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The luminescence properties of yellow‐emitting Ce3+‐doped Sr‐containing sialon phosphor Sr(Al,Si)5(O,N)7:Ce3+ were notably improved by the Ce raw material selection. By changing the Ce raw material from oxides to nitrides or chlorides, the emission wavelength shifted to above 560 nm, which is beneficial for higher color rendering index white light‐emitting diodes. This result from an increase in the...