Sol–Gel Synthesis of Red-Emitting Phosphor Ca–Sr–Mo–W–O–(Eu³⁺,La³⁺) Powders and Luminescence Properties

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The object of this study is to synthesize (Ca0.6,Sr0.16)(Mo0.4,W0.6):Eu3+0.08,La3+0.08 by sol–gel technology. The results show that the dominant emission peak of phosphor is 5D0 → 7F2 (616 nm). The International Commission on Illumination (CIE) chromaticity coordinates of the red-emitting phosphor are (0.67, 0.33), which is the NTSC system standard for red chromaticity. Because there are two regions in the excitation spectra of the phosphor, one is assigned from the charge transfer state (CTS) band at about 200–350 nm, and the other is from the intra-4f transitions from 350 to 600 nm. Hence, the phosphors could be strongly excited by near-UV and blue LEDs in solid state lighting technology. X-ray diffraction patterns indicated that red-phosphor powders present a tetragonal structure, I41/a[88](Z = 4) space group.