Phosphor and its production process
AssigneesKasei Optonix, Ltd., Mitsubishi Chemical Corporation
InventorsNaoto Kijima, Yasuo Shimomura
Life of this patent
Estimating the term…
Abstract
The present invention is to provide a phosphor of minimum particle size having an excellent crystallinity and a high brightness higher than conventional crude particles, which is usable for a highly precise display, a highly bright illuminating element or illuminating apparatus, a high speed immunoassay system or the like, i.e. a phosphor having a substantially spherical outer shape, which comprises primary particles having a median diameter D50 in a range of from 0.05 μm to 1 μm and secondary particles having a median diameter D50 in a range of from 0.1 μm to 2 μm, wherein at least 50 vol % of the total secondary particles has an aspect ratio of at least 0.8 and an internal quantum efficiency is in a range of from 0.8 to 1.
Claims15
A phosphor having a substantially spherical outer shape, which comprises:
- primary particles having a median diameter D50 in a range of from 0.05 μm to 1 μm and
- secondary particles having a median diameter D50 in a range of from 0.1 μm to 2 μm, wherein at least 50 vol % of the total secondary particles has an aspect ratio of at least 0.8
- and an internal quantum efficiency is in a range of from 0.8 to 1,
- wherein a matrix crystal of the phosphor contains at least one element selected from the group consisting of Li, Na, F and Cl in an amount ranging from 0.1 to 100 ppm.
Dependencies are inferred from the claim text.