Thermal emission properties of Al2O3/Er3Al6O12 eutectic composite are studied for the application of selective emitter of thermophotovoltaic (TPV) power generator. Since this material has unique structure, high mechanical performance would be expected. Selective emission bands at wavelength 1.5μm due to Er3+ ions is observed. Since these emission bands match up the sensitive region of GaSb PV cell, Al2O3/Er3AlsO12 eutectic composite is a suitable emitter material for TPV systems. Solar TPV system with a dish-type solar concentrator (diameter= 1.56m) has been made and tested using the selective emitter material. The performance and component temperature are studied for the system equipped with broad band SiC and Al2O3/Er3Al5O12 eutectic composite selective emitters. Low thermal load for TPV optical components is confirmed for the selective emitter system. The improvement of fill factor of GaSb PV cells is also observed for selective emitter system.