2007 Fiscal Year Final Research Report Summary
Development of deep UV light emitting devices using nano-technology and the application
| Project/Area Number |
15GS0207
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| Research Category |
Grant-in-Aid for Creative Scientific Research
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| Allocation Type | Single-year Grants |
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| Research Institution | Ritsumeikan University (2007)
Tokyo Institute of Technology (2003-2006) |
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Principal Investigator |
AOYAGI Yoshinobu Ritsumeikan University, Center for Promotion of the COE Program, Professor (70087469)
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| Co-Investigator(Kenkyū-buntansha) |
TAKEUCHI Misaichi Riken Institute, Nano-science Research Program, Researcher (60284585)
INOUE Shinnichiro Kyushu University, Institute of Materials Chemistry and Engineering, Assistant Professor (20391865)
HIRAYAMA Hideki Riken Institute, Tera-Hertz Quantum Device Group, Team Leader (70270593)
MATSUMOTO Yuji Tokyo Institute of Technology, Interdisciplinary Graduate School of Science and Engineering, Associate Professor (60302981)
KOINUMA Hideomi The University of Tokyo, Graduate School of Frontier Science, Professor (70011187)
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| Project Period (FY) |
2003 – 2007
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| Keywords | deep UV LED / two light beam in-situ monitoring system / vertical type Deep UV LED / hetero nonlinear photonic crystal / anti-surfactant method / flax crystal growth technique / boron oxide material / temperature modulation technique |
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| Research Abstract |
In this project we have proposed several new technologies on development of solid state high power deep UV (DUV) light emitting devices (LEDs), which could essentially solve a lot of environmental problems concerned by many people nowadays, and have proven the real possibility of our proposal toward the high power DUV light emitting devices. Epitaxial crystal growth procedures have fundamentally been clarified by some scientific approaches. Highly-doping technologies for p-type widegap semiconductors and highly-efficient nonlinear photonic crystals have been developed. Our results are as follows:
1.Epitaxial growth mechanism of A1GaN-based materials and hetero structures has scientifically been revealed by a newly developed in-situ monitoring system instead of previous experiential approach.
2.Development of vertical-type DUV LEDs emitting at 280 nm has been succeeded, which promise future high-power operation.
3.InAlGaN quantum dot DUV LEDs have firstly been operated at 355nm.
4.Extremely enhanced SHG has been generated by newly developed hetero nonlinear photonic crystals. The efficiency was more than 300 times compared with balk nonlinear materials. DUV laser was operated at 325 nm by this technology.
5.Epitaxial growth of new nonlinear-photonic-crystal thin films (RECa4O(BO3)3RECOB) has been succeeded by flax crystal growth technique.
6.P-type doping of ZnO materials has been accomplished by introducing growth temperature modulation with combinatorial technique.
These results are published in about 50 original papers and presented in international conference of more than 65 including 8 invited papers. About 75 papers are presented in domestic conference. Patents obtained or required are 13. Typical examples for each are listed in following sheets
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