Self-organized micro-light-emitting diode structure for high-speed solar-blind optical wireless communications
Self-organized micro-light-emitting diode structure for high-speed solar-blind optical wireless communications
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DOI：
10.1063/5.0013112
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发表时间：
2020-07
影响因子：
4
通讯作者：
K. Kojima;Y. Yoshida;M. Shiraiwa;Y. Awaji;A. Kanno;N. Yamamoto;A. Hirano;Y. Nagasawa;M. Ippommatsu;S. Chichibu
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文献类型：
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作者：
K. Kojima;Y. Yoshida;M. Shiraiwa;Y. Awaji;A. Kanno;N. Yamamoto;A. Hirano;Y. Nagasawa;M. Ippommatsu;S. Chichibu
采用时间分辨电致发光（EL）和显微成像实验研究了AlN/蓝宝石模板上生长的深紫外（DUV）AlGaN发光二极管（LED）的快调制特性。LED最近在室内照明和直射阳光下展示了Gbps级光无线通信（OWC）。LED的频率响应（f3 dB）达到了184 MHz，考虑到LED的尺寸，这远远超出了预期。由于EL实验观察到具有低电容（C）的自组织微LED结构，因此解释了AlGaN LED的高效率和快速调制性质的兼容性。我们的方法可以克服的困境，其中微发光二极管可以快速调制，但具有低功耗，因此，自组织的微发光二极管结构是一个理想的解决方案，以实现实用的深紫外光波导。
The origin of the fast modulation characteristics of deep ultraviolet (DUV) AlGaN light-emitting diodes (LEDs) grown on AlN/sapphire templates with vicinal off-angles is reported by employing time-resolved electroluminescence (EL) and micro-imaging experiments. The LEDs have recently demonstrated Gbps-class optical wireless communication (OWC) under both room-lighting and direct-sun. The frequency response (f3dB) of the LED reached 184 MHz, which is far beyond expectations by considering the size of the LEDs. Since self-organized micro-LED structures with a low electric capacitance (C) are observed by the EL experiments, the compatibility of high efficiency and fast modulation nature of the AlGaN LEDs is explained. Our approach can overcome the dilemma, where micro-LEDs can be modulated fast but have low power, and therefore, the self-organized micro-LED structure is an ideal solution to realize practical DUV OWCs.