Patent ID: 7507485

Claim:
An organic electroluminescent device comprising: a first electrode; a second electrode; and a light-emitting layer having a guest material of a red luminescent material and first and second host materials formed between the first and second electrodes; wherein the first host material is an aromatic compound having one of the following structural formula; the second host material is a compound Alq 3 which has the following structural formula; and the guest material is a DCM Derivative which has the following structural formula; wherein the light emitting layer with the guest material and the first and second host materials enhances red luminescence efficiency of the device and has similar CIE coordinates of a red color in comparison with a red light emitting layer comprising the second host material alone with the guest material, wherein the first host material alone has a first PL peak value at a first wavelength, the second host material alone has a second PL luminescent peak value at a second wavelength, and the first and second host materials together have a third PL peak value at a third wavelength band between the first and second wavelengths.