LUMINESCENT POWDER, METHOD FOR PRODUCING SAME, LUMINESCENT ELEMENT WHEREIN LUMINESCENT POWDER IS USED, METHOD FOR PRODUCING SAID LUMINESCENT ELEMENT, AND APPARATUS FOR PRODUCING LUMINESCENT POWDER

摘要

Luminescent powder (10) is produced with a first process wherein single-crystal silicon is maintained in a super-critical fluid comprising carbon dioxide and a second process wherein laser light, having an intensity which gives rise to laser ablation where nano-size silicon crystals are dispersed from the single-crystal silicon into the super-critical fluid, is directed onto the single-crystal silicon.  As a result the luminescent powder (10) comprises crystalline silicon (1) which has a spherical form, with silicon oxide (2) covering the outside of the crystalline silicon (1).  The diameter of the crystalline silicon (1) is about 2 nm and the thickness of the silicon oxide (2) is about 2 nm.  Hence, the luminescent powder (10) has a spherical form of diameter about 6 nm.