Disclosed herein is a light emitting device, which includes a first substrate, a protective layer, a second substrate, a buffer member and a sealant. The first substrate has an illuminating member thereon. The protective layer covers the illuminating member and has a first coefficient of thermal expansion. The second substrate is disposed over the protective layer. The buffer member is disposed between the first and second substrates and surrounds the protective layer, wherein the buffer member has a second coefficient of thermal expansion which is less than the first coefficient. The sealant surrounds the buffer member and seals off the space between the first and second substrates, wherein the sealant has a third coefficient of thermal expansion which is less than the second coefficient.