Uncommon photoluminescence (PL) with fine structure from amorphous indium zinc oxide (IZO) without and with silver (Ag) nano-particles embedment is observed. Significant enhancement in light emission is found for the sample when the embedded Ag nominal layer thickness is increased to 2 nm. The amorphous IZO (a-IZO) samples with and without Ag layer embedment exhibit two-peak PL at ~398nm (~3.12eV, violet light) and ~450nm (~2.76 eV, deep blue light), originating from the optical gap emission and the radiative recombination at the defect level. Interestingly, the intensity of the peak at ~398nm does not show any obvious change while the intensity of the deep blue light emission at ~450nm is significantly increased first and then decreased with the increment of Ag embedment. The unexpectedly enhanced PL at 450nm from IZO with a small amount of Ag embedment is attributed to the coupling between excited electron-hole pairs in IZO films and the surface plasmon of Ag particles. A careful analysis and discussion reveals an interesting mechanism of a-IZO and Ag interaction.