Organic Phosphorescence Emitter

Institution: University of Michigan

Summary
Organic Phosphorescence Emitter

Description
UM File # 3981

Background
Phosphorescent materials are enhancing and broadening the usefulness of organic compounds in a wide variety of applications. They increase organic light emitting diode efficiencies three-to-four fold, enhance organic photovoltaics, and provide unique sensitivity for chemical and cancer detection. Unfortunately, metal-free organics are intrinsically incapable of efficient phosphorescence, which restricts these fields to a relatively limited family of organometallics when designing new materials.

Technology Description
Researchers at University of Michigan have developed a series of pure organic phosphorescence compounds that are not emissive in solution but are emissive in liquid nitrogen. Also, when the organic phosphorescence compounds are mixed with similarly structured analogous organic crystal they produce 70% quantum yield in the solid- state at room temperature. When the crystal melts the emission disappears as well. Recrystallization of the melt brings the emission back. The pure analogous crystal matrix itself also has phosphorescence emission in liquid nitrogen but not at room temperature neither in solution. Several similar molecules with identical phenomena but different colors have also been developed by altering the chemical structure of the compounds.

Applications
• Solid-state lightning devices
• Flexible display fabrication
• Highly sensitive fluorescent sensor
• Organic laser and TFT
• Bioimaging

Advantages
• Photo-bleach free
• High quantum yield

Category
Materials

Contact Information
Nadine Wong
nwsk@umich.edu

Keywords
Specialty Materials