An organic-inorganic hybrid KTiF : Mn red-emitting phosphor with remarkable improvement of emission and luminescent thermal stability.

A new type of monoethanolamine (MEA) and Mn co-doped KTF : MEAH, Mn (KTiF : 0.1MEAH, 0.06Mn) red emitting phosphor was synthesized by an ion exchange method. The prepared Mn co-doped organic-inorganic hybrid red phosphor exhibits sharp red emission at 632 nm and the emission intensity at room temperature is 1.43 times that of a non-hybrid control sample KTF : Mn (KTiF : 0.06Mn). It exhibits good luminescent thermal stability at high temperatures, and the maximum integrated PL intensity at 150 °C is 2.34 times that of the initial value at 30 °C. By coating a mixture of KTF : MEAH, Mn, a yellow phosphor (YAG : Ce) and epoxy resin on a blue InGaN chip, a prototype WLED (white light-emitting diode) with CCT = 3740 K and = 90.7 is assembled. The good performance of the WLED shows that KTF : MEAH, Mn can provide a new choice for the synthesis of new Mn doped fluoride phosphors.