An organic electroluminescent device comprising: first and second electrodes facing each other on a substrate ; first and second emission layers formed between the first and second electrodes ; a hole transport layer formed between the first electrode and the first emission layer ; an electron transport layer formed between the second electrode and the second emission layer ; at least one emission control layer formed between the first and second emission layers , wherein the emission control layer comprises a first emission control layer (ECL1) and a second emission control layer (ECL2), wherein the first emission laver is between the hole transport laver and the emission control laver and the first emission control laver (ECL1) is between the first emission laver and the second emission control laver (ECL2), wherein the second emission control layer (ECL2) has a lowest unoccupied molecular orbital (LUMO) energy level that is higher than that of the first and second emission layers and the first emission control laver (ECL1) has a highest occupied molecular orbital (HOMO) energy level that is lower than that of the first and second emission layers ; and wherein the first emission control layer (ECL1) has higher electron mobility than hole mobility, and the second emission control layer (ECL2) has higher hole mobility than electron mobility, characterized in that each of the first and second emission layers comprises a luminescent host and a luminescent dopant, wherein the luminescent hosts of the first and second emission layers are formed of different materials, and the luminescent dopant of the first emission layer has a lower doping concentration than the luminescent dopant of the second emission layer , wherein the luminescent host of the first emission layer has a higher hole mobility than the luminescent host of the second emission layer . first and second electrodes facing each other on a substrate ; first and second emission layers formed between the first and second electrodes ; a hole transport layer formed between the first electrode and the first emission layer ; an electron transport layer formed between the second electrode and the second emission layer ; at least one emission control layer formed between the first and second emission layers , wherein the emission control layer comprises a first emission control layer (ECL1) and a second emission control layer (ECL2), wherein the first emission laver is between the hole transport laver and the emission control laver and the first emission control laver (ECL1) is between the first emission laver and the second emission control laver (ECL2), wherein the second emission control layer (ECL2) has a lowest unoccupied molecular orbital (LUMO) energy level that is higher than that of the first and second emission layers and the first emission control laver (ECL1) has a highest occupied molecular orbital (HOMO) energy level that is lower than that of the first and second emission layers ; and wherein the first emission control layer (ECL1) has higher electron mobility than hole mobility, and the second emission control layer (ECL2) has higher hole mobility than electron mobility, characterized in that each of the first and second emission layers comprises a luminescent host and a luminescent dopant, wherein the luminescent hosts of the first and second emission layers are formed of different materials, and the luminescent dopant of the first emission layer has a lower doping concentration than the luminescent dopant of the second emission layer , wherein the luminescent host of the first emission layer has a higher hole mobility than the luminescent host of the second emission layer . <EOS>