Collaborative: Room-temperature electrophosphorescence from all-organic OLEDs

该计划的目标是利用纯有机材料开发室温电磷光（RT-EP）。这些材料被称为？分子合金吗?是有效的荧光粉，因为它们传输电荷，诱导从单线态到三重态激发态的系统间交叉，并将荧光粉锁定在一个矩阵中，防止它们的非辐射松弛。显示RT-EP的材料将使用光谱学和力显微镜（AFM， STM, C-AFM， KPM）进行研究。通过光致发光（PL）和光诱导吸收（PA）检测磁共振（分别为PLDMR和PADMR）来研究薄膜中的极化子/激子动力学，同时使用电致发光（EL）和电流检测来研究oled中的极化子和激子动力学。知识优点：纯有机材料的电磷光迄今为止仅在低温（~15 K）下观察到，这阻碍了实际应用。PVD材料称为？分子合金吗?在实验装置中允许高效（EQE~3%）的RT-EP。因此，旨在详细了解全有机磷基装置中发生的过程的研究是重要的。更广泛的影响是：提出基础科学：理解新的全有机材料，促进ISC，同时限制三重态的非辐射弛豫，并研究相应的oled物理将实现。节能相关性：有机发光二极管作为不需要贵金属/重金属的高效光源，将更加环保。跨学科教育：两个研究小组在PVD，材料化学，凝聚态物理，器件制造和表征方面的专业知识的合作将丰富教育，鼓励跨学科思维，促进学生交流。

The objective of this program is to develop room-temperature electrophosphorescence (RT-EP) utilizing purely organic materials. These materials termed ?molecular alloys? are efficient phosphors as they transport charge, induce intersystem crossing from the singlet to triplet excited state, and lock the phosphors in a matrix preventing their nonradiative relaxation. The materials displaying RT-EP will be investigated using optical spectroscopy and force microscopy (AFM, STM, C-AFM, KPM). Studies of polaron/exciton dynamics in films via photoluminescence (PL)- and photoinduced absorption (PA)-detected magnetic resonance (PLDMR and PADMR, respectively) will be carried out together with studies of polaron and exciton dynamics in the OLEDs using electroluminescence (EL)- and electrical current-detected The intellectual merit: Electrophosphorescence from purely organic materials has so far been observed only at low temperature (~15 K), which prevents practical applications. The PVD materials termed ?molecular alloys? allow for efficient (EQE~3%) RT-EP in experimental devices. Thus, studies aimed at detailed understanding of the processes taking place in the all-organic phosphors-based devices are important.The broader impacts are: Basic science proposed: An understanding of new all-organic materials that facilitate ISC while limiting nonradiative relaxation of the triplets and investigating physics of corresponding OLEDs will be achieved. Energy-conservation relevance: OLEDs as efficient light sources that would not require precious/heavy metals would be more environmentally friendly. Interdisciplinary Education: Collaboration between the two research groups with expertise in PVD, materials chemistry, condensed-matter physics, device fabrication and characterization will enrich education, encourage interdisciplinary thinking, and facilitate student exchange.