论文标题
来自核心壳/gan纳米棒的最先进的红色辐射前景和前景
State-of-the-art and prospects for intense red radiation from core-shell InGaN/GaN nanorods
论文作者
论文摘要
带有INGAN/GAN量子井（QWS）的核心壳纳米棒（NRS）对于单层发光二极管和多色显示器有望。但是，这种应用仍然是一个挑战，因为与蓝色和绿色相比，红色带的强度太弱了。为了澄清问题，我们执行了功率和温度依赖性，以及含量和直径不同的NRS中光致发光（PL）的时间分辨测量。这些研究表明，主要的PL带源于非极性和半极性QW，而宽的黄红色带主要来自GAN核心中的缺陷。 NR尖端处的极性QW的红色发射强度是致命的。我们对NRS内电磁场分布的计算显示，尖端中光子状态的低密度抑制了红色辐射。我们建议一种混合NRS的设计，其中，位于GAN芯内部的极性QW通过非极性QW的UV蓝色辐射泵送。讨论了通过percell效应提高辐射重组率的可能性。
Core-shell nanorods (NRs) with InGaN/GaN quantum wells (QWs) are promising for monolithic white light-emitting diodes and multicolor displays. Such applications, however, are still a challenge because intensity of red band is too weak as compared with blue and green ones. To clarify the problem, we have performed power and temperature dependent, as well as time-resolved measurements of photoluminescence (PL) in NRs of different In content and diameter. These studies have shown that the dominant PL bands originate from nonpolar and semipolar QWs, while a broad yellow-red band arises mostly from defects in the GaN core. Intensity of red emission from the polar QWs at the NR tip is fatally small. Our calculation of electromagnetic field distribution inside the NRs shows a low density of photon states in the tip that suppresses the red radiation. We suggest a design of hybrid NRs, in which polar QWs, located inside the GaN core, are pumped by UV-blue radiation of nonpolar QWs. Possibilities of radiative recombination rate enhancement by means of the Purcell effect are discussed.
