhile, the Ir（ppy）3 luminescent peak disappears. The mechanism originates from the phosphorescent effect of Ir （ppy）3, The singlet excitons can basically be transferred from PVK ： PBD or Ir（ppy）3 to Rubrene. But most excitons from Ir （ppy）3 can directly tunnel to the fluorescent material and come into being singlet states that can return to ground states and cause luminescence. Rubrene can accept proportional excitons with low concentration. While the concentration of Rubrene is higher, excitons can be entirely accepted by Rubrene. The effect also restricts the luminescent intensity of Ir（ppy）3 and boosts up that of Rubrene. Furthermore, the energy transfer in PVK ： PBD ： Ir（ppy）3 ： Rubrene system is primary the Forester energy transfer. Excitation spectra of Rubrene and emission spectra of Ir（ppy）3 have a large overlap revealing that there is a str

关 键 词：Ir(ppy)3 RUBRENE 敏化 

分 类 号：O649[理学—物理化学]