Colloidal quantum dots (QDs) are an attractive light source for visible photonics, in particular their widely tunable emission wavelength, inexpensive wet-chemical synthesis and straight-forward hybrid integration can make the difference. In this work, integrated light-emitting diodes are demonstrated based on CdSe/CdS QDs, with the emission directly coupled to a silicon nitride waveguide. The devices feature a record current density of up to 100 A cm⁻² and a maximum on-chip power density of almost 1.5 W cm⁻² in a single-mode waveguide. Operated as detectors, the photodiodes have a low dark current of 1.5 µA cm⁻². It is anticipated, that the devices will find an application in chip-based absorption spectroscopy and bio-sensing, as they can be post-processed on foundry-fabricated waveguide platforms, at a low cost. In addition, this approach provides the missing low-loss waveguide layer, necessary for building an electrically pumped laser using colloidal QDs.

中文翻译：

---

氮化硅平台上的波导耦合胶体量子点发光二极管和探测器

胶体量子点 (QD) 是可见光子学的一种有吸引力的光源，特别是它们广泛可调的发射波长、廉价的湿化学合成和直接的混合集成可以发挥作用。在这项工作中，基于 CdSe/CdS QD 展示了集成发光二极管，其发射直接耦合到氮化硅波导。这些器件在单模波导中具有高达 100 A cm ^-2的创纪录电流密度和近 1.5 W cm ^-2的最大片上功率密度。作为检测器，光电二极管具有 1.5 µA cm ^-2的低暗电流. 预计这些设备将在基于芯片的吸收光谱和生物传感中得到应用，因​​为它们可以在代工制造的波导平台上以低成本进行后处理。此外，这种方法提供了缺失的低损耗波导层，这是使用胶体 QD 构建电泵浦激光器所必需的。