Phosphor-Free Solid State Light Sources

Nause, Jeff E ; Ferguson, Ian ; Doolittle, Alan

Cermet Inc

关键词: Molecular Beam Epitaxy;    Light Sources;    Wavelengths;    Epitaxy;    36 Materials Science;   

DOI  :  10.2172/923031
RP-ID  :  None
RP-ID  :  FC26-03NT41942
RP-ID  :  923031

美国|英语

来源: UNT Digital Library

【 摘 要 】

The objective of this work was to demonstrate a light emitting diode that emitted white light without the aid of a phosphor. The device was based on the combination of a nitride LED and a fluorescing ZnO substrate. The early portion of the work focused on the growth of ZnO in undoped and doped form. The doped ZnO was successfully engineered to emit light at specific wavelengths by incorporating various dopants into the crystalline lattice. Thereafter, the focus of the work shifted to the epitaxial growth of nitride structures on ZnO. Initially, the epitaxy was accomplished with molecular beam epitaxy (MBE). Later in the program, metallorganic chemical vapor deposition (MOCVD) was successfully used to grow nitrides on ZnO. By combining the characteristics of the doped ZnO substrate with epitaxially grown nitride LED structures, a phosphor-free white light emitting diode was successfully demonstrated and characterized.