Ce3+-doped SrS phosphors with a charge-compensating
Na+ addition were successfully synthesized via a solid-state
reaction method, and the related X-ray diffraction patterns can be
indexed to the rock-salt-like crystal structure of the Fm3̅m space group. SrS:(Ce3+)
x
(0.005 ≤ x ≤
0.05) and SrS:(Ce3+)0.01,(Na+)
y
(0.005 ≤ y ≤
0.030) phosphors were excited by 430 nm UV-Vis light, targeted to
the 5d1 → 4f1 transition of Ce3+. The composition-optimized SrS:(Ce3+)0.01,
(Na+)0.015 phosphors showed an intense broad
emission band at λ = 430–700 nm. The doping of Na+ was probed by solid-state nuclear magnetic resonance. The
430 nm pumped white light-emitting diode structure fabricated with
a combination of SrS:(Ce3+)0.01,(Na+)0.015 and Sr2Si5N8:Eu2+ phosphors shows a color-rendering index (R
a) of 89.7. The proposed strategy provides new avenues
for the design and realization of novel high color quality solid-state
LEDs.
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