Large Negative-Thermal-Quenching Effect in Phonon-Induced Light Emissions in Mn-Activated Fluoride Phosphor for Warm-White Light-Emitting Diodes.

Currently, hunting for anti-temperature-degradation high-efficiency phosphors has become crucially significant for fabricating high-brightness phosphor-converted white light-emitting diodes (pc-WLEDs). Herein, we show that photoluminescence in a kind of full-solution-processed KSiF:Mn red phosphor exhibits an extraordinarily large negative thermal quenching property. For instance, under the excitation of 477 nm laser light, the sample photoluminescence intensity amazingly increases by 347-fold when the temperature is increased from 4 to 477 K. The temperature-driven transition probability enhancement of the phonon-induced luminescence around Mn ions in the phosphor is argued to be responsible for the large negative-thermal-quenching phenomenon. We also demonstrate a pc-WLED with of 82 and correlated color temperature of 2701 K by using the KSiF:Mn red phosphor + commercial yellow phosphor of YAG:Ce.