Narrow Bandwidth Luminescence in Sr2Li(Al,Ga)O4:Eu2+ by Selective Site Occupancy Engineering for High Definition Displays

作者：Qiao, Jianwei; Zhou, Yayun; Molokeev, Maxim S.; Zhang, Qinyuan; Xia, Zhiguo^*

来源：Laser & Photonics Reviews, 2021, 15(11): 2100392.

DOI：10.1002/lpor.202100392

• chemical substitution
• green-emitting phosphor
• narrow-band emission
• site engineering

It remains a critical challenge to develop narrow-band emitters for wide color gamut displays. Herein, it is designed by the selective site occupancy engineering and an unprecedented narrow-band green-emitting phosphor is prepared through chemical substitution. By introducing Ga3+ ions into Sr2LiAlO4:Eu2+ phosphor, the distribution of Eu2+ ions in Sr1 and Sr2 sites is effectively controlled, and only one type of luminescent centers Eu-(Sr1)(2+) is remained in Sr2LiAl0.6Ga0.4O4:Eu2+ due to the compression effect of Sr2O(8) polyhedra. Sr2LiAl0.6Ga0.4O4:Eu2+ phosphor presents an extremely narrow-band green emission centered at 512 nm with a full-width at half-maximum of only 40 nm. The wide color gamut (107% National Television System Committee) of the as-fabricated white liquid crystal displays and the vivid figures captured from the projector demonstrate the potential application of narrow-band emitter for wide-color gamut displays. This work provides the design principles of realizing narrow-band emission by selective site occupancy engineering and can set the stage for the exploring of Eu2+-activated phosphor for high definition displays.