Research on Photoluminescence of Emerging Dual Narrow-Band Emission Phosphor for LCD Backlight
This paper started from the UCr4C4 mineral model and designed a blue-green dual narrowband emission phosphorto replace the traditional monochromatic narrowband emission phosphorused for backlight sources by changing the local environment of Eu2+through cation substitution.selected RbNa3(Li3SiO4)4 with a space group of I4/m as the starting matrix for evolution,and successfully prepared a series of tunable Rb1+xNa2.97-x(Li3SiO4)4∶3%Eu2+(0.1～x～2.5)phosphors with emission colors ranging from blue blue-green dual narrowband to green using high-temperature solid-phase method by continuously replacing Na+with Rb+.The sample with x=0.7 exhibits rare blue-green dual narrowband emission,with emission peaks located at 472 nm(full width at half maximum=21nm)and 522 nm(full width at half maximum=48 nm),respectively.The reason for the dual narrowband emission of the intermediate phase sample is elucidated through the steady-state and transient spectra of the sample.All results indi-cate that the dual narrow-band emitting phosphor has great potential in improving LED packaging,enhancing device stability,simplifying preparation processes,and reducing production costs.
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