Light emitting device, light emitting device package and lighting system
Disclosed are a light emitting device, a light emitting device package, and a lighting system. The light emitting device includes an oxide including gallium aluminum over a gallium oxide substrate, a nitride including gallium aluminum over the oxide including gallium aluminum, and a light emitting structure over the nitride including gallium aluminum.
1. A light emitting device comprising:
an oxide including gallium aluminum over a gallium oxide substrate;
a nitride including gallium aluminum over the oxide including gallium aluminum; and
a light emitting structure over the nitride including gallium aluminum.
2. The light emitting device of claim 1 , wherein the oxide including gallium aluminum comprises Ga x Al y O z (0<x≦1, 0<y≦1, 0<z≦1).
3. The light emitting device of claim 1 , wherein the oxide including gallium aluminum has a thickness of 1 or less.
4. The light emitting device of claim 1 , wherein the nitride including gallium aluminum comprises Ga x Al y N z (0<x≦1, 0<y≦1, 0<z≦1).
5. The light emitting device of claim 1 , wherein the light emitting structure comprises:
a second conductive semiconductor layer over the nitride including gallium aluminum;
an active layer over the second conductive semiconductor layer; and
a first conductive semiconductor layer over the active layer.
6. A light emitting device package comprising:
a package body;
third and fourth electrode layers over the package body; and
a light emitting device claimed in claim 1 and electrically connected to the third and fourth electrode layers.
7. A lighting system comprising:
a substrate; and
a light emitting module including a light emitting device package over the substrate,
wherein the light emitting device package comprises a package body, third and fourth electrode layers over the package body, and a lighting emitting device claimed in claim 1 and electrically connected to the third and fourth electrode layers.