| 摘要 |
PURPOSE: An invisible luminescence material is provided to have excellent sensitivity, have excellent compatibility, and be used as a security item to prevent forgery. CONSTITUTION: An invisible luminescence material includes a host containing one or more materials selected from gadolinium borate and yttrium borate; and an activator including cerium, ytterbium, and terbium. A manufacturing method of the invisible luminescence material comprises a step of mixing a host precursor containing one or more materials selected from a gadolinium compound and an yttrium compound, an activator precursor containing a cerium compound, an yttrium compound, a terbium compound, and a boric acid; and a step of heat-treating the mixed raw material. [Reference numerals] (AA) Example 10; (BB) Example 8; (CC) Example 9
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