Abstract: A cooling apparatus may include an electric water pump to pump coolant, a coolant channel in fluid communication with a cooling target and the electric water pump, and a thermoelectric device including a higher-temperature part and a lower-temperature part. The thermoelectric device may cool the coolant flowing into the coolant channel. The cooling apparatus may include a first heat sink disposed adjacent to the higher-temperature part, a second heat sink disposed adjacent to the coolant channel, and a cooling fan provided adjacent to the first heat sink. The cooling apparatus may include an air duct forming a first fluid line where air passes through only the first heat sink and is then discharged by operation of the cooling fan and forming a second fluid line where air passes through the first heat sink and the second heat sink and is then discharged by the operation of the cooling fan.

Abstract: A semiconductor light emitting device includes a Group-III nitride semiconductor layer on a buffer layer. The buffer layer includes a first layer, a second layer, and a third layer in that order. Each of the first layer, the second layer, and the third layer includes a composition which includes aluminum (Al), nitrogen (N), and oxygen (O). A minimum or average value of an oxygen concentration (atoms/cm3) of each of the first layer and the third layer is greater than an oxygen concentration (atoms/cm3) of the second layer.