The spectroscopic properties of CMW: Bi3 + phosphor are explained on the basis of the Bi3 + (6s2) - W6 + (5d0 metal-to-metal.) Charge transfer (MMCT) transition. CMW: Bi3 + Phosphor with excitation 338 nm shows yellow light and the chromaticity coordinate. Is, (0.383 0.477). Broad emission band peaking at ~ 550 nm of CMW: Bi3 + phosphor is observed in the range of 400 - 780 nm due. To the D - > 1S0 radiative decay and, the 3P1 0 - > 1S0 transitions of Bi3 + ion. Monitored at 550 nm excitation spectrum, of. CMW: Bi3 + Phosphor including a strong excitation peak at ~ 338 nm covers the region from 200 to 400 nm owing to the Bi3 + - > W6 + MMCT transition and the 1S0 - > 3P1 transition of Bi3 + ion. The optimal Bi3 + ion actual content is ~ 0.38 mol%. Emission. Spectra of CMW: Bi3 + Phosphor with excitation 338 nm shows blue-shift with increasing temperature from 50 to 300 K owing. To the influence of temperature to electron transfer. The possible luminous mechanism of CMW: Bi3 + phosphor is analyzed by. Energy level diagram of Bi3 + ion in solid including d0 cation.
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