Thermal and optical investigations of self-loop system based on liquid quantum dots for laser lighting

•A self-loop converter was designed to solve the thermal quenching problem of QDs.•QDs could maintain stable lighting for 240 min under the high-power laser.•Temperature fluctuation of QDs was significantly reduced. This study proposes a self-loop converter (SLC) based on liquid quantum dots (QDs) that is designed for laser lighting. QDs exhibit unique illumination and display advantages because of their high light conversion efficiency and color purity. However, the unavoidable heat generated during light conversion leads to thermal quenching and limits their application in high-power laser lighting. The proposed SLC reduces the temperature and temperature fluctuations in the excited heating and gas circulation areas. After excited by laser for 240 min, the radiation power only decreases from 529.65 mW to 464.13 mW, a decrease of 12.37%. But the radiation power of hermitic converter (HC) decreased from 520.52 mW to 361.35 mW, decreasing by 30.5% after excited by laser for the same time. The experimental results demonstrate that the proposed SLC is promising for laser headlights, aerospace, coal mining, and other fields.