Patent ID: 7535162
Filing Date: 2009-05-19
Classification: C09K,Y10T

Abstract:
1. A zinc oxide phosphor comprising: zinc oxide; at least one of aluminum, gallium, and indium doped to said zinc oxide; and at least one of lithium and sodium doped to said zinc oxide, wherein a surface layer containing solid-soluted hydrogen is formed at a hydrogen concentration controlled so as to inactivate defects formed in the phosphor to contribute to non-radiative transition and not to inactivate defects contributing to radiative transition, or hydrogen is contained at a concentration controlled so as to inactivate defects formed in the phosphor to contribute to non-radiative transition over the entire region of a grain of the phosphor and not to inactivate defects contributing to radiative transition, and wherein when the phosphor is excited with ultraviolet rays or electromagnetic waves or electron rays at a shorter wavelength than that of ultraviolet rays, the maximum intensity of an emission spectrum at room temperature is observed in a wavelength range of 550 to 650 nm, and the spectrum is a continuous spectrum extending from 400 nm or less at the short-wavelength tail and to 800 nm or more at the long-wavelength tail.