The Synthesis and Characterization of Phosphorescent Materials for Displays and Lighting Applications

Project: Research project

Project Details

Description

The Synthesis and Characterization of Phosphorescent Materials for Displays and Lighting Applications The Synthesis and Characterization of Phosphorescent Materials for Displays and Lighting Applications The proposed research seeks to further advance the field of PhOLEDs by developing several classes of metal complexes as blue-emitting, broadband or narrow-band phosphorescent emitters for lighting and displays applications. The specific sub-projects include: (1) four-coordinated platinum complexes for blue PhOLEDs, (2) donor-acceptor four-coordinated platinum and palladium complexes as broadband emitters and explore their use for lighting applications, (3) platinum complexes as narrow-band phosphorescent emitters for full color displays, (4) Iridium complexes with four-coordinated or six-coordinated ligand, (5) four-coordinated gold(III) complexes and (6) metal complexes including bridged cyclometalating ligands for use as host materials for organic light emitting devices and other applications. During the past two decades, OLEDs have received great interest from both the academic and industrial communities because they hold great promise for next-generation lighting and display technologies. There are two classes of emissive materials for OLED applications: fluorescent and phosphorescent dyes. The disadvantage of using fluorescent dyes is that, assuming no correlation between electrons and holes, 75% of electrically generated excitons are in the triplet state (spins parallel) and only 25% are in the singlet state (spin antiparallel). The only way to circumvent the efficiency problems associated with fluorescent dyes is the use of phosphorescent emitters like cyclometalated Ir and Pt complexes. Due to the strong spin-orbit coupling, these Ir and Pt complexes have high luminescent quantum yields and comparatively short phosphorescent lifetimes, making them ideal emissive dopants in OLEDs. By harvesting all the electrogenerated triplet and singlet excitons, a carefully designed device has been demonstrated to emit with nearly 100% internal quantum efficiency (IQE). Efficient red, green and blue OLEDs with selected Ir complexes have been reported, some of which are used in commercial OLED products with a device operational lifetime over 100,000 hrs or even longer. The current challenges for PhOLEDs include: (1) stable and efficient blue phosphorescent emitters, (2) broadband phosphorescent emitters for lighting and (3) narrowband phosphorescent emitters desirable for displays applications. The development of Stable Blue Emissive Materials for Displays and Lighting Applications The proposed research seeks to further advance the field of OLEDs by developing novel designs of efficient and stable light emitting material systems for applications to lighting and displays. The specific sub-projects include: (1) four-coordinated platinum complexes for blue PhOLEDs, (2) blue-emitting Pt-based emitters with 6-member coordination rings, (3) blue emitting Pt-based and Ir-based MADF emitters for organic light emitting devices and other applications, (4) preliminary testing of efficient blue fluorescent OLEDs employing phosphorescent and MADF materials as co-host materials. The development of Stable Blue Emissive Materials for Displays and Lighting Applications The development of Stable Blue Emissive Materials for Displays and Lighting Applications The development of Stable Blue Emissive Materials for Displays and Lighting Applications The development of Stable Blue Emissive Materials for Displays and Lighting Applications
StatusActive
Effective start/end date9/1/118/31/25

Funding

  • INDUSTRY: Domestic Company: $3,140,000.00

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