Electron beam-excited blue phosphor

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Provided is an electron beam-excited blue phosphor, which is a rare earth-activated alkaline earth thiosilicate represented by a general formula M1xM22xSi2OyS6-yRaz where M1 and M2 each represent an alkaline earth metal, Ra represents a rare earth ion Ce3+ or Eu2+, and x, y, and z satisfy relationships of 0 ≤ x ≤ 2, 0 < y < 6, and z ≥ 0.005, respectively.