Huang Dapeng, Xie Ying, Lu Dazhi, Wang Zeyan, Wang Jiyang, Yu Haohai, Zhang Huaijin
State Key Laboratory of Crystal Materials and Institute of Crystal Materials, Shandong University, Jinan, 250100, China.
Adv Mater. 2019 Jun;31(24):e1901117. doi: 10.1002/adma.201901117. Epub 2019 Apr 29.
Multicolor photoluminescence over the full visible color spectrum is critical in many modern science and techniques, such as full-color lighting, displays, biological and chemical monitoring, multiband communication, etc., but the ultimate white lasing especially on the nanoscale is still a challenge due to its exacting requirements in the balance of the gain and optical feedback at different wavelengths. Recently, 2D transition metal carbides (MXenes) have emerged, with some superior chemical, physical, and environmental properties distinguishing them from traditional 2D materials. Here, a white laser with V C MXene quantum dots (MQDs) is originally demonstrated by constructing a broadband nonlinear random scattering system with enhanced gain. The excitation-dependent photoluminescence of V C MQDs is enhanced by passivation and characterized, and their localized nonlinear random scattering is realized by the generation of excitation-power-dependent solvent bubbles. With the optimized excitation, the blue, green, yellow, and red light is amplified and simultaneously lased. This work not only provides a kind of promising material for white lasers, but also a design strategy of novel photonics for further applications.
全可见光谱范围内的多色光致发光在许多现代科学技术中至关重要，如全彩照明、显示器、生物和化学监测、多波段通信等，但由于在不同波长下增益和光反馈平衡方面的严格要求，尤其是在纳米尺度上实现终极白色激光仍然是一个挑战。最近，二维过渡金属碳化物（MXenes）应运而生，其一些卓越的化学、物理和环境特性使其有别于传统二维材料。在此，通过构建具有增强增益的宽带非线性随机散射系统，首次展示了基于V C MXene量子点（MQDs）的白色激光。通过钝化增强并表征了V C MQDs的激发依赖光致发光，通过产生激发功率依赖的溶剂气泡实现了其局部非线性随机散射。经过优化激发，蓝色、绿色、黄色和红色光被放大并同时产生激光。这项工作不仅为白色激光提供了一种有前景的材料，也为进一步应用提供了一种新型光子学的设计策略。
