Excitation spectrum of zinc silicate phosphor showed two bands. A major band is located between 2250A and 2900A, and a minor one between 1950A and 2250A. Absorption measurements of clear willemite crystals showed two similar bands located at about the same positions. Absorption measurements for zinc silicate phosphor showed a band located between 2000A and 3000A. These results indicate that the excitation spectrum of a phosphor also measures the absorption of that phosphor.
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