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Quantum dots (QDs) have gained extensive attention owing to their outstanding photoelectric properties. However, the fast and continuous synthesis of QDs remains a challenge. Herein, for the first time, we develop a magnetothermal microfluidic technique (MMT) to rapidly synthesize CdSe and CdSe@ZnS QDs with higher optical performance and continuous production. The as-prepared CdSe@ZnS QDs exhibit relatively high photoluminescence quantum yields (PL QYs) (∼70%). Meanwhile, by manipulating the fluid rate and reaction temperature of the MMT, the emission wavelengths can be tuned in the visible region from 515 to 625 nm. Furthermore, the red emissive CdSe@ZnS QDs are used as fluorescent conversion materials in a backlight display, which shows a wide color gamut around 112%. Our purpose is to highlight a new powerful platform of the MMT for rapid, accurate, and continuous fabrication of photoluminescent nanomaterials, which will guide the substantial progress of backlight displays and light emitting diodes (LEDs). [ABSTRACT FROM AUTHOR]