All single phase regions (compounds and solid solutions) in the system were activated with 0.01 mole percent (m/o) Ce 3+ (with equimolar amounts of Li + , Na + , or K + added to compensate charges) and the resulting ultraviolet excitation and emission spectra were characterized. Brightest phosphors were obtained from the solid solution phases in the and systems at the approximate compositions of , K + and , Li + , respectively. All phosphors exhibit a peak emission wavelength at approximately 390 nm with slight variations resulting from compositional changes.
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Kelsey et al. (1976) studied this question.