High Efficiency and Narrow‐Band Green Emission in Eu2+ and Mn2+ Co‐Doped Na2MgAl10O17 Phosphor for Backlight Display Application

ABSTRACT Wide color gamut display has become a new generation of display technology because of its good color saturation. However, the low quantum efficiency and wide half peak width of narrow‐band green phosphors are still the main barriers in their development and application. This work addresses these challenges by using Mn 2+ as the luminescent center and constructing efficient Eu 2+ → Mn 2+ energy transfer in Na 2 MgAl 10 O 17 (NMAO) matrix. The NMAO:0.15Eu 2+ , 0.30Mn 2+ phosphor presents a single‐band emission peaking at 513 nm with a full width at half maximum (FWHM) of only 33 nm under the excitation of 365 nm LED chip. In addition, under the excitation wavelength of 365 nm, the energy transfer efficiency reaches 74%. Compared with the NMAO:0.30Mn 2+ , the intensity of the NMAO:0.15Eu 2+ , 0.30Mn 2+ increases by 5.5 times and the internal quantum efficiency is up to 61.82%. A white LED device with the CIE coordinates of (0.2871, 0.3472) and a color gamut area of 94% NTSC has been assembled successfully by combining 365 nm LED chips with NMAO:0.15Eu 2+ , 0.30Mn 2+ , BaMgAl 10 O 17 :Eu 2+ , and K 2 SiF 6 :Mn 4+ as green, blue, and red component. This work enriches the relevant content of Mn 2+ ‐doped phosphors and provides a constructive insight into improving luminescent performance through energy transfer.