Electrically driven, phosphor-free, white light-emitting diodes using gallium nitride-based double concentric truncated pyramid structures

• 来源期刊: 光：科学与应用（英文版）
• 关键词: indium gallium nitride light-emitting diodes phosphor-free three-dimensional structures white color
• 年，卷（期）: 2016,（1）
• 页码范围: 123-128
• 页数: 6页
• 语种: 中文
• DOI: 10.1038/lsa.2016.30

摘要

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.Here,we demonstrate electrically driven,phosphor-free,white LEDs based on three-dimensional gallium nitride structures with double concentric truncated hexagonal pyramids.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.