A novel MOLED was fabricated using mixed organic materials as lightemitting layer.By changing their weight ratio (from 1∶28 to 17∶1) the cavity were modulated subtly,which convinced us that by changing their weight ratio reasonably the color altering can be realized.Two modes can be clearly observed in five different weight ratio microcavity and their full width at half maximum (FWHM) are 8 nm and 12 nm respectively.In addition,we fabricated a conventional microcavity device and found that the relationship...