To provide a phosphor with high quantum efficiency, and good temperature characteristics.
A phosphor comprises an inorganic compound having a composition including a metal element M, a trivalent element M1 different from the metal element M, a tetravalent element M2 different from the metal element M and either or both of O and N, where a part of the metal element M is replaced with an emission center element. A crystal structure of the phosphor has substantially the same crystal structure of Sr3Al3Si13O2N21, lengths of chemical bonds M1-N and M2-N are each within ±15% compared to lengths of Al-N and Si-N calculated from a lattice constant and atomic coordinate of Sr3Al3Si13O2N21. This phosphor exhibits an emission peak between wavelengths of 490 nm and 580 nm, when excited with a light of 250-500 nm wavelength.
ASAI HIRONORI
WO2007105631A1 | 2007-09-20 |
Yukitaka Nakamura
Noritaka Yokota
Hideaki Maekawa