论文部分内容阅读
OLED技术被认为是最有可能取代液晶显示的全新技术,而OLED中的有机电致磷光器件是近年来的研究热点。有机电致磷光器件的发光层往往采用主客体掺杂体系,主客体分子内的能量传递是磷光发光体分子被激发的主要途径,因此选择吸收能量和传递能量好的主体材料是改进有机电致磷光器件性能的主要途径之一。文章分别以PVK和CBP作为主体材料,以磷光材料Ir(ppy)3和荧光材料Rubrene作为掺杂剂,制备了不同配比的器件,研究了主体材料和掺杂剂之间的能量传递特性。结果发现,这两种主体材料分别通过Ir(ppy)3向Rubrene传递能量是主要的能量传递机制,而且CBP作为主体时能量传递比PVK更充分。另外掺入Ir(ppy)3后的器件比不掺Ir(ppy)3的器件在相同电压下的光功率明显增强。当我们增加Ir(ppy)3的浓度时,相同电压下的光功率下降,浓度猝灭效应增强。
OLED technology is considered as the most likely to replace the new technology of liquid crystal display, and OLED in the organic electro-phosphorescent devices in recent years, research hot spots. Organic electroluminescent devices often use host-guest doping system of light-emitting layer doped host and guest molecules within the energy transfer is the main way phosphorescent emitter molecules are excited, so the choice of energy absorption and energy transfer of the host material is to improve the organic electrolysis One of the main ways of phosphorescent device performance. In this paper, PVK and CBP were used as the host materials, phosphorescent material Ir (ppy) 3 and rubrene as the dopant, respectively, to prepare different proportions of devices, and to study the energy transfer characteristics between the host material and the dopant. It was found that the energy transfer between these two host materials to Rubrene by Ir (ppy) 3 was the main energy transfer mechanism, and the energy transfer of CBP as the host was more complete than that of PVK. In addition, the device doped with Ir (ppy) 3 showed a significantly higher optical power at the same voltage than the device without Ir (ppy) 3. When we increase the concentration of Ir (ppy) 3, the optical power under the same voltage decreases and the quenching effect of concentration increases.