We have demonstrated amplified spontaneous emission (ASE) characteristics of binary blends with green and red laser dyes and ternary blends with three primary color laser dyes. The results show that the stimulated emission rate of donor can be balanced with the Förster resonance energy transfer from the donor to the acceptor by adjusting the doping concentration of donor or acceptor dye, leading to the realization of the multi-wavelength ASE. The binary blend emission is at 493 and 570 nm with threshold at 15.7 and 19.1 μJ/cm2, respectively, while the ternary blend emission is at 452, 510, and 596 nm with threshold at 22.0, 18.6, and 23.8 μJ/cm2, respectively.

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