| 摘要 |
This lighting apparatus is provided with a blue LED chip having a maximum peak at a wavelength of 420-480 nm and a fluorescent material-containing resin layer disposed on the front of the blue LED chip in the light emission direction. The fluorescent material-containing resin layer is obtained by mixing and dispersing a LuAg fluorescent material, which is represented by the formula Lu3Al5O12:Ce3+ and in which the Ce activation rate is 2 mol.% or lower relative to Lu, and a double fluoride fluorescent material represented by the formula A2(B1-xMnx)F6 (in the formula, A is at least one type of element selected from among the group consisting of Li, Na, K and Cs, B is at least one type of element selected from among the group consisting of Si, Ti, Nb, Ge and Sn, and x is an integer that falls within the range 0.001 ≤ x ≤ 0.1) in a resin. The present invention is capable of achieving a higher sense of brightness, high visibility and a sense of brightness across a wide range under scotopic conditions or mesopic conditions with an emitted light color close to black body radiation. |
