White light sources based on laser diodes are considered to be the next-generation light sources owing to their high luminous efficiency, high luminous flux, and excellent directivity. Quantum dots (QDs) are new fluorescent materials that have been widely used in lighting and displays. However, when used for high-power illumination, QDs excitation and emission are accompanied by obvious attenuation problems owing to their reabsorption effect and low stability in high temperature environment. To solve these problems, this study proposes three types of QD-based self-loop systems for laser illumination and analyzes their thermal and optical properties. White light is obtained by exciting red and green QDs using a blue laser. The three types of self-loop converters are green-QD-front type (structure I), red-QD-front type (structure II), and hybrid type (structure III). The average temperatures of the excitation region of structures I and II were maintained at approximately 37.3 °C and 37.0 °C, respectively, which were both lower than that of the hybrid structure (46.7 °C). The radiation flux of structure I only attenuated by 15.6% after laser irradiation for 120 min. Furthermore, the shift in color coordinates was the smallest. When the laser driving current was changed from 500 mA to 1500 mA, the correlated color temperature (CCT) drift was only 474 K. We believe that these results will provide guidelines for QD-based laser-driven illumination.

基于激光二极管的白光源由于其高发光效率、高光通量和优异的指向性而被认为是下一代光源。量子点 (QD) 是一种新型荧光材料，已广泛应用于照明和显示器。然而，当用于大功率照明时，QDs的激发和发射由于其重吸收效应和高温环境下的低稳定性而伴随着明显的衰减问题。为了解决这些问题，本研究提出了三种基于量子点的激光照明自环系统，并分析了它们的热学和光学特性。白光是通过使用蓝色激光激发红色和绿色 QD 获得的。三种类型的自环转换器是green-QD-front type（结构I），red-QD-front type（结构II），和混合型（结构 III）。结构 I 和 II 的激发区域的平均温度分别保持在约 37.3 °C 和 37.0 °C，均低于混合结构 (46.7 °C)。结构I的辐射通量在激光照射120 min后仅衰减15.6%。此外，颜色坐标的变化最小。当激光驱动电流从 500 mA 变为 1500 mA 时，相关色温 (CCT) 漂移仅为 474 K。我们相信这些结果将为基于 QD 的激光驱动照明提供指导。结构I的辐射通量在激光照射120 min后仅衰减15.6%。此外，颜色坐标的变化最小。当激光驱动电流从 500 mA 变为 1500 mA 时，相关色温 (CCT) 漂移仅为 474 K。我们相信这些结果将为基于 QD 的激光驱动照明提供指导。结构I的辐射通量在激光照射120 min后仅衰减15.6%。此外，颜色坐标的变化最小。当激光驱动电流从 500 mA 变为 1500 mA 时，相关色温 (CCT) 漂移仅为 474 K。我们相信这些结果将为基于 QD 的激光驱动照明提供指导。