Electroluminescent Nanocrystal/Quantum Dot Based Phosphors

This proposal aims at demonstrating full color large area lamps and pixelated flat panel displays using novel high brightness and fast response cladded nanosphosphores (e.g. ZnCdSe-ZnSe/ZnMgSe cladded quatum dots). These cladded quantum dots, grown in a photoassisted microwave plasma (PMP) metalorganic chemical vapor deposition (MOCVD) reator, are self-assembled in layers to achieve anjection or high-field electroluminescent (EL) display devices. This technology, which has been under development for over four years to realize blue-green quantum dot lasers at the university of Connecticut, is being adapted under the sponsor ship of BMDO's SBIR program for the purpose of developing efficient, high brightness, and reliable long lifetime displays. The proposed program combines the technology of cladded quantum-dot growth with novel site-specific self-assembly technique to produce full color displays which are superior to current cometing technologies including ZnS phosphors based thin film devices, field emission displays (FEDs), and matured back-lighted, color-filtered active liquid crystal displays. This presents a significant immprovement in terms of: -Brighter [100-1,000 Cd/m^2 versus 50 Cd/m^2 for the present bulk ZnS:(doped with Cu^+ or Mn^2+) EL products] along with faster response time (~lns versus 100 micro-second-1ms); -Lower operatintvoltage (8-10 Volt versus 60-250 Volt) and higher conversion efficiency; -Ease of manufacturing integrated full color displays as a result of site-specific deposition of varios color-emitting nanophosphors; -Enhanced reliability (c.a. 10,000 versus 3,000 hours for bulk phosphor).