Red phosphors SrIn2O4:Eu3+, Y3+ and SrYInO4:Eu3+ for WLEDs with high thermal stability and strong luminescence

Rare earth ion-doped perovskite oxide phosphors are crucial for white light-emitting diode devices. In this study, high-performance red phosphors SrIn 1.95- x O 4 :0.05Eu 3+ , x Y 3+ (SIO:0.05Eu 3+ , x Y 3+ , 0 ≤ x ≤ 0.3) and SrY 1- x InO 4 : x Eu 3+ (SYIO: x Eu 3+ , 0 ≤ x ≤ 0.3) were synthesized using high-temperature solid-phase method. The energy bandgap of the new host material, SrYInO 4 is larger than that of SrIn 2 O 4 . The synthesized series of red phosphors exhibit good crystallinity and electronic structure. Under 308 nm excitation, SIO:0.05Eu 3+ ,0.1Y 3+ and SYIO:0.2Eu 3+ show the highest luminescence intensity within their respective series, emitting red light at around 616 nm. Their luminescence intensity is 2.2 times and 4 times higher than the previously reported SrIn 1.95 O 4 :0.05Eu 3+ red phosphors, respectively. Additionally, SIO:0.05Eu 3+ ,0.1Y 3+ , and SYIO:0.2Eu 3+ display high color purity (87.1 % and 96.5 %, respectively), microsecond level fluorescence lifetime and excellent thermal stability. SIO:0.05Eu 3+ ,0.1Y 3+ , and SYIO:0.2Eu 3+ show significant potential for application as red-emitting components in WLED devices.