Collaborative: Room-temperature electrophosphorescence from all-organic OLEDs

合作：全有机 OLED 的室温电致磷光

• 批准号: 1202439
• 负责人: Pavel Anzenbacher
• 金额: $ 25.57万
• 依托单位: Bowling Green State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-08-15 至 2016-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1202439&HistoricalAwards=false
• 关键词: Collaborative; Room; temperature; electrophosphorescence; organic

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 magnetic resonance (ELDMR and EDMR, respectively).Intellectual merit: 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.Broader impact: 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.

该计划的目标是开发利用纯有机材料的室温电致磷光（RT-EP）。这些材料被称为？分子合金？是有效的磷光体，因为它们传输电荷，诱导从单重态到三重态激发态的系间交叉，并将磷光体锁定在基质中，防止它们的非辐射弛豫。显示RT-EP的材料将使用光学光谱和力显微镜（AFM，STM，C-AFM，KPM）进行研究。光致发光（PL）和光诱导吸收（PA）磁共振研究薄膜中极化子/激子动力学（分别为PLDMR和PADMR）将与使用电致发光（EL）和电流检测的磁共振研究OLED中的极化子和激子动力学一起进行（分别为ELDMR和EDMR）。智力价值：智力价值：迄今为止，仅在低温（~15 K）下观察到纯有机材料的电致磷光，这阻碍了实际应用。PVD材料的定义？分子合金？允许在实验装置中进行有效的（EQE~3%）RT-EP。更广泛的影响：更广泛的影响是：基础科学的建议：了解新的全有机材料，促进ISC，同时限制三重态的非辐射弛豫，并研究相应的OLED的物理。节能相关性：有机发光二极管作为高效光源，不需要贵金属/重金属，对环境更加友好。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之间的合作将丰富教育，鼓励跨学科思维，并促进学生交流。