A method for obtaining red emission from organic-light emitting diodes has been developed by dissolving red and green dyes in a common solvent and thermally evaporating the mixture in a single furnace. Devices with fundamental structure of ITO/PEDOT: PSS (55nm)/PVK (90nm)/Alq 3 : porphyrin (50nm)/Al (180nm) were fabricated. The emission properties and chromaticity coordinates of the devices depend on the energy transfer between the emission of host and the absorption of the dyes. TPP and TPPNO 2 doped in Alq 3 showed more pure red emission compared to 3,4-TPP, and PdTPP doped in Alq 3 based devices. AFM measurement showed that the morphology of the layers depends on the type of dyes and uniform mixing of porphyrin compounds and Alq 3 at constant deposition rate. It is shown that this new method is a promising candidate for fabrication of low cost red OLEDs at more homogeneous layer.