Tin fluorophosphate (TFP) glass, which can be used to manufacture a phosphor-in-glass (PiG) for achieving high-power white light-emitting diodes (w-LEDs), has attracted a great deal of attention because of its low-melting point. Mn2+-doped ultralow glass transition temperature (similar to 122 degrees C) Sn-F-P-O glasses were prepared to achieve broadband visible light emission from 390 to 720nm. By controlling the concentration of MnO, the emission color of the TFP glass can be adjusted from blue/cool white to warm white/red. In particular, 0.2 mol% MnO-doped TFP glass, which yields bright and warm white light and has ultralow glass transition temperature and thermal stability, has a promising application prospect in the field of high-power w-LEDs.