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

机译:电气驱动的无磷白色发光二极管采用基于氮化镓的双同心截头金字塔结构

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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.
机译:白光发光二极管(LED)正在成为一种替代的通用光源,与传统照明相比节省了巨大的能源。然而,使用磷光体的白光LED不可避免地遭受了斯托克斯能量转换损失,较高的制造成本以及降低的热稳定性。在这里,我们演示了基于电驱动的无磷白光LED,该LED基于具有双同心圆角截断的六棱锥的三维氮化镓结构。电致发光光谱在变化的电流下是稳定的。通过阴极发光和高角度环形暗场扫描透射电子显微镜实验研究了发射波长的起源。还通过在空间分辨的光致发光和电致发光之间的比较分析来研究载流子注入效率的空间变化。

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