Fabrication and characterization of Three-dimensional nitride semiconductor structures for phosphor-free white light emitting devices = 무형광체 백색 발광 소자를 위한 삼차원 질화물 반도체 구조의 제작 및 특성 분석

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White light-emitting diodes (LEDs) are becoming an alternative general light source, with huge energy savings compared to conventional lighting. However, white LEDs using phosphor(s) suffer from unavoidable Stokes energy converting losses, higher manufacturing cost, and reduced thermal stability. In this dissertation, we demonstrate electrically driven, phosphor-free, white LEDs based on three-dimensional gallium nitride structures with double concentric truncated hexagonal pyramids. Selective area growth using hole, ring and complex mask is systematically studied and we intentionally design patterns that emit white color. The electroluminescence spectra are stable with varying current. The origin of the emission wavelength is studied by cathodoluminescence and high-angle annular dark field scanning transmission electron microscopy experiments. Spatial variation of the carrier injection efficiency is also investigated by a comparative analysis between spatially resolved photoluminescence and electroluminescence. We believe that our results will open a new approach for the fabrication of phosphor-free white LEDs. We also believe that our spatially resolved photoluminescence and electroluminescence data will facilitate the design and engineering of three dimensional structure LEDs.
Advisors
Cho, Yong-Hoonresearcher조용훈researcher
Description
한국과학기술원 :물리학과,
Publisher
한국과학기술원
Issue Date
2017
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 물리학과, 2017.2,[v, 41 p. :]

Keywords

indium gallium nitride; light-emitting diodes; phosphor-free; three-dimensional structures; white color; 질화물반도체; 발광다이오드; 무형광체; 삼차원구조체; 백색

URI
http://hdl.handle.net/10203/241777
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=675684&flag=dissertation
Appears in Collection
PH-Theses_Ph.D.(박사논문)
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