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。

Despite the rapid advances of red and green perovskite light-emitting diodes (PeLEDs), achieving high brightness with high external quantum efficiency (EQE) remains a challenge for the pure-blue PeLEDs, which greatly hinders their practical applications, such as white-light illumination and in optical communication as a high-speed and low-loss light source. Herein, we report a high-performance pure-blue PeLED based on mixed-halide quasi-2D perovskites incorporated with a zwitterionic molecule of 3-(benzyldimethylammonio) propanesulfonate (3-BAS). Experimental and density functional theory analysis reveals that 3-BAS can simultaneously eliminate non-radiative recombination loss, suppress halide migration, and regulate phase distribution for smoothing energy transfer in the mixed-halide quasi-2D perovskites, leading to the final perovskites with high photoluminescence quantum yield and robust spectrum stability. Thus, the high-performance pure-blue PeLED with a recorded brightness with 1806 cd m ^{- 2} and a relative higher EQE of 9.25% is achieved, which is successfully demonstrated in a visible light communication system for voice signal transmission. We pave the way for achieving highly efficient pure-blue PeLEDs with great application potential in future optical communication networks.

In this Letter, we propose and experimentally demonstrate a lens-free wavefront shaping method that utilizes synchronized signal block beam alignment and a genetic algorithm (SSBGA) for a diffuse non-line-of-sight (NLOS) visible light communication (VLC) system. The proposed method effectively controls the position and mobility of visible light beams by partitioning spatial light modulator pixels and manipulating beams to converge at distinct spatial positions, thereby enhancing wavefront shaping efficiency, which achieves a significant 23.9 dB optical power enhancement at +2mm offset, surpassing the lens-based continuous sequence (CS) scheme by 21.7 dB. At +40° angle, the improvement reaches up to 11.8 dB and 16.8 dB compared to the results with and without lens-based CS, respectively. A maximum rate of 5.16 Gbps is successfully achieved using bit-power loading discrete multi-tone (DMT) modulation and the proposed SSBGA in an NLOS VLC system, which outperforms the lens-based CS by 1.07 Gbps and obtains a power saving of 55.6% during the transmission at 4 Gbps. To the best of our knowledge, this is the first time that high-speed communication has been realized in an NLOS VLC system without a lens.

以发光二极管(LED)为发射端的水下可见光通信(UVLC)系统因器件带宽所限其传输速率较低，且受水质环境影响较大，致使通信综合性能不佳。为提高信道容量与通信质量，将信道复用技术应用在LED-UVLC系统中，以现场可编程门阵列(FPGA)为数据处理核心，搭建LED蓝绿光发射阵列以及雪崩光电二极管(APD)接收阵列，设计出了一个4×4的多信道UVLC系统。我们将系统置于长20 m的水下环境中，以26.7 Mbit/s的通信速率，完成了误码率(BER)约为10^?7的双向传输。实验数据表明，当传输不同大小的数据文件时，对比传统的单输入单输出水下可见光通信(SISO-UVLC)系统，节省了约4倍的通信时间，且与仿真的信道容量增益一致。另外，在水质和通信距离相同的条件下，本系统能获得更优的BER性能。

提出了一种解决无人机（Unmanned aerial vehicle，UAV）在可见光通信（Visible?light communication， VLC）中光源定位不准确的方法，该方法基于扩大及规律缩小搜索路径的方法，最终找到光源以及最佳通信位置。为了提高本方法的搜索成功率（η），本文针对通信光源的光分布对η、搜索总路程的影响，以及光电探测器的探测位置、探测接收角对接收光功率、η的影响作出了分析。得到了在满足UAV探测功率阈值的条件下，光源提供的三维覆盖范围随光源朗伯系数的变化情况，可用于预估UAV在不同发光条件下的η。以等边六边形搜索路径为例，在理想朗伯体条件下，UAV在光源覆盖半径最大为0.78 m时，η最高可高达0.74。本方法理论上避免了UAV定位不准确导致的无法实现可见光通信的问题，并提出通过优化搜索路径和光源的出光设计提高光源搜索成功率的方案，为UAV可见光通信的实现提出了解决方案。