Highly efficient and thermally stable MnII-based phosphor-in-glass towards warm WLED

Aluminate with the magnetoplumbite-type (LaZnAl11O19) represents a big family technology important compound. Crystallographic sites for transition metal and rare earth ion in the magnetoplumbite structure have always been a hot topic. Here, manganese-based magnetoplumbite-type La(Zn,Mn)Al11O19 phosphors were successfully synthesized via the traditional solid-state reaction and all the samples crystallized into the hexagonal structure. A narrow green emission band at approximately 518 nm with quantum efficiency (-unit one) is demonstrated in LaZnAl11O19 host with Mn2+ doping equal 0.3. Temperature dependent photo-luminescence indicate that LaZn0.7Mn0.3Al11O19 sample keep excellent thermal stability. Meanwhile, the thermal ionization process was elaborated in detail. At last, a high-power w-LED with a high color rendering index and low associated color temperature is produced by inserting the microcrystals into the glass host using a "phosphor-in-glass (PiG)" technique.