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Emission of Zn 2 SiO 4 :Mn 2+ can be readily controlled to have continuously variable colors between green and yellow by adjusting the pH of the starting solutions in supercritical water syntheses. Mostly single phase β-Zn 2 SiO 4 :Mn 2+ exhibiting yellow emission was formed at a pH of 10.5. By changing pH of the starting solution from low values (ca...
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