New upconversion phosphors of Sr3AlO4F:Yb3+,Er3+,Ho3+ were developed.
Tunable emission has been obtained in the Sr3AlO4F:5%Yb3+,xEr3+,yHo3+ phosphors.
Sr3AlO4F:Yb3+,Er3+ shows a red emission peak and the green one is almost quenched.
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