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.

为提升光学镜头的成像质量，消除杂散光的影响，以K9玻璃为基底设计可见光波段平均反射率小于0.1%的减反射膜。采用电子束离子辅助沉积的制备方式，针对薄层敏感度高、光谱变化大等问题，通过建立稳定控制膜层厚度的数学模型来减小膜厚误差，提高制备精度和成膜稳定性。对减反射膜进行环测实验，优化调整工艺参数，侧重提高减反射膜的硬度和耐水煮能力。实验结果表明，最终制备出的减反射膜在420~680 nm波段内的平均反射率约为0.044%，最高反射率为0.071 2%，克服了以MgF₂为外层的减反射膜机械性能和化学稳定性较差的问题，满足工程应用低损耗、稳定可靠、高强度、可重复性制备的要求。