低单线态-三线态交换能材料及其高效率白光OLED器件

项目名称： 低单线态-三线态交换能材料及其高效率白光OLED器件

项目编号： No.91233116

项目类型： 重大研究计划

立项/批准年度： 2013

项目学科： 有机高分子材料学科

项目作者： 苏仕健

作者单位： 华南理工大学

项目金额： 80万元

中文摘要： 伴随着有机电致发光器件（OLED）在显示和照明技术上应用的逐步推进，提高白光OLED器件的发光效率，可在更大程度上实现电能的高效利用。本项目将设计与合成同时具有较低单线态能级和较高三线态能级的有机半导体材料并将其用于发光材料和磷光材料用主体材料。通过降低其单线态和三线态间的能级差实现三线态激发态到单线态激发态的上转换及因此而产生的热活化滞后荧光，以提高荧光发射效率。同时，因其较高的三线态能级可抑制来自磷光材料三线态激发态的能量转移，以提高磷光发射效率。在此基础上设计制作新型荧光/磷光杂化白光OLED器件，通过改善其荧光和磷光发射效率、降低驱动电压等，为白光OLED器件功率效率和寿命的改善提供新的思路。该项目的实施将对白光OLED照明技术开发提供从材料到器件设计的理论和实践指导，进而推动其在显示和固态照明上的应用研究。

中文关键词： 单线态-三线态交换能；热活化延迟荧光；磷光；白色发光；有机电致发光器件

英文摘要： White organic light-emitting devices (OLEDs) have become of considerable commercialization interest in recent years for the fabrication of next-generation full-color displays with color filters or as solid state lighting panels. Improvement of luminous efficiency of the white OLEDs is of importance for the efficient usage of electrical power.In this study, we will design and synthesize a series of oragnic materials with a small singlet-triplet exchange energy and a high triplet energy for both light-emitting material and host material to give highly efficient fluorescent/phosphorescent hybrid white OLEDs. By lowering their energy gaps between singlet and triplet excited states, up-conversion of triplet excitons into a singlet state can be realized to give thermally activated delayed fluorescence (TADF) and thus an improved fluorescence radiative efficiency. In addition, due to their high triplet energy, improvement of phosphorescence efficiency is also expectable because of triplet energy confinement on the phosphorescent emitters. Moreover, novel fluorescence / phosphorescence hybrid white OLEDs will be designed and fabricated with these materials to achieve high luminous efficiency, low driving voltage, and long lifetime.

英文关键词： singlet-triplet energy gap；thermally activated delayed fluorescence；phosphorescence；white light-emitting；organic light-emitting device