An organic light emitting display device including a red light emitting cell, a green light emitting cell, and a blue light emitting cell on a substrate, each of the red light emitting cell, the green light emitting cell, and the blue light emitting cell comprising: a first electrode formed on the substrate and being a reflective electrode; a second electrode facing the first electrode and being a semi-transparent electrode; and red, green and blue emission layers formed respectively in the red light emitting cell, the green light emitting cell, and the blue light emitting cell between the first and second electrodes (102; 104), wherein a maximum photoluminescence peak of a red host is between 450 and 485 nm, a maximum photoluminescence peak of a green host is between 450 and 530 nm, and a maximum photoluminescence peak of a blue host is between 400 and 435 nm, wherein a maximum electroluminescent peak of each of the red, green and blue emission layers and the maximum photoluminescence peak of a host included in each emission layer satisfy Equations 1 to 3 below: RED ELλmax − RH PLλmax ≥ 120 nm wherein RED ELλmax is a maximum electroluminescent peak of the red emission layer, and RH PLλmax is the maximum photoluminescence peak of the red host included in the red emission layer, Green ELλmax − GH PLλmax ≥ 20 nm wherein GREEN ELλmax is a maximum electroluminescent peak of the green emission layer, and GH PLλmax is the maximum photoluminescence peak of the green host included in the green emission layer, and BLUE ELλmax − BH PLλmax ≥ 20 nm wherein BLUE ELλmax is a maximum electroluminescent peak of the blue emission layer, and BH PLλmax is the maximum photoluminescence peak of the blue host included in the blue emission layer, wherein the red host and the green host are composed of different materials, wherein the red host is composed of a material represented by any one of the following Formulae 1 to 2: wherein the green host is formed of a material represented by Formula 4 below, BCP series such as a compound represented by Formula 5 below, CBP series such as a compound represented by Formula 6 below, CDBP series, or a material represented by Formula 7 below: wherein R is H for DNA, R is Me (methyl) for MADN and R is t-butyl for TBADN, and wherein the blue host is formed of a material represented by Formula 8 below: wherein R is H for DNA, R is Me (methyl) for MADN and R is t-butyl for TBADN. a first electrode formed on the substrate and being a reflective electrode; a second electrode facing the first electrode and being a semi-transparent electrode; and red, green and blue emission layers formed respectively in the red light emitting cell, the green light emitting cell, and the blue light emitting cell between the first and second electrodes (102; 104), wherein a maximum photoluminescence peak of a red host is between 450 and 485 nm, a maximum photoluminescence peak of a green host is between 450 and 530 nm, and a maximum photoluminescence peak of a blue host is between 400 and 435 nm, wherein a maximum electroluminescent peak of each of the red, green and blue emission layers and the maximum photoluminescence peak of a host included in each emission layer satisfy Equations 1 to 3 below: RED ELλmax − RH PLλmax ≥ 120 nm wherein RED ELλmax is a maximum electroluminescent peak of the red emission layer, and RH PLλmax is the maximum photoluminescence peak of the red host included in the red emission layer, Green ELλmax − GH PLλmax ≥ 20 nm wherein GREEN ELλmax is a maximum electroluminescent peak of the green emission layer, and GH PLλmax is the maximum photoluminescence peak of the green host included in the green emission layer, and BLUE ELλmax − BH PLλmax ≥ 20 nm wherein BLUE ELλmax is a maximum electroluminescent peak of the blue emission layer, and BH PLλmax is the maximum photoluminescence peak of the blue host included in the blue emission layer, wherein the red host and the green host are composed of different materials, wherein the red host is composed of a material represented by any one of the following Formulae 1 to 2: wherein the green host is formed of a material represented by Formula 4 below, BCP series such as a compound represented by Formula 5 below, CBP series such as a compound represented by Formula 6 below, CDBP series, or a material represented by Formula 7 below: wherein R is H for DNA, R is Me (methyl) for MADN and R is t-butyl for TBADN, and wherein the blue host is formed of a material represented by Formula 8 below: wherein R is H for DNA, R is Me (methyl) for MADN and R is t-butyl for TBADN.