可见光通信（VLC）技术巧妙地融合了通信和照明或显示功能，为通信提供了高效便捷的方案。有机电致发光器件（OLED）作为最接近自然阳光的人造光源，在可见光通信系统的发射端展现出巨大的应用潜力。然而，受制于有机发光染料激子辐射复合速率较慢的限制，OLED在高频信号激励时响应速度较慢。为了克服这一限制，我们提出利用微腔结构，旨在通过微腔效应增强有机发光分子的自发辐射速率，从而改善器件的频率响应。研究结果表明，特定腔长的光学微腔引发的Purcell效应能够提升特定波长的光子态密度，从而加速其自发辐射速率。这种增强效应成功地将调制带宽从4 kHz提高到7 kHz，拓展了近75%的响应频率范围。

随着AlGaN基深紫外发光二极管(DUV LED)的发展，其不仅在杀菌消毒领域得到广泛应用，在日盲紫外光通信领域的应用也受到越来越多的关注。这主要是由于相比其他的紫外光源（如汞灯、激光），其具有功耗低、设计灵活且调制带宽高的优势。而DUV LED的带宽严重依赖于器件尺寸，器件尺寸越小，其带宽越高。但是，随着深紫外微型发光二极管(μLED)的尺寸减少，尽管其带宽得到提高，但是其光功率却急剧下降，这严重限制了深紫外μLED在光通信中的应用。文中主要总结了深紫外μLED作为日盲紫外光通信光源的研究现状和综合分析尺寸效应引起器件性能的变化及其机理；并分析出低的光提取效率和严重的自热效应是影响深紫外μLED光功率的两个主要因素。进而综述了各种提高深紫外μLED光提取效率和改善热学特性的方法。文中将为从事深紫外μLED研究的工作者提供一定的研究方向指导。

针对传统选择性区域生长叠层双有源区电吸收调制激光器（SAG-DSAL-EML）在高频调制环境下的响应速度问题以及改善其远场发散角特性，文章提出利用掺铁掩埋技术对电吸收调制激光器（EML）结构进行优化，设计了InGaAsP/InP材料1 310 nm掺铁掩埋结构的SAG-DSAL-EML并制作样本芯片，新型SAG-DSAL-EML有源区变为台面结构，并在其两层外延生长掺铁InP层。同时，利用先进激光二极管模拟器（ALDS）软件和高频结构仿真（HFSS）软件对所设计掺铁掩埋结构的EML和调制器进行数值及仿真分析，结果表明，与传统多量子阱结构相比，SAG-DSAL-EML阈值电流减少了13%；与传统脊波导结构相比，掺铁掩埋结构的侧向限制能力提高52%，激光远场横纵角度之差降低了40%，具有更小的远场发散角；与传统PNPN掩埋结构相比，掺铁掩埋结构的调制器在－3 dB的响应带宽提高了约24%。对样本芯片进行测试，试验表明，SAG-DSAL-EML的阈值电流为14.5 mA，边模抑制比（SMSR）为45.64 dB，70 mA注入电流下，电吸收调制器－3 dB的响应带宽为43 GHz，满足高速激光通信的基本要求。

The evolution of next-generation cellular networks is aimed at creating faster, more reliable solutions. Both the next-generation 6G network and the metaverse require high transmission speeds. Visible light communication (VLC) is deemed an important ancillary technology to wireless communication. It has shown potential for a wide range of applications in next-generation communication. Micro light-emitting diodes (μLEDs) are ideal light sources for high-speed VLC, owing to their high modulation bandwidths. In this review, an overview of μLEDs for VLC is presented. Methods to improve the modulation bandwidth are discussed in terms of epitaxy optimization, crystal orientation, and active region structure. Moreover, electroluminescent white LEDs, photoluminescent white LEDs based on phosphor or quantum-dot color conversion, and μLED-based detectors for VLC are introduced. Finally, the latest high-speed VLC applications and the application prospects of VLC in 6G are introduced, including underwater VLC and artificial intelligence-based VLC systems.The evolution of next-generation cellular networks is aimed at creating faster, more reliable solutions. Both the next-generation 6G network and the metaverse require high transmission speeds. Visible light communication (VLC) is deemed an important ancillary technology to wireless communication. It has shown potential for a wide range of applications in next-generation communication. Micro light-emitting diodes (μLEDs) are ideal light sources for high-speed VLC, owing to their high modulation bandwidths. In this review, an overview of μLEDs for VLC is presented. Methods to improve the modulation bandwidth are discussed in terms of epitaxy optimization, crystal orientation, and active region structure. Moreover, electroluminescent white LEDs, photoluminescent white LEDs based on phosphor or quantum-dot color conversion, and μLED-based detectors for VLC are introduced. Finally, the latest high-speed VLC applications and the application prospects of VLC in 6G are introduced, including underwater VLC and artificial intelligence-based VLC systems.