Patent ID: 8143780

Claim:
An organic electroluminescent structure comprising: a first electrode having a blue light region, a green light region and a red light region; a blue color luminescent patterned layer disposed on the blue light region of the first electrode for generating a blue color light; a green color luminescent patterned layer disposed on the green light region of the first electrode adapted for generating a green color light; a red color luminescent-electron transport layer disposed on the red light region of the first electrode, the blue color luminescent patterned layer, and the green color luminescent patterned layer, the red color luminescent-electron transport layer being for generating a red color light in the red light region and transporting electrons to the blue color luminescent patterned layer in the blue light region and the green color luminescent patterned layer in the green light region, the red color luminescent-electron transport layer comprising a host and a dopant, a highest occupied molecular orbital (HOMO) energy level of the host being lower than or equal to an HOMO energy level of the blue color luminescent patterned layer and an HOMO energy level of the green color luminescent patterned layer, a lowest unoccupied molecular orbital (LUMO) energy level of the host being lower than or equal to an LUMO energy level of the blue color luminescent patterned layer and an LUMO energy level of the green color luminescent patterned layer, an HOMO energy level of the dopant being higher than or substantially equal to the HOMO energy level of the host, the HOMO energy level of the green color luminescent patterned layer, and the HOMO energy level of the blue color luminescent patterned layer, respectively, and an LUMO energy level of the dopant being lower than the LUMO energy level of the host, the LUMO energy level of the green color luminescent patterned layer, and the LUMO energy level of the blue color luminescent patterned layer, respectively; and a second electrode disposed on the red color luminescent-electron transport layer.