Luminescence properties and energy transfer of novel Bi3+and Mn2+-co-activated Y3Ga5O12single-component white light-emitting phosphor

A series of novel Y3Ga5O12:Bi3+,Mn(2+)phosphors with controllable luminescence have been synthesized and their photoluminescence characteristics have been studied in detail with the purpose of developing a single-component white light-emitting phosphor suitable for pc-WLEDs. The Bi(3+)singly-doped phosphor shows an intense blue-green emission, while the Mn2+-doped phosphor presents a narrow red emission with a FWHM of 59 nm, which is comparable to the previously reported nitride red phosphor Ca[LiAl3N4]:Eu2+. When Bi(3+)and Mn(2+)were co-doped into the Y(3)Ga(5)O(12)matrix, effective energy transfer from the Bi(3+)to Mn(2+)ions was observed. Subsequently, a single-component warm white light-emitting phosphor was obtained by adjusting the doping ratio of Bi(3+)and Mn(2+)and by utilizing the energy transfer from the Bi(3+)to Mn(2+)ions. Moreover, the thermal quenching properties show that the prepared Y3Ga5O12:Bi3+,Mn(2+)samples possess good thermal stability of luminescence. Finally, a WLED device with a highR(a)of 90, a low CCT of 3908 K, and a CIE color coordinate of (0.3503, 0.3158) has been fabricated using the synthesized phosphor. The results indicate that Y3Ga5O12:Bi3+,Mn(2+)phosphors are potential candidates as single-component white light emission phosphors applied in WLEDs. Moreover, this strategy is also conducive for the design of novel white light emission phosphors for pc-WLEDs.