Fluorescence property of ZrO2:Ti phosphor and its enhancement in fluorescent intensity by adding phosphorus

It was investigated how the PL of the blue phosphor, ZrO2:Ti, was affected by the change in addition amounts of Ti. The 1000 ppm Ti doped ZrO2, (ZrO2 + 1000 ppm Ti), showed the strongest PL, which was 5.4 times higher than that of the pure ZrO2. This strong PL was further improved by the addition of P, Sn, Se, B and Si to the (ZrO2 + 1000 ppm Ti) phosphor. The improvement was achieved by the (ZrO2 + 1000 ppm Ti + 4000 ppm P) phosphor, and its absorptivity, internal quantum efficiency and external quantum efficiency were 53, 59 and 31% at room temperature, respectively, when excited at 280 nm.