Highly efficient blue-green dual-narrow-emission in RbAlO:Eu,Mn toward wide-color-gamut human-centric backlights

A combination of violet light-emitting diode (LED) chips and trichromatic highly efficient narrow-band emission phosphors to create color images can help to effectively address sleep and mood disorders caused by strong blue LED radiation, and is in line with the development of "human-centric" backlight displays. In this work, RbAl 11 O 17 :Eu 2+ exhibits narrow-band (full width at half maximum = 50 nm), thermally stable (150 °C, 86.96%), and highly efficient blue emission (62.87%) under violet excitation. Rb 0.80 Al 11 O 17 :Eu 2+ offers higher color purity than BaMgAl 10 O 17 :Eu 2+ and is an alternative to blue chips. RbAl 10.70 O 17 :0.30Mn 2+ exhibits narrow green emission (full width at half maximum = 26 nm) and low luminescence efficiency (∼2.91%). An efficient energy transfer of Eu 2+ → Mn 2+ in the RbAl 11 O 17 :Eu 2+ ,Mn 2+ system is designed for the spectral transition from blue emission to blue-green dual emission. The luminescence efficiencies of Rb 0.80 Al 10.95 O 17 :0.20Eu 2+ ,0.05Mn 2+ and Rb 0.80 Al 10.80 O 17 :0.20Eu 2+ ,0.20Mn 2+ can reach more than 60%. The good color gamut (118% National Television Standards Committee) of white LEDs encapsulated with a combination of Rb 0.80 Al 10.95 O 17 :0.20Eu 2+ ,0.05Mn 2+ , K 2 SiF 6 :Mn 4+ phosphors and a violet chip justifies their potential application in human-centric backlit displays. The guidance on the modulation of the excitation spectrum and enhancement of the luminescence performance of Mn 2+ -doped phosphors is provided in this work. Blue-green dual-narrow-emission phosphor with excellent luminescent properties is obtained through doping Eu 2+ into green RbAl 11 O 17 :Mn 2+ , which provides different insights into the development of phosphors for human-centric backlights.