Calcium Vacancy Generated Luminescence Improvement of the Ca₃Sc₂Si₃O₁₂:Ce³⁺ Phosphor for WLED

Phosphors with high efficiency and excellent thermal stability for solid‐state lighting have kept catching researchers' attention. Herein, a series of Ca 3 Sc 2 Si 3 O 12 :Ce 3+ cyan‐emitting phosphors are synthesized, and calcium vacancy is introduced into the lattice to improve emission and thermal stability. Detailed structure information is studied via X‐ray diffraction and X‐ray photoelectron spectroscopy to obtain the effect of Ca vacancy on the lattice structure. Absorption spectra and photoluminescence spectra of the phosphors are measured to confirm the enhanced emission of Ca 3 Sc 2 Si 3 O 12 :Ce 3+ phosphors via Ca vacancy engineering. Optimized phosphor Ca 2.59 Ce 0.01 Sc 2 Si 3 O 12 exhibits high quantum efficiency (89.4%) and maintains 84.6% of its room‐temperature emission intensity at 423 K. Optimized phosphor Ca 2.59 Ce 0.01 Sc 2 Si 3 O 12 is mixed with orange phosphor to fabricate white light‐emitting diode (WLED) with blue chip. All the information confirms the promising application prospects of this cyan‐emitting phosphor in high‐quality WLED.