HALOPHOSPHATE PHOSPHOR AND WHITE LIGHT EMITTING DEVICE

摘要

Disclosed are: a blue (blue green) phosphor which has sufficient luminous intensity in a wavelength range around 490 nm, while having high luminance in a temperature range that is reached during the operation of an LED; and a white light emitting device which uses a high luminance green phosphor having an emission peak wavelength of not less than 535 nm, and which has improved reproducibility of a bright blue color. Specifically disclosed is a phosphor which is characterized by having a chemical composition represented by general formula (1). The phosphor has sufficient luminous intensity in a wavelength range around 490 nm, and a white light emitting device which uses the phosphor has improved reproducibility of a bright blue color. (Sr, Ca)aBabEux(PO4)cXd (1) (In general formula (1), X represents Cl; c, d and x respectively represent numbers satisfying 2.7 = c = 3.3, 0.9 = d = 1.1 and 0.3 = x = 1.2; and a and b satisfy the following conditions, a + b = 5- x and 0.05 = b/(a + b) = 0.6.)