| 摘要 |
PURPOSE: To obtain an infrared-excitable phosphor which emits a green fluorescence of excellent visual recognizability when excited with infrared light at a wavelength of 1.3μm by adding specified ions to gadolinium bromide as the matrix. CONSTITUTION: This phosphor contains gadolinium bromide as the matrix, contains erbium ions as a source of light emission, contains dysprosium ions as a source of light absorption and fluoresces when excited with ultraviolet light at a wavelength of 1.3μm. Desirably, it comprises at least 70mol% gadolinium bromide, 1-20mol% erbium bromide and 1-10mol% dysprosium bromide and emits a green light. More desirably, it comprises at least 50mol% gadolinium bromide, 1-20mol% erbium bromide, 1-10mol% dysprosium bromide and the balance of at least one bromide selected from between barium bromide and potassium bromide.
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