High Quantum Efficiency Coordination Polymers and Networks for OLED Application

1. High Quantum Efficiency Coordination Polymers and Networks for OLED Application Pavel Anzenbacher, Jr., Bowling Green State University, OH DMR 0306117 The objectives of this project are: • ●understanding fundamental relationships between the components in self-organized electroluminescent coordination materials, • ● design and synthesis of new OLED materials. • Results: • In the second year we continued the investigation of the impact of the HOMO-LUMO gaps in our electroluminescent complexes such as Alq3 with extended conjugated chromophores and its impact on the performance in actual OLED devices. Also, we have successfully accomplished the synthesis of the first synthesis of self-assembled electroluminescent coordination polymers and dendrimers, materials that will serve as emitters in high quantum efficiency OLED materials. Singlet emitters shown in the following scheme display quantum efficacy exceeding 5%. Ditopic ligands comprising two terminal hydroxyquinoline moieties and oligofluorene bridge fragment self-assemble in the presence of Al(III) ions into dendritic architectures. Significance of the results: • Self-assembled electroluminescent dendrimers show excellent stability and high quantum efficacy to be used in a future generation of long-lasting flat displays. Future plans: • We will focus on fabrication of OLED devices and display elements with high luminance and low power consumption (ideally powered by 9 V battery).

2. High Quantum Efficiency Coordination Polymers and Networks for OLED Application Pavel Anzenbacher, Jr., Bowling Green State University, OH DMR 0306117 During the summer of 2004 our group hosted another student (Sherrell Turner) with a scholarship awarded by BGSU's Academic Investment in Math and Science program. Both of these students belonging to an underrepresented group were supervised by the PI’s and his graduate students and expressed their excitement and strengthened interest in the chemistry and in science in general. As a result of his summer experience Mr. Perez decided to pursue a Ph.D. degree in my research group. This summer our group was happy to welcome yet another “minority” graduate student, Mr. Leandro Estrada, who has begun working on this project . Education: The work on this project includes both graduate and undergraduate students as well as a post-doctoral associate who work together in this interdisciplinary field involving photochemistry, physics, and chemistry of materials. Outreach: This PI is actively involved in summer programs focused on attracting minority students to study natural sciences. In the last two years two undergraduate students have been involved in the work on this project. One of them (Cesar Perez) was a participant in the NSF-REU program. Ms. Sherrell Turner enjoying her hands-on experience in the PI’s laboratory. Leandro and Victor, two graduate students and Dr. Anzenbacher performing an experiment using a single-photon counting fluorimeter.